EP4279622A1 - Alliage de magnésium mg-al, procédé de préparation pour tube constitué d'alliage de magnésium mg-al, application d'alliage de magnésium mg-al - Google Patents

Alliage de magnésium mg-al, procédé de préparation pour tube constitué d'alliage de magnésium mg-al, application d'alliage de magnésium mg-al Download PDF

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Publication number
EP4279622A1
EP4279622A1 EP22739088.7A EP22739088A EP4279622A1 EP 4279622 A1 EP4279622 A1 EP 4279622A1 EP 22739088 A EP22739088 A EP 22739088A EP 4279622 A1 EP4279622 A1 EP 4279622A1
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EP
European Patent Office
Prior art keywords
magnesium alloy
source
bar
based magnesium
mixed metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22739088.7A
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German (de)
English (en)
Inventor
Daqing Fang
Xiaoru Zhang
Xiangdong DING
Jun Yang
Peng Liu
Baoluo GONG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Allite Jiangsu Magnesium Technology Co Ltd
Original Assignee
Allite Jiangsu Magnesium Technology Co Ltd
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Filing date
Publication date
Application filed by Allite Jiangsu Magnesium Technology Co Ltd filed Critical Allite Jiangsu Magnesium Technology Co Ltd
Publication of EP4279622A1 publication Critical patent/EP4279622A1/fr
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/20—Making uncoated products by backward extrusion
    • B21C23/205—Making products of generally elongated shape
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences

Definitions

  • the present disclosure relates to a Mg-AI based magnesium alloy, and a preparation method of a tube of the magnesium alloy, and an application of the magnesium alloy, and belongs to the technical field of alloy materials.
  • Magnesium alloys are by far the lightest metal structural material, their density is only 2/3 of that of aluminum and 1/4 of that of steel, and they have high specific strength and specific stiffness. In addition, magnesium alloys also have many excellent properties such as good damping, cutting machinability and thermal conductivity, as well as easy recovering and regeneration, making their application fields increasingly expanded.
  • Magnesium alloys mainly include Mg-Al based and Mg-Zn-Zr based magnesium alloys, and Mg-AI based magnesium alloys have been widely used because of their lower preparation costs and simpler preparation methods.
  • the traditional Mg-Al based alloys have poor elongation, and are prone to fracture when subjected to external impact deformation or cyclic loading.
  • magnesium alloys are generally connected to each other by welding during application, and traditional Mg-Al based alloys have a large welding loss rate after welding, which not only causes a lot of waste of resources, but also affects the welding firmness and aesthetic appearance.
  • the disclosure in view of the problems of the existing Mg-Al based magnesium alloys, the disclosure provides a Mg-AI based magnesium alloy with high elongation and low welding loss rate and provides a preparation method of a tube of the Mg-Al based magnesium alloy; in addition, an application of the Mg-Al based magnesium alloy in the fields of vehicle equipment and medical equipment is also provided.
  • the Mg-AI based magnesium alloy of the present disclosure includes, by weight percentage, 7.0-8.6% Al, 0.8-2.0% RE, 0.2-0.8% Mn, and a balance of Mg, and the magnesium alloy has an elongation of 15-22%.
  • the elongation of the Mg-Al based magnesium alloy is 17-21.6%.
  • the Mg-AI based magnesium alloy has a welding loss rate of less than 6%.
  • the Mg-AI based magnesium alloy has a yield strength of 182-235 MPa and a tensile strength of 306-342 MPa.
  • the weight percentage of Al is 7.0-8.2%
  • the weight percentage of RE is 1.1-2.0%
  • the weight percentage of Mn is 0.4-0.8%.
  • the magnesium alloys with components within the above parameter range can achieve lower welding loss rate (less than 5.50%), higher elongation, and higher strength.
  • the weight percentage of Al is 7.8-8.2%
  • the weight percentage of RE is 1.3-1.9%
  • the weight percentage of Mn is 0.5-0.8%
  • the weight percentage of Y is 0.8-1.6%
  • the mass percentage of Ce is 0-0.8%.
  • the obtained magnesium alloy has an elongation of 17.4-21.6%, a welding loss rate of less than 5%, a yield strength of 220-235 MPa, and a tensile strength of 320-342 MPa.
  • the weight percentage of Al is 7.8-8.2%
  • the weight percentage of RE is 1.5-1.9%
  • the weight percentage of Mn is 0.5-0.8%
  • the weight percentage of Y is 0.8%
  • the mass percentage of Ce is 0.5-0.8%.
  • the obtained magnesium alloy has a welding loss rate of less than or equal to 4.3%.
  • RE includes at least one of La, Ce, Nd, Y, Gd, Ho, Dy, and Er.
  • RE includes mainly Y and Ce, and other rare earth elements are in trace amounts.
  • the preparation method of a tube of the Mg-Al based magnesium alloy according to the present disclosure comprises steps of:
  • the application of the Mg-Al based magnesium alloy of the present disclosure is use of the Mg-Al based magnesium alloy in the fields of vehicle equipment and medical equipment.
  • the advantages of the present disclosure includes: the Mg-AI based magnesium alloy of the present disclosure has high elongation, and the elongation of the tube formed using the same can reach 15-22%, so that the magnesium alloy can withstand large plastic deformation. Meanwhile, this Mg-AI based magnesium alloy has a very low welding loss rate of less than 6%, which greatly reduces the strength loss of magnesium alloy profiles after welding, and ensures the strength of magnesium alloy profiles after welding. In addition, the Mg-AI based magnesium alloy of the present disclosure also has high strength, its yield strength reaches 182-232 MPa, and its tensile strength reaches 306-340 MPa.
  • FIG. 1 is a flow chart of a preparation process of the Mg-Al based magnesium alloy of the present disclosure.
  • a Mg-AI based magnesium alloy of the present disclosure includes, by weight percentage, 7.0-8.6% Al, 0.8-2.0% RE, 0.2-0.8% Mn, and a balance of Mg.
  • RE rare earth element
  • Mn are added to a Mg-AI based alloy with components in a certain proportion, thereby improving the plasticity and strength of the magnesium alloy and reducing the welding loss rate of the alloy.
  • Mn allows removing the impurity element Fe introduced during semi-continuous casting, which is advantageous to welding performance and mechanical properties, thereby reducing the welding loss rate. Meanwhile, Mn does not form a compound in magnesium, and can be used as heterogeneous nucleation particles to refine grains. When the alloy is extruded into a tube, Mn promotes dynamic recrystallization, refines grains, and weakens texture, thereby improving strength and plasticity.
  • the addition of RE can refine the grain size of the magnesium alloy, improve the morphology of the ⁇ strengthening phase of the magnesium alloy, and enhance the strength and plasticity of the magnesium alloy.
  • the strength of the magnesium alloy can be reflected by the yield strength and tensile strength.
  • the range of the yield strength of the tube is 182-235 MPa, and preferably the range of the yield strength of the tube is 220-235 MPa.
  • the tensile strength of the Mg-Al based magnesium alloy tube ranges from 306 to 342 MPa, preferably 320 to 340 MPa.
  • the elongation has a direct correlation to the plasticity of the magnesium alloy.
  • the elongation of the tube can reach 15-22%, and preferably the elongation of the Mg-Al based magnesium alloy tube is 17-21.6%.
  • a high elongation allows the magnesium alloy to withstand large plastic deformation and improves the application range of the magnesium alloy.
  • the welding strength loss rate is the strength loss rate of the welded sample compared to the original profile sample after the magnesium alloy profile is welded.
  • the welding strength loss rate of the Mg-Al based magnesium alloy provided by the present disclosure is less than 6%, preferably, the welding strength loss rate is less than 5%, and more preferably, the welding strength loss rate is less than 4.3%.
  • the magnesium alloy provided by the examples of the present disclosure due to the addition of RE element, Al-RE high-temperature stable phase is formed during high temperature welding, and the high-temperature stable phase is pinned at the grain boundary, which hinders the growth of magnesium alloy grains during the welding process.
  • the RE element can greatly reduce/refine the size of the ⁇ strengthening phase in the magnesium alloy, and avoid the growth of the ⁇ strengthening phase in the high temperature welding process, thereby reducing the strength loss of the magnesium alloy profile after welding, and ensuring the strength of the magnesium alloy profile after welding.
  • the range of the weight percentage of Al in the Mg-AI based magnesium alloy of the present disclosure is 7.0-8.6%, preferably the range of the weight percentage of Al in the Mg-AI based magnesium alloy is 7.0-8.2%, and more preferably, the range of the weight percentage of Al is 7.8-8.2%.
  • the combination of Al and Mg elements has a second-phase strengthening effect, and during the formation process of the magnesium alloy, the ⁇ strengthening phase can achieve the optimum state (moderate volume fraction, morphology, and size), thereby improving the strength of magnesium alloys.
  • the Al element as a solid solution part in the magnesium matrix can play a role in solid solution strengthening and improving plasticity.
  • the weight percentage of Al in the Mg-AI based magnesium alloy is extremely high, for example, the weight percentage of Al in the Mg-AI based magnesium alloy is greater than 8.6%, due to the precipitation of the coarse eutectic ⁇ phase, on the one hand, after welding, the interface bonding ability between the precipitated phase and the matrix is weakened, and microscopic pores are easily formed at the interface between the matrix and the ⁇ phase, which increase the welding loss rate; and on the other hand, the coarse ⁇ phase may cause, in the course of service, stress concentration, advance occurrence of plastic instability and reduced elongation.
  • the weight percentage of Al in the magnesium alloy is extremely low, for example, less than 7%, the reduction of the Al element in the crystal is not conducive to improving the plasticity, and meanwhile, the amount of precipitated phase is less, and the degree of refinement of grains is reduced, causing the second phase strengthening effect not to be exhibited, which is not conducive to the improvement of the strength of the magnesium alloy.
  • the grain growth is more obvious, thus causing the welding loss rate to increase.
  • the range of the weight percentage of RE in the Mg-AI based magnesium alloy of the present disclosure is 0.8-2.0%, preferably, the range of the weight percentage of RE in the Mg-AI based magnesium alloy is 1.1-2.0%, and more preferably, the range of the weight percentage of RE is 1.3-1.9%.
  • RE is added to the Mg-AI based magnesium alloy
  • the RE element has a unique electronic arrangement structure and chemical characteristics
  • addition of an appropriate amount of rare earth elements to the magnesium alloy can enhance the interatomic bonding force, reduce the diffusion rate of magnesium atoms, increase the recrystallization temperature of the magnesium alloy, slow down the recrystallization growth rate, and significantly improve the formability and corrosion resistance of the magnesium alloy.
  • RE is generally distributed in the grain boundaries and can reduce the grain size of the magnesium alloy and improve coordination ability between the grains of the magnesium alloy. RE can also form a thermally stable ⁇ strengthening phase during the formation process of the magnesium alloy, which improves the strength and plasticity of the magnesium alloy.
  • RE may include at least one of La, Ce, Nd, Y, Gd, Ho, Dy, and Er.
  • the RE elements in the Mg-AI based magnesium alloy of the present disclosure are mainly Y and Ce.
  • the weight percentage of Y ranges from 0.8% to 1.6%, and the weight percentage of Ce ranges from 0 to 0.8%.
  • the present disclosure provides a preparation method of the Mg-Al based magnesium alloy, comprising steps of:
  • the casting process in S102 can be implemented by a semi-continuous casting process.
  • the semi-continuous process due to rapid water cooling, the size of obtained grains is small, and the fine grains can improve both the strength and the elongation of the alloy.
  • the first temperature ranges from 360°C to 400°C, and the heat treatment time is 6-10h.
  • the heat treatment process before extrusion can increase the content of Al element in the matrix, increase the slip system, and improve the elongation of the alloy.
  • step S102 the ingot is cast into a bar, that is, the liquid mixed metal is cast into a bar; and in step S104, the heat-treated bar is subjected to back extrusion forming to obtain a Mg-AI based magnesium alloy tube.
  • the process parameters of back extrusion forming include extrusion temperature, extrusion ratio, and extrusion speed, among which the extrusion temperature ranges from 280°C to 330°C, the extrusion ratio is 49:1, and the extrusion speed ranges 8mm/s to 15mm/s.
  • the magnesium alloy tubes obtained by the preparation method provided in the examples of the present disclosure have a large elongation and can withstand large plastic deformation, and the magnesium alloy tubes have a low welding loss rate, and these properties improve the application range of the magnesium alloy. Also, the magnesium alloy has higher yield strength and tensile strength.
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • a Mg-Al based magnesium alloy included: 8.0g Al, 0.8g Y, 0.5g Ce (RE 1.3%), 0.5g Mn, and 90.4g Mg.
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • a Mg-Al based magnesium alloy included: 8.0g Al, 0.8g Y, 0.5g Ce, 0.1g La, 0.1g Nd, 0.1g Gd, 0.1 Ho, 0.1 Dy, 0.1 Er (RE 1.9%), 0.5g Mn, and 89.6g Mg.
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the Mg-AI based magnesium alloy was obtained by the following preparation method specifically including:
  • the yield strengths of the magnesium alloy tubes of Examples 1-23 can all reach 182MPa or greater, and the yield strength of the magnesium alloy tube of Example 19 reached 235MPa; the tensile strengths of them can all reach 306 MPa or greater, and the tensile strength of the magnesium alloy tube of Example 19 reached 342Mpa; the elongations of them were all greater than 15%, and the elongation of the magnesium alloy tube of Example 17 reached 21.6%; and the welding loss rates of the magnesium alloy tubes of Examples 1-23 were all less than 6%, and the welding loss rates of the magnesium alloy tubes of Examples 15-17, Examples 19-20, and Example 23 were less than or equal to 4%, and can be as low as 3.5%.
  • the Mg-AI based magnesium alloy of the present disclosure can be applied to the fields of vehicle equipment and medical equipment.
  • the Mg-AI based magnesium alloy is formed into a bar, and a plurality of magnesium alloy bars can be used, after welded, as a load-bearing member or support member for equipment such as a wheelchair, a stretcher, a bicycle, a mountain bike.
  • the Mg-AI based magnesium alloy can reduce the weight of the equipment above while ensuring the strength and stability of the equipment above.

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  • Chemical & Material Sciences (AREA)
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  • Mechanical Engineering (AREA)
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  • Metallurgy (AREA)
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EP22739088.7A 2021-01-13 2022-01-13 Alliage de magnésium mg-al, procédé de préparation pour tube constitué d'alliage de magnésium mg-al, application d'alliage de magnésium mg-al Pending EP4279622A1 (fr)

Applications Claiming Priority (2)

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CN202110040804.4A CN112877575B (zh) 2021-01-13 2021-01-13 一种Mg-Al系镁合金及其管材的制备方法和应用
PCT/CN2022/071812 WO2022152212A1 (fr) 2021-01-13 2022-01-13 Alliage de magnésium mg-al, procédé de préparation pour tube constitué d'alliage de magnésium mg-al, application d'alliage de magnésium mg-al

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EP4279622A1 true EP4279622A1 (fr) 2023-11-22

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EP (1) EP4279622A1 (fr)
JP (1) JP2024503546A (fr)
KR (1) KR20230131244A (fr)
CN (2) CN112877575B (fr)
AU (1) AU2022208124A1 (fr)
CA (1) CA3205147A1 (fr)
IL (1) IL304327A (fr)
WO (1) WO2022152212A1 (fr)

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CN112877575B (zh) * 2021-01-13 2022-03-15 鼎泰(江苏)轻合金有限公司 一种Mg-Al系镁合金及其管材的制备方法和应用
CN113635000B (zh) * 2021-08-27 2023-08-18 中国兵器工业第五九研究所 一种镁合金环件的挤轧复合成形方法

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CN1169989C (zh) * 2001-12-04 2004-10-06 上海交通大学 低热裂倾向性固溶强化高强度铸造镁合金的制备方法
JP4650280B2 (ja) * 2006-01-19 2011-03-16 ソニー株式会社 表示装置および方法、並びにプログラム
CN101586223A (zh) * 2009-05-14 2009-11-25 上海交通大学 含稀土变形镁合金的塑性成型方法
CN102051509A (zh) * 2010-12-28 2011-05-11 西安工业大学 高强韧耐热Mg—Al—RE—Mn变形镁合金及其板材的制备方法
CN102758110B (zh) * 2012-07-09 2015-05-06 无锡福镁轻合金科技有限公司 一种镁合金led灯管型材挤压成型工艺
CN107099713B (zh) * 2017-05-27 2018-07-31 东北大学 一种镁合金及其制备方法和应用
CN109338187B (zh) * 2018-11-19 2021-01-29 河北工业大学 一种低成本可高速挤压的高强韧变形镁合金及其制备方法
CN112877575B (zh) * 2021-01-13 2022-03-15 鼎泰(江苏)轻合金有限公司 一种Mg-Al系镁合金及其管材的制备方法和应用

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KR20230131244A (ko) 2023-09-12
CA3205147A1 (fr) 2022-07-21
WO2022152212A1 (fr) 2022-07-21
CN116761905A (zh) 2023-09-15
CN112877575B (zh) 2022-03-15
CN112877575A (zh) 2021-06-01
IL304327A (en) 2023-09-01
JP2024503546A (ja) 2024-01-25
AU2022208124A1 (en) 2023-07-27

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