• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Process for manufacturing an aluminum alloy part by additive manufacturing comprising a step during which a layer of a mixture of powders is locally melted and then solidified, characterized in that the mixture of powders comprises: - first particles (10) comprising at least 80% by weight of aluminum and up to 20% by weight of one or more additional elements, and - second particles (20) of yttriated zirconia, the mixture of powders comprising at least 1.5% volume of second particles. Figure for the abstract: Figure 5B.
    公开号:FR3096056A1
    申请号:FR1904935
    申请日:2019-05-13
    公开日:2020-11-20
    发明作者:Mathieu OPPRECHT；Jean-Paul Garandet；Guilhem Roux
    申请人:Commissariat a lEnergie Atomique CEA；Commissariat a lEnergie Atomique et aux Energies Alternatives CEA；
    IPC主号:
    专利说明:

    [0001] The present invention relates to the general field of the manufacture of aluminum alloy parts by additive manufacturing.
    [0002] The invention relates to a process for manufacturing aluminum alloy parts from a powder mixture containing aluminum-based particles and yttria-zirconia particles.
    [0003] The invention also relates to an aluminum alloy part obtained with this process.
    [0004] The invention is particularly interesting since it makes it possible to remedy the problems of hot cracking of aluminum alloys in additive manufacturing processes involving melting.
    [0005] The invention finds applications in many industrial fields, and in particular in the fields of the automobile, aeronautics, energy (for example, for the manufacture of heat exchangers) or even in the case of reinforcement structural by the untransformed particles.
    [0006] The different processes for manufacturing metal alloy parts by additive manufacturing (also called 3D printing) have in common that they use the raw material in the form of powders and shape the metal alloy via a step of melting these powders .
    [0007] The various additive manufacturing processes concerned include, in particular, powder bed fusion processes (or PBF for "Powder Bed Fusion" in Anglo-Saxon terminology) and material deposition processes under concentrated energy (or DED for " Directed Energy Deposition” in Anglo-Saxon terminology).
    [0008] PBF processes consist of melting certain regions of a powder bed, for example by means of a laser beam. DED processes consist of bringing the solid material, for example in the form of wire or powder, to melt it, for example by means of a laser beam, and to deposit the molten material.
    [0009] With such processes, it is possible to industrially produce parts, of simple or complex shape, having satisfactory mechanical properties.
    [0010] However, some aluminum alloys are subject to hot cracking problems resulting from columnar dendritic solidification, causing a microstructure sensitive to thermomechanical stresses during solidification, especially for a solid fraction ranging from 0.9 at 0.98.
    [0011] To overcome this drawback, various solutions have been considered.
    [0012] For example, it is possible to modify the chemical composition of the alloy of the powder, by using, in particular, Scamalloy. It is a light alloy comprising aluminium, magnesium and scandium, developed specifically for additive manufacturing. During solidification, primary Al 3 Sc particles precipitate from the liquid and act as seeds for the grain growth of the Al matrix. Scandium therefore allows a refinement of the microstructure and the development of an equiaxed dendritic solidification . However, Scandium is a particularly expensive element, which considerably increases the costs of the raw material.
    [0013] Another solution is to add nanoparticles of a so-called germinating material, cheaper than scandium, to the aluminum powder to promote equiaxed solidification.
    [0014] In document WO 2018/144323 A1, aluminum alloy powders are mixed with nanoparticles of Zr, Ta, Nb, Ti or even one of their oxides, nitrides, hydrides, borides, carbides and aluminides to manufacture parts aluminum alloy by additive manufacturing. Among the various embodiments described, parts are manufactured by selective laser melting (also denoted SLM) from, for example, a mixture comprising: - aluminum and tantalum nanoparticles 50 nm in diameter (1% by volume), or - an aluminum alloy (Al7075 or Al6061) and zirconium nanoparticles 500-1500nm in diameter (1% by volume).
    [0015] In the article by Zhang et al. (“Effect of Zirconium addition on crack, microstructure and mechanical behavior of selective laser melted Al-Cu-Mg alloy”, Scripta Materialia 134 (2017), 6–10), the grain refinement of an aluminum alloy Al- Cu-Mg is made by adding 2% by weight of zirconium particles with an average size of 8.8µm.
    [0016] In the article by Martin et al. (“3D printing of high-strength aluminum alloys”, Nature 549 (2017), pages 365–369), powders of aluminum alloys of series 7075 (bimodal distribution at 15µm and 45µm) and 6061 (d 50 of 45µm ) were mixed with 1% by volume of Zirconium nanoparticles stabilized with hydrogen (ZrH 2 ) to remedy the problem of hot cracking of aluminum alloys obtained by SLM. The nanoparticles are electrostatically assembled on the base powder to obtain a uniform distribution. No information is given on the particle size of the nanoparticles used.
    [0017] An object of the present invention is to provide a process for manufacturing aluminum alloy parts that do not exhibit cracks, the process having to be simple to implement and inexpensive.
    [0018] For this, the present invention proposes a process for manufacturing an aluminum alloy part by additive manufacturing comprising at least one step during which a layer of a mixture of powders is melted and then solidified,
    [0019] the mixture of powders comprising: - first particles comprising at least 80% by mass of aluminum and up to 20% by mass of one or more additional elements, and - second yttria zirconia particles,
    [0020] the mixture of powders comprising at least 1.5% by volume of second particles.
    [0021] The invention differs fundamentally from the prior art by the addition of particles of yttria zirconia (ZrO 2 -Y 2 O 3 more commonly called YSZ) to the aluminum-based powder. The addition of such particles makes it possible to promote an equiaxed solidification structure and thus eliminate cracking in the final part.
    [0022] En effet, même si la zircone (ZrO2) et l’yttrine (Y2O3) semblent plus stables thermodynamiquement que l’alumine quelle que soit la température (voir les diagrammes d’Ellingham représentés sur les figures 1A et 1B, obtenus à partir des données extraites des articles de Shen [1] et de Chu et al. [2] référencés à la fin de la description), il a été observé que, au cours du procédé de fabrication additive, on forme la phase germinante Al3Zr par décomposition de la zircone yttriée.Against all expectation, yttria zirconia gives rise to germinating particles of Al 3 Zr by reaction with aluminum according to the following reactions: [Math 1]Indeed, even if zirconia (ZrO 2 ) and yttria (Y 2 O 3 ) seem more thermodynamically stable than alumina whatever the temperature (see the Ellingham diagrams represented in FIGS. 1A and 1B, obtained from the data extracted from the articles of Shen [1] and Chu et al [2] referenced at the end of the description), it was observed that, during the additive manufacturing process, the germinating phase Al is formed 3 Zr by decomposition of yttria-zirconia.
    [0023] It did not seem obvious that this Al 3 Zr phase (2nd reaction) had time to germinate since the lifetimes of the molten metal baths, formed during the process, are relatively short (from a hundred microseconds to a millisecond) . At first sight, this in-situ reaction is neither thermodynamically nor kinetically favored by the thermal conditions imposed by the process.
    [0024] Advantageously, yttria zirconia is a stable oxide, easy to handle and/or to store, compared to metallic elements known to be highly reducing.
    [0025] Advantageously, the second particles have a larger dimension ranging from 5 nm to 600 nm, preferably from 100 nm to 400 nm, and even more preferably from 200 nm to 300 nm.
    [0026] Advantageously, the percentage by volume of second particles (YSZ) in the mixture of powders ranges from 1.5% to 5% and even more preferentially from 1.5% to 2.5%.
    [0027] Advantageously, the first particles have a larger dimension ranging from 10 μm to 100 μm, and preferably from 20 μm to 65 μm.
    [0028] Advantageously, the additional elements are chosen from Cu, Si, Zn, Mg, Fe, Ti, Mn, Zr, Va, Ni, Pb, Bi and Cr.
    [0029] Advantageously, the aluminum alloy is alloy 7075, alloy 6061, alloy 2219 or alloy 2024.
    [0030] According to a first advantageous embodiment variant, the manufacturing process is a selective laser melting process.
    [0031] According to a second advantageous embodiment, the manufacturing process is a selective melting process by electron beam.
    [0032] Advantageously, the mixture of powders is produced in a 3D dynamic mixer or by mechanical synthesis.
    [0033] Advantageously, the specific surface of the mixture, after mixing with the 3D dynamic mixer, is greater than 0.3 m²/g.
    [0034] The process has many advantages: - be simple to implement, since it suffices to mix powders. This is a dry step, quick to perform and simple to set up, regardless of the quantity of powders; - be inexpensive, and therefore interesting from an industrial point of view. By way of illustration, the material cost of a 6061 aluminum alloy is approximately €60/kg and the material cost of a mixture of powders comprising the 6061 aluminum alloy and yttria-containing zirconia (1.5% volume) is approximately €61.71/kg; tantalum and ZrH 2 oxides are significantly more expensive than yttriated zirconia (at least 15 times more expensive); - be able to easily store/handle the yttria-containing zirconia powder, since it is an oxide: there is no need to use an inert atmosphere; - be able to easily modify the volume ratio between the powders when mixing the powder, - be easily adaptable for any additive manufacturing process and for any aluminum alloy subject to the problem of hot cracking, - be able to use the parameters conventionally used in additive manufacturing processes.
    [0035] The invention also relates to an aluminum alloy part, obtained according to the process described above, the part comprising yttria-containing zirconia. The part is free of cracks/cracks.
    [0036] Advantageously, the part is a heat exchanger.
    [0037] Other characteristics and advantages of the invention will emerge from the additional description which follows.
    [0038] It goes without saying that this additional description is only given by way of illustration of the object of the invention and should in no way be interpreted as a limitation of this object.
    [0039] The present invention will be better understood on reading the description of exemplary embodiments given purely for information and in no way limiting, with reference to the appended drawings in which:
    [0040] previously described, is an Ellingham diagram representing the stabilities of aluminum oxide (Al₂O₃) and zirconium oxide (ZrO₂),
    [0041] previously described, is an Ellingham diagram representing the stabilities of aluminum oxide (Al₂O₃) and yttrium oxide (Y₂O₃),
    [0042] schematically represents a mixture of powders according to a particular embodiment of the method of the invention,
    [0043]
    [0044]
    [0045]
    [0046] are images obtained under a scanning electron microscope (SEM) of aluminum particles and yttria-containing zirconia (YSZ) particles at different volume concentrations according to a particular embodiment of the invention,
    [0047] is a picture obtained under an optical microscope along the XY plane of a part made from particles of an aluminum alloy 6061,
    [0048]
    [0049]
    [0050]
    [0051] are snapshots obtained under an optical microscope along the XY plane of a part made from a mixture of particles of an aluminum alloy 6061 and particles of YSZ at different volume concentrations according to different embodiments of the invention,
    [0052]
    [0053] are electron backscattered diffraction (EBSD) images along the XZ plane of a part made from aluminum particles and of a part made, according to a particular embodiment of the invention, from a mixture of particles of an aluminum alloy 6061 and 2% by volume of YSZ particles,
    [0054]
    [0055] are images obtained with a backscattered scanning electron microscope, along the XY plane and along the XZ plane respectively, of a part made from a mixture of particles of an aluminum alloy 6061 and 2% by volume of YSZ particles, according to a particular embodiment of the invention,
    [0056] is a graph representing the specific surface of the mixture as a function of the volume percentage of YSZ, according to a particular embodiment of the invention.
    [0057] The different parts shown in the figures are not necessarily shown on a uniform scale, to make the figures more readable.
    [0058] The different possibilities (variants and embodiments) must be understood as not mutually exclusive and can be combined with each other.
    [0059] DETAILED DISCUSSION OF PARTICULAR EMBODIMENTS
    [0060] The process for manufacturing an aluminum alloy part by additive manufacturing comprises the following successive steps: a) providing a mixture of powders comprising, and preferably consisting of: - a first powder comprising first particles 10 made of a first material comprising at least 80% by weight of aluminum and up to 20% by weight of one or more additional elements, - a second powder comprising second particles 20 made of a second material, the second material being yttria-containing zirconia, b) forming a layer of the powder mixture, c) locally melting the layer of the mixture of powders, preferably by scanning a laser beam or by scanning an electron beam, so as to form a plurality of melted zones, d) cooling the plurality molten in step c) so as to form a plurality of solidified zones, this plurality of solidified zones constituting the first elements of the parts to be constructed.
    [0061] Advantageously, steps b), c) and d) can be repeated at least once so as to form at least one other solidified zone on the first solidified zone. The process is repeated until the final shape of the piece is obtained. The first layer of powder mixture is formed on a substrate.
    [0062] The addition of particles 20 of yttria-stabilized zirconia (or YSZ for “Yttria-Stabilized Zirconia”), to the first particles 10 of interest based on aluminium, makes it possible to obtain an equiaxed solidification structure and a final part made of an alloy of aluminum without cracking.
    [0063] Preferably, the first particles 10 are functionalized by the second particles 20 (FIG. 2).
    [0064] Preferably, the second particles 20 consist of yttria-containing zirconia.
    [0065] The yttria zirconia advantageously comprises from 1 to 10% by mass, and preferably from 3% to 10% by mass, of yttrium oxide. It may also contain small quantities (typically less than 3% by weight) of pollutants, conventionally encountered in the powder manufacturing processes, in particular oxides such as hafnium oxide, for example.
    [0066] The second yttria zirconia powder preferably represents at least 1.5% by volume of the mixture of powders, preferably from 1.5% to 5%, for example from 1.5% to 2.5%.
    [0067] According to an advantageous embodiment, the first particles 10 have a larger dimension ranging from 10 μm to 120 μm and the second particles 20 have a larger dimension ranging from 5 nm to 600 nm and, preferably, from 100 nm to 600 nm, even more preferably from 100nm to 400nm, and even more preferably from 200nm to 300nm.
    [0068] The first particles 10 and the second particles 20 are elements which can be of spherical, ovoid or elongated shape. Preferably, the particles are substantially spherical and their largest dimension is their diameter.
    [0069] The first powder is formed from first particles 10 of a first material. The first material comprises at least 80% by weight aluminum, and preferably at least 90% by weight aluminum.
    [0070] The first particles 10 can comprise up to 20% and preferably up to 10% by mass of one or more additional elements (also called alloying elements). These elements are preferably chosen from zinc, magnesium, copper, silicon, iron, manganese, titanium, vanadium, bismuth, lead, nickel, zirconium and chromium.
    [0071] Preferably, the alloy is a 7075 aluminum alloy, a 2024 alloy, a 2219 alloy or a 6061 aluminum alloy.
    [0072] The mixture of powders provided in step a) is produced upstream of the additive manufacturing process.
    [0073] In a preferred embodiment of the invention, the first powder and the second powder are mixed with the 3D dynamic mixer, for example with a Turbula® mixer. Alternatively, it could be a mechano-synthesis process.
    [0074] During step c), a sufficiently energetic beam is used to melt at least the first particles 10.
    [0075] The deposited layer can be locally melted or completely melted.
    [0076] The melting step creates melted patterns in the layer of the powder mixture. One or more areas of fused particles can be made to form the desired pattern. The particles 10 forming the pattern melt completely so as to lead, during solidification (step d), to one or more zones solidified in an aluminum alloy.
    [0077] Advantageously, steps b), c) and d) can be repeated at least once so as to form at least one other solidified zone on the first solidified zone. The process is repeated until the final shape of the piece is obtained.
    [0078] The unsolidified powders are then evacuated and the final part is detached from the substrate.
    [0079] The part obtained, according to one of these processes, can be subjected to an annealing step (heat treatment) to reduce the internal stresses and improve the mechanical properties.
    [0080] According to a first variant embodiment, it is a powder bed laser fusion (SLM) process. By way of illustration and not limitation, the parameters of the manufacturing process by laser fusion on a powder bed are: - between 50 and 500W for the laser power; - between 100 and 2000 mm/s for the laser speed; - between 25 and 120 μm for the distance between two vector spaces (“hatch” in Anglo-Saxon terminology); - between 15 and 60µm for the layer thickness.
    [0081] According to another embodiment variant, it is an electron beam melting process on a powder bed (EBM). By way of illustration and not limitation, the parameters of the manufacturing process by electron beam melting on a powder bed are: - between 50 and 3000W for the electron beam; - between 100 and 8000 mm/s for the speed of the beam; - between 50 and 150 µm for the distance between two vector spaces; - between 40 and 60µm for the layer thickness.
    [0082] The deposition machines used for additive manufacturing processes include, for example, a powder supply system (“powder delivery system”), a device for spreading and homogenizing the surface of the powder (“Roller”) or "Blade"), a beam (for example an infrared laser beam at a wavelength of approximately 1060nm), a scanner to direct the beam, and a substrate (also called plate) which can descend vertically (along a Z axis perpendicular to the powder bed).
    [0083] The assembly can be confined in a thermally closed and inerted enclosure, to control the atmosphere, but also to prevent the dissemination of powders.
    [0084] Although this is in no way limiting, the invention particularly finds applications in the field of energy, and more particularly, heat exchangers, in the field of aeronautics and in the field of automobiles.
    [0085] Illustrative and non-limiting examples of an embodiment
    [0086] In this example, cube-shaped parts with dimensions 10mm*10mm*10mm are manufactured by printing by SLM.
    [0087] The part is obtained from a mixture of two powders: an aluminum alloy powder and a YSZ powder.
    [0088] The particle size of the Aluminum alloy powder (Al6061) is as follows: d 10 =27.5 μm, d 50 =41.5 μm and d 90 =62.7 μm.
    [0089] Regarding the YSZ powder, its particle size is as follows: diameter from 120 nm to 600 nm. The powder is marketed by the company Innovnano Materials under the reference 2YSZ. It contains 3.5% by mass of Y 2 O 3 .
    [0090] The aluminum powder is baked at 180°C for 2 hours. Then the mixture of the two powders is carried out in a glove box from: 1200mL of the aluminum alloy powder to be refined, 24mL of the yttria-containing zirconia powder (mixture at 2% by volume), and 250mL of 3mm diameter zirconia, used to homogenize the mixture. The volume of the mixing pot is 6.5L.
    [0091] The filling rate, defined as the ratio of the volume represented by the particles 10, the particles 20 and the Zirconia beads to the volume of the mixing pot, is approximately 23%.
    [0092] The mixture is passed through a 3D dynamic mixer, for example Turbula®, for 6 hours.
    [0093] The mixture is finally coarsely sieved (1 mm) to recover the zirconia balls.
    [0094] Different powder mixtures were tested: the volume percentage of YSZ powders varies from 0.05% to 2% by volume. The mixtures of powders were observed with the SEM (FIGS. 3A to 3D). Aluminum alloy 6061 particles appear in gray and YSZ particles in white.
    [0095] The mixtures are then used to manufacture parts by 3D printing. By way of illustration, the SLM conditions making it possible to obtain the densest cubes are as follows: laser power: 190-270W; laser speed: 400-800mm/s, vector space: 100µm; layer thickness (powder bed): 20µm.
    [0096] For comparison, an aluminum part is made without adding YSZ powders.
    [0097] Parts made only with aluminum powder (Figure 4A) or with mixtures of powders containing 0.05% to 1% by volume of YSZ (Figure 4B to 4D) show cracks. The part obtained with the mixture of powders containing 2% by volume of YSZ powders is a dense part devoid of cracks (figure 4E).
    [0098] The part manufactured without adding YSZ powder and the one manufactured with 2% by volume of YSZ were characterized by backscattered electron diffraction (FIGS. 5A and 5B respectively): the addition of 2% by volume of YSZ leads to a refinement of the microstructure.
    [0099] The aluminum part made with 2% by volume of YSZ was also characterized by SEM. Whether in the XZ plane (FIG. 6A) or in the XY plane (FIG. 6B), the refinement of the grains is perfectly visible. The Z axis corresponds to the construction axis, i.e. the axis of the stacking of the layers of the powder mixture (or axis perpendicular to the construction plate); the X and Y axes correspond to the axes of the build plate, i.e. the X and Y axes are parallel to the main surface of the build plate on which the powder mixture layers are deposited.
    [0100] Finally, specific surface area measurements by BET were carried out on the different powder mixtures (figure 7). It can be seen that a specific surface area of at least 0.3 m 2 /g is required to solve the hot cracking problems. These measurements could form another source of characterization in terms of the amount of germinants to add to avoid cracking phenomena.
    [0101] References
    [0102] [1] Shen “Carbothermal synthesis of metal-functionalized nanostructures for energy and environmental applications”, J. Mater. Chem. A 3 (2015), 13114-13188.
    [0103] [2] Chu et al. “Sintering of aluminum nitride by using alumina crucible and MoSi 2 heating element at temperatures of 1650°C and 1700°C”, Ceramics International 35 (2009), 3455-3461.
    权利要求:
    Claims (12)
    [0001]
    Method for manufacturing an aluminum alloy part by additive manufacturing comprising a step during which a layer of a mixture of powders is locally melted and then solidified, characterized in that the mixture of powders comprises: - first particles (10) comprising at least 80% by mass of aluminum and up to 20% by mass of one or more additional elements, and - second particles (20) of yttria-containing zirconia, the mixture of powders comprising at least 1.5% by volume of second particles.
    [0002]
    Method according to any one of the preceding claims, characterized in that the second particles (20) have a larger dimension ranging from 5nm to 600nm, preferably from 100nm to 400nm, and even more preferably from 200nm to 300nm.
    [0003]
    Process according to any one of the preceding claims, characterized in that the volume percentage of second particles 20) in the mixture of powders ranges from 1.5% to 2.5%.
    [0004]
    Method according to any one of the preceding claims, characterized in that the first particles (10) have a larger dimension ranging from 10 µm to 100 µm, and preferably from 20 µm to 65 µm.
    [0005]
    Process according to any one of the preceding claims, characterized in that the additional elements are chosen from Cu, Si, Zn, Mg, Fe, Ti, Mn, Zr, Va, Ni, Pb, Bi and Cr.
    [0006]
    Method according to any one of the preceding claims, characterized in that the aluminum alloy is alloy 7075, alloy 2024, alloy 2219 or alloy 6061.
    [0007]
    Process according to any one of Claims 1 to 6, characterized in that the manufacturing process is a selective laser melting process.
    [0008]
    Process according to any one of Claims 1 to 6, characterized in that the manufacturing process is a selective electron beam melting process.
    [0009]
    Process according to any one of Claims 1 to 8, characterized in that the mixing of powders is carried out in a 3D dynamic mixer or by mechano-synthesis.
    [0010]
    .Process according to the preceding claim, characterized in that the specific surface of the mixture, after mixing with the 3D dynamic mixer, is greater than 0.3 m²/g.
    [0011]
    Aluminum alloy part obtained according to the process as defined in any one of Claims 1 to 10, characterized in that it comprises zirconia and yttrium.
    [0012]
    Part according to the preceding claim, characterized in that the part is a heat exchanger.
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    同族专利:
    公开号 | 公开日
    EP3741482A1|2020-11-25|
    FR3096056B1|2021-06-04|
    US20200360993A1|2020-11-19|
    RU2020115665A|2021-11-15|
    JP2020196949A|2020-12-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20180161874A1|2015-03-17|2018-06-14|Sinter Print, Inc.|Additive manufacturing of metal alloys and metal alloy matrix composites|
    WO2018144323A1|2017-02-01|2018-08-09|Hrl Laboratories, Llc|Aluminum alloys with grain refiners, and methods for making and using the same|
    US20190039183A1|2017-08-07|2019-02-07|Board Of Regents, The University Of Texas System|Method and system for powder bed fusion additive manufacturing of crack-free aluminium alloys|
    CN112207278A|2020-08-20|2021-01-12|南京航空航天大学|Selective laser melting additive manufacturing and discharge combined machining method for aluminum alloy gear|
    CN113416871A|2021-06-21|2021-09-21|青岛艾斯达特智能焊接设备有限公司|Soluble aluminum magnesium alloy and preparation method thereof, soluble aluminum magnesium alloy pipe and preparation method and application thereof|
    CN113564402A|2021-07-26|2021-10-29|内蒙古工业大学|Al-TiO2-C-XRE2O3Composite refiner, corrosion-resistant ZL205 alloy and preparation method thereof|
    法律状态:
    2020-05-30| PLFP| Fee payment|Year of fee payment: 2 |
    2020-11-20| PLSC| Publication of the preliminary search report|Effective date: 20201120 |
    2021-05-31| PLFP| Fee payment|Year of fee payment: 3 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1904935|2019-05-13|
    FR1904935A|FR3096056B1|2019-05-13|2019-05-13|METHOD OF MANUFACTURING AN ALUMINUM ALLOY PART BY ADDITIVE MANUFACTURING FROM A MIXTURE OF POWDERS CONTAINING YTTRIA ZIRCONIA|FR1904935A| FR3096056B1|2019-05-13|2019-05-13|METHOD OF MANUFACTURING AN ALUMINUM ALLOY PART BY ADDITIVE MANUFACTURING FROM A MIXTURE OF POWDERS CONTAINING YTTRIA ZIRCONIA|
    EP20172977.9A| EP3741482A1|2019-05-13|2020-05-05|Method for manufacturing a part made of aluminium alloy by additive manufacturing from a mixture of powders containing yttrium-stablised zirconia|
    JP2020083383A| JP2020196949A|2019-05-13|2020-05-11|Method for manufacturing aluminium alloy part by additive manufacturing from mixture of powders containing yttria-stabilized zirconia|
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