CN116761905A - Mg-Al magnesium alloy and preparation method and application of pipe thereof - Google Patents
Mg-Al magnesium alloy and preparation method and application of pipe thereof Download PDFInfo
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- CN116761905A CN116761905A CN202280009957.5A CN202280009957A CN116761905A CN 116761905 A CN116761905 A CN 116761905A CN 202280009957 A CN202280009957 A CN 202280009957A CN 116761905 A CN116761905 A CN 116761905A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 215
- 229910003023 Mg-Al Inorganic materials 0.000 title claims abstract description 115
- 238000002360 preparation method Methods 0.000 title claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 65
- 229910052751 metal Inorganic materials 0.000 claims abstract description 65
- 239000002184 metal Substances 0.000 claims abstract description 65
- 238000010438 heat treatment Methods 0.000 claims abstract description 62
- 239000011777 magnesium Substances 0.000 claims abstract description 56
- 238000003466 welding Methods 0.000 claims abstract description 39
- 238000005266 casting Methods 0.000 claims abstract description 35
- 238000003723 Smelting Methods 0.000 claims abstract description 32
- 238000002156 mixing Methods 0.000 claims abstract description 32
- 238000001125 extrusion Methods 0.000 claims description 94
- 229910052727 yttrium Inorganic materials 0.000 claims description 5
- 229910052691 Erbium Inorganic materials 0.000 claims description 3
- 229910052746 lanthanum Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 abstract description 9
- 238000000465 moulding Methods 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 35
- 238000009749 continuous casting Methods 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 18
- 238000005728 strengthening Methods 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000013078 crystal Substances 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 229910052684 Cerium Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a Mg-A1 series magnesium alloy and a preparation method and application of a pipe thereof, and belongs to the technical field of alloy materials. The magnesium alloy comprises the following components in percentage by weight: 7.0-8.6% of Al, 0.8-2.0% of RE, 0.2-0.8% of Mn and the balance of Mg, wherein the elongation of the magnesium alloy is 15-22%. The preparation method of the Mg-Al series magnesium alloy pipe comprises the following steps: mixing an Al source, an RE source, an Mn source and an Mg source and smelting the mixture into liquid mixed metal; semi-continuously casting the liquid mixed metal into bars; homogenizing the bar at 360-400 ℃ for 6-10h; and extruding and molding the bar after heat treatment to obtain the Mg-Al magnesium alloy pipe. The Mg-A1 magnesium alloy has high elongation, and the elongation after being molded into a pipe can reach 15-22%, so that the magnesium alloy can bear larger plastic deformation; meanwhile, the Mg-A1 series magnesium alloy has excellent welding performance, the welding loss rate is lower than 6%, the loss of the strength of the magnesium alloy section after welding is greatly reduced, and the strength of the magnesium alloy section after welding is ensured. The magnesium alloy can be used in the fields of vehicle equipment and medical appliances.
Description
Cross Reference to Related Applications
The present disclosure claims priority from chinese patent application No. CN 202110040804.4, entitled "a Mg-Al-based magnesium alloy and tube preparation method and application thereof," filed on day 13 1 month 2021, the entire contents of which are incorporated herein by reference.
The invention relates to a Mg-Al magnesium alloy, a preparation method of the magnesium alloy pipe and application of the Mg-Al magnesium alloy, and belongs to the technical field of alloy materials.
Magnesium alloys are the lightest metallic structural materials so far, with a density only corresponding to 2/3 of that of aluminum and 1/4 of that of steel, and possess very high specific strength and specific stiffness. In addition, the magnesium alloy has excellent performances such as good damping property, machinability, thermal conductivity, easy recovery, regeneration and the like, so that the application field of the magnesium alloy is increasingly expanded.
The magnesium alloy mainly comprises Mg-Al series and Mg-Zn-Zr series magnesium alloy, and the Mg-Al series magnesium alloy is widely applied because of lower preparation cost and simpler preparation method. However, the traditional Mg-Al series alloy has poor elongation and is easy to break when being impacted and deformed by external force or circularly loaded; and the magnesium alloy is generally connected with each other through welding when in use, and the welding loss rate of the traditional Mg-Al series alloy is larger after welding, so that a large amount of resources are wasted, and the welding firmness and the appearance aesthetic feeling are also affected.
Disclosure of Invention
The invention aims to: aiming at the problems of the existing Mg-Al magnesium alloy, the invention provides the Mg-Al magnesium alloy with high elongation and low welding loss rate, and provides a preparation method of the Mg-Al magnesium alloy pipe; in addition, the application of the Mg-Al series magnesium alloy in the fields of vehicle equipment and medical appliances is also provided.
The technical scheme is as follows: the Mg-Al series magnesium alloy comprises the following components in percentage by weight: 7.0-8.6% of Al, 0.8-2.0% of RE, 0.2-0.8% of Mn and the balance of Mg, wherein the elongation of the magnesium alloy is 15-22%.
Optionally, the elongation of the Mg-Al series magnesium alloy is 17 to 21.6 percent.
Optionally, the welding loss rate of the Mg-Al series magnesium alloy is less than 6%.
Optionally, the yield strength of the Mg-Al series magnesium alloy is 182-235MPa, and the tensile strength is 306-342 MPa.
Preferably, the weight percentage of Al in the Mg-Al series magnesium alloy is 7.0-8.2%, the weight percentage of RE is 1.1-2.0%, and the weight percentage of Mn is 0.4-0.8%. The magnesium alloy with the above parameter range can obtain lower welding loss rate (lower than 5.5%), higher elongation and higher strength.
Further preferably, the weight percentage of Al in the Mg-Al series magnesium alloy is 7.8-8.2%, the weight percentage of RE is 1.3-1.9%, and the weight percentage of Mn is 0.5-0.8%; and the weight percentage of Y in RE is 0.8-1.6%, and the weight percentage of Ce is 0-0.8%. At this time, the elongation of the obtained magnesium alloy is 17.4-21.6%, the welding loss rate is less than 5%, the yield strength reaches 220-235MPa, and the tensile strength reaches 320-342 MPa.
Still more preferably, the Mg-Al series magnesium alloy comprises 7.8-8.2 wt% of Al, 1.5-1.9 wt% of RE and 0.5-0.8 wt% of Mn; and the weight percentage of Y in RE is 0.8 percent, and the weight percentage of Ce is 0.5 to 0.8 percent. At this time, the welding loss rate of the obtained magnesium alloy was 4.3% or less.
Optionally, in the magnesium alloy, RE includes at least one of La, ce, nd, Y, gd, ho, dy and Er. RE is mainly Y and Ce, and other rare earth elements are trace.
The invention relates to a preparation method of a Mg-Al series magnesium alloy pipe, which comprises the following steps:
according to the weight percentage of elements, al 7.0-8.6%, RE 0.8-2.0%, mn 0.2-0.8% and the balance Mg, mixing and smelting Al source, RE source, mn source and Mg source into liquid mixed metal;
semi-continuously casting the liquid mixed metal into bars;
homogenizing the bar at 360-400 ℃ for 6-10h;
and extruding and molding the bar material after heat treatment to obtain the magnesium alloy pipe.
The Mg-Al series magnesium alloy is applied to the fields of vehicle equipment and medical appliances.
The beneficial effects are that: compared with the prior art, the invention has the advantages that: the Mg-Al series magnesium alloy has high elongation, and the elongation of the formed pipe can reach 15-22%, so that the magnesium alloy can bear larger plastic deformation; meanwhile, the welding loss rate of the Mg-Al series magnesium alloy is very low and is lower than 6%, so that the loss of the strength of the magnesium alloy section after welding is greatly reduced, and the strength of the magnesium alloy section after welding is ensured; in addition, the Mg-Al series magnesium alloy also has higher strength, the yield strength reaches 182-232 MPa, and the tensile strength reaches 306-340 MPa.
FIG. 1 is a flow chart of a preparation process of the Mg-Al series magnesium alloy.
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
The Mg-Al series magnesium alloy comprises the following components in percentage by weight: 7.0-8.6% of Al, 0.8-2.0% of RE, 0.2-0.8% of Mn and the balance of Mg.
Specifically, RE and Mn are added into Mg-Al series alloy in certain proportion, so that the plasticity and strength of the magnesium alloy are improved, and the welding loss rate of the alloy is reduced.
The addition of Mn can remove impurity element Fe introduced during semi-continuous casting, and is beneficial to welding performance and mechanical performance, so that the welding loss rate is reduced; meanwhile, mn does not form a compound in magnesium, can serve as heterogeneous nuclear particles, refines grains, promotes dynamic recrystallization when extruded into a pipe, refines the grains, weakens textures, and improves strength and plasticity.
The addition of RE can refine the grain size of the magnesium alloy, improve the morphology of the beta strengthening phase of the magnesium alloy and improve the strength and the plasticity of the magnesium alloy. The strength of the magnesium alloy can be embodied by yield strength and tensile strength, and after the Mg-Al series magnesium alloy is formed into a pipe, the yield strength of the pipe ranges from 182MPa to 235MPa, preferably, the yield strength of the pipe ranges from 220 MPa to 235MPa; meanwhile, the tensile strength of the Mg-Al series magnesium alloy pipe ranges from 306MPa to 342MPa, and is preferably 320 MPa to 340MPa. The elongation is directly related to the plasticity of the magnesium alloy, and after the Mg-Al series magnesium alloy provided by the invention is formed into a pipe, the elongation of the pipe can reach 15-22%, and preferably, the elongation of the Mg-Al series magnesium alloy pipe is 17-21.6%; the high elongation enables the magnesium alloy to bear larger plastic deformation, and the application range of the magnesium alloy is improved.
The welding strength loss rate is the strength loss rate of a welding sample compared with the original profile sample after the magnesium alloy profile is welded. The welding strength loss rate of the Mg-Al series magnesium alloy provided by the invention is less than 6%, preferably less than 5%, and more preferably less than 4.3%. According to the magnesium alloy provided by the embodiment of the invention, due to the addition of RE element, an Al-RE high-temperature stable phase is formed during high-temperature welding, and the high-temperature stable phase is pinned at a crystal boundary, so that the growth of magnesium alloy grains in the welding process is prevented; and RE element can greatly refine the size of the beta strengthening phase in the magnesium alloy, and avoid the growth of the beta strengthening phase in the high-temperature welding process, thereby reducing the loss of the strength of the magnesium alloy section after welding and ensuring the strength of the magnesium alloy section after welding.
Optionally, the weight percentage of Al in the Mg-Al series magnesium alloy is 7.0-8.6%, preferably, the weight percentage of Al in the Mg-Al series magnesium alloy is 7.0-8.2%; more preferably, the weight percentage of Al is in the range of 7.8-8.2%.
Specifically, when the weight percentage of Al in the Mg-Al series magnesium alloy is controlled in a certain range, the combination of the Al element and the Mg element has a second-phase strengthening effect, and in the process of forming the magnesium alloy, the beta strengthening phase in the optimal state (moderate volume fraction, morphology and size) can be obtained, so that the strength of the magnesium alloy is improved. Meanwhile, the Al element in the solid solution part of the magnesium matrix can play a role in solid solution strengthening and improving plasticity. When the weight percentage of Al in the Mg-Al series magnesium alloy is too high, for example, when the weight percentage of Al in the magnesium alloy is more than 8.6%, coarse eutectic beta phase is precipitated, on one hand, after welding, the interfacial bonding capability of a precipitated phase and a matrix is weakened, microscopic holes are easily formed at the interface of the matrix and the beta phase, the welding loss rate is increased, on the other hand, the coarse beta phase can cause stress concentration in the service process, plastic instability occurs in advance, and meanwhile, the elongation rate is reduced. When the weight percentage of Al in the magnesium alloy is too low, for example, less than 7%, the plasticity is not improved due to the reduction of Al element in the crystal, the quantity of precipitated phases is less, the grain refinement degree is reduced, the second phase strengthening effect is difficult to be achieved, and the strength of the magnesium alloy is not improved; in addition, after the alloy containing less precipitated phase is welded, the grain growth is more obvious, so that the welding loss rate is increased.
Optionally, the weight percentage of RE in the Mg-Al series magnesium alloy is in the range of 0.8-2.0%, preferably the weight percentage of RE in the Mg-Al series magnesium alloy is in the range of 1.1-2.0%, and more preferably the weight percentage of RE is in the range of 1.3-1.9%. Specifically, after RE is added into the Mg-Al series magnesium alloy, RE element has unique electronic arrangement structure and chemical characteristics, and proper amount of rare earth element is added into the magnesium alloy, so that the interatomic binding force can be enhanced, the diffusion speed of magnesium atoms can be reduced, the recrystallization temperature of the magnesium alloy can be increased, the recrystallization growth speed can be slowed down, and the formability and corrosion resistance of the magnesium alloy can be obviously improved; and RE is generally distributed in the grain boundary, so that the grain size of the magnesium alloy can be thinned, the coordination capacity among grains of the magnesium alloy is improved, and the RE can form a thermally stable beta strengthening phase in the magnesium alloy forming process, so that the strength and plasticity of the magnesium alloy are improved.
RE may include at least one of La, ce, nd, Y, gd, ho, dy and Er. Specifically, RE element in the Mg-Al series magnesium alloy is mainly Y and Ce, wherein the weight percentage range of Y is 0.8-1.6%, and the weight percentage range of Ce is 0-0.8%.
As shown in FIG. 1, the invention provides a preparation method of Mg-Al series magnesium alloy, which comprises the following steps:
s101, mixing an Al source, an RE source, an Mn source and an Mg source according to the weight percentage of elements of 7.0-8.6 percent of Al, 0.8-2.0 percent of RE, 0.2-0.8 percent of Mn and the balance of Mg, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into an ingot;
s103, homogenizing and heat treating the cast ingot at a first temperature;
s104, extruding and molding the heat-treated cast ingot to obtain the Mg-Al magnesium alloy.
Specifically, the casting process in S102 may be implemented by a semi-continuous casting process, and by using the semi-continuous process, the obtained crystal grains have smaller size due to rapid water cooling, and the fine crystal grains can simultaneously improve the strength and the elongation of the alloy. In S103, the first temperature range is 360-400 ℃, the heat treatment time is 6-10h, the content of Al element in the substrate can be increased by adopting a heat treatment process before extrusion, the sliding system is increased, and the alloy elongation is improved.
When preparing Mg-Al series magnesium alloy pipe, in step S102, casting the ingot into bar, namely casting the liquid mixed metal into bar; in the step S104, the bar after heat treatment is subjected to back extrusion molding, and the Mg-Al series magnesium alloy pipe is obtained. The technological parameters of the back extrusion molding comprise extrusion temperature, extrusion ratio and extrusion speed, wherein the extrusion temperature is 280-330 ℃, the extrusion ratio is 49:1, and the extrusion speed is 8-15mm/s.
The magnesium alloy provided by the present invention will be described in detail by way of specific examples and comparative examples, taking as an example the preparation of mg—al-based magnesium alloy pipes. The magnesium alloy pipe obtained by the preparation method provided by the embodiment of the invention has larger elongation percentage, can bear larger plastic deformation, has lower welding loss rate, and improves the application range of the magnesium alloy; meanwhile, the magnesium alloy has higher yield strength and tensile strength.
Example 1
The Mg-Al-based magnesium alloy includes: al 7g,Y 0.8g,Mn 0.5g,Mg 91.7g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 2
The Mg-Al-based magnesium alloy includes: al 7.4g,Y 0.8g,Mn 0.5g,Mg 91.3g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 360 ℃ for 10 hours;
s104, performing backward extrusion molding on the bar material subjected to heat treatment at the speed of 8mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 280 ℃, and the extrusion ratio is 49:1.
Example 3
The Mg-Al-based magnesium alloy includes: al 7.8g,Y 0.8g,Mn 0.5g,Mg 91.9g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 4
The Mg-Al-based magnesium alloy includes: al 8.2g,Y 0.8g,Mn 0.5g,Mg 90.5g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 380 ℃ for 6 hours;
s104, performing backward extrusion molding on the bar after heat treatment at the speed of 10mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 330 ℃, and the extrusion ratio is 49:1.
Example 5
The Mg-Al-based magnesium alloy includes: al 8.6g,Y 0.8g,Mn 0.5g,Mg 90.1g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 6
The Mg-Al-based magnesium alloy includes: al 7.8g,Y 1.2g,Mn 0.5g,Mg 90.5g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 7
The Mg-Al-based magnesium alloy includes: al 7.8g,Y 1.6g,Mn 0.5g,Mg 90.1g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 8
The Mg-Al-based magnesium alloy includes: al 7.8g, Y0.8 g, ce 0.3g (RE 1.1%), mn 0.5g, mg 90.6g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 9
The Mg-Al-based magnesium alloy includes: al 7.8g, Y1.2 g, ce 0.3g (RE 1.5%), mn 0.5g, mg 90.2g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 10
The Mg-Al-based magnesium alloy includes: al 7.8g, Y0.8 g, ce 0.5g (RE 1.3%), mn 0.5g, mg 90.4g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 11
The Mg-Al-based magnesium alloy includes: al 7.8g, Y0.8 g, ce 0.8g (RE 1.6%), mn 0.5g, mg 90.1g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 12
The Mg-Al-based magnesium alloy includes: al 7.8g, Y0.8 g, ce 0.5g, la 0.1g (RE 1.4%), mn 0.5g, mg 90.3g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 13
The Mg-Al-based magnesium alloy includes: al 7.8g, Y0.8 g, ce 0.5g, la 0.1g, nd 0.1g (RE 1.5%), mn 0.5g, mg 90.2g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 14
The Mg-Al-based magnesium alloy includes: al 7.8g, Y0.8 g, ce 0.5g, la 0.1g, nd 0.1g, gd 0.1g (RE 1.6%), mn 0.5g, mg 90.1g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 15
The Mg-Al-based magnesium alloy includes: al 7.8g, Y0.8 g, ce 0.5g, la 0.1g, nd 0.1g, gd 0.1g, ho 0.1g (RE 1.7%), mn 0.5g, mg 90.1g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 16
The Mg-Al-based magnesium alloy includes: al 7.8g, Y0.8 g, ce 0.5g, la 0.1g, nd 0.1g, gd 0.1g, ho 0.1g, dy 0.1g (RE 1.8%), mn 0.5g, mg 90.0g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 17
The Mg-Al-based magnesium alloy includes: al 7.8g, Y0.8 g, ce 0.5g, la 0.1g, nd 0.1g, gd 0.1g, ho 0.1g, dy 0.1g, er 0.1g (RE 1.9%), mn 0.5g, mg 89.9g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 18
The Mg-Al-based magnesium alloy includes: 8.0g of Al, 0.8g of Y, 0.5g of Ce (RE 1.3%), 0.5g of Mn and 90.4g of Mg.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 19
The Mg-Al-based magnesium alloy includes: 8.0g of Al, 0.8g of Y, 0.5g of Ce, 0.1g of La, 0.1g of Nd, 0.1g of Gd, 0.1g of Ho, 0.1g of Dy, 0.1g of Er (RE 1.9%), 0.5g of Mn and 89.6g of Mg.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 20
The Mg-Al-based magnesium alloy includes: al 8.2g, Y0.8 g, ce 0.5g, la 0.1g, nd 0.1g, gd 0.1g (RE 1.6%), mn 0.5g, mg 89.7g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 21
The Mg-Al-based magnesium alloy includes: al 7.8g, Y0.8 g, ce 0.5g (RE 1.3%), mn 0.2g, mg 90.7g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 22
The Mg-Al-based magnesium alloy includes: al 7.8g, Y0.8 g, ce 0.5g (RE 1.3%), mn 0.4g, mg 90.5g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Example 23
The Mg-Al-based magnesium alloy includes: al 7.8g, Y0.8 g, ce 0.5g (RE 1.3%), mn 0.8g, mg 90.1g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Comparative example 1
The Mg-Al-based magnesium alloy includes: al 6.5g,Y 0.8g,Mn 0.5g,Mg 92.2g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Comparative example 2
The Mg-Al-based magnesium alloy includes: al 9.6g,Y 0.8g,Mn 0.5g,Mg 89.1g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Comparative example 3
The Mg-Al-based magnesium alloy includes: al 7g,Y 0.5g,Mn 0.5g,Mg 92.0g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Comparative example 4
The Mg-Al-based magnesium alloy includes: al 7g,Y 2.3g,Mn 0.5g,Mg 90.2g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
Comparative example 5
The Mg-Al-based magnesium alloy includes: al 7g,Y 0.8g,Mg 92.2g.
The Mg-Al series magnesium alloy is prepared by the following preparation method, and concretely comprises the following steps:
s101, uniformly mixing an Al source, a Y source, an Mn source and an Mg source, and smelting the mixed raw materials into liquid mixed metal;
s102, casting the liquid mixed metal into bars through a semi-continuous casting process;
s103, carrying out heat treatment on the bar at 400 ℃ for 8 hours;
s104, performing back extrusion molding on the bar after heat treatment at a speed of 12mm/S to obtain the magnesium alloy pipe, wherein the extrusion temperature is 300 ℃, and the extrusion ratio is 49:1.
TABLE 1 Mg-Al series magnesium alloys of examples 1 to 20 and magnesium alloys of comparative examples 1 to 5 performance parameters
As can be seen from Table 1, the yield strengths of the magnesium alloy pipes of examples 1 to 23 can reach 182MPa or more, and the yield strength of the magnesium alloy pipe of example 19 reaches 235MPa; the tensile strength can reach more than 306MPa, and the tensile strength of the magnesium alloy pipe in the embodiment 19 reaches 342MPa; the elongation is more than 15%, and the elongation of the magnesium alloy pipe in the embodiment 17 reaches 21.6%; the welding loss rates of the magnesium alloy pipes of examples 1 to 23 were all less than 6%, and the welding loss rates of the magnesium alloy pipes of examples 15 to 17, examples 19 to 20 and example 23 were 4% or less and could be as low as 3.5%.
Comparative example 1 and comparative examples 1 to 2, in which the yield strength and tensile strength of the magnesium alloy were lower due to the lower content of Al added in comparative example 1, as low as 165Mpa and 287Mpa, respectively, and the welding loss rate was increased; in comparative example 2, since the content of Al added was too high, the magnesium alloy had poor plasticity, the elongation was reduced to 12.7%, and at the same time, the welding loss rate was remarkably increased to 7.3%.
Comparative example 1 and comparative examples 3 to 4, in which the yield strength and tensile strength of the magnesium alloy are low and the plasticity is also poor due to the excessively low content of RE added in comparative example 3, the elongation is only 13.9%, and at the same time, the welding loss rate is increased; the RE content added in comparative example 4 was too high, and although the yield strength and tensile strength of the magnesium alloy were improved, the molding was significantly deteriorated, the elongation was only 12.8%, and the welding loss rate was also increased.
In comparative example 1 and comparative example 5, the overall performance of the magnesium alloy was lowered due to the absence of Mn in comparative example 5, wherein the elongation was significantly reduced and the welding loss rate was significantly increased beyond 6%.
The Mg-Al series magnesium alloy can be applied to the fields of vehicle equipment and medical equipment, for example, the Mg-Al series magnesium alloy is formed into bars, and a plurality of magnesium alloy bars can be used as bearing members and supporting members of equipment such as wheelchairs, stretchers, bicycles, mountain bikes and the like after being welded, so that the weight of the equipment is reduced, and the strength and the stability of the equipment are ensured.
Claims (9)
- The Mg-Al magnesium alloy is characterized by comprising the following components in percentage by weight: 7.0-8.6% of Al, 0.8-2.0% of RE, 0.2-0.8% of Mn and the balance of Mg, wherein the elongation of the magnesium alloy is 15-22%.
- The Mg-Al-based magnesium alloy according to claim 1, wherein the weight percentage of Al in the magnesium alloy is 7.0 to 8.2%, the weight percentage of RE is 1.1 to 2.0%, and the weight percentage of Mn is 0.4 to 0.8%.
- The Mg-Al-based magnesium alloy according to claim 2, wherein the magnesium alloy comprises 7.8 to 8.2 wt% of Al, 1.3 to 1.9 wt% of RE, and 0.5 to 0.8 wt% of Mn; the weight percentage of Y in RE is 0.8-1.6%, and the weight percentage of Ce is 0-0.8%.
- The Mg-Al-based magnesium alloy according to claim 1, wherein said magnesium alloy has an elongation of 17 to 21.6%.
- The Mg-Al-based magnesium alloy according to claim 1, wherein a welding loss rate of said magnesium alloy is less than 6%.
- The Mg-Al-based magnesium alloy according to claim 1, wherein said magnesium alloy has a yield strength of 182 to 235MPa and a tensile strength of 306 to 342MPa.
- The Mg-Al-based magnesium alloy of claim 1, wherein said RE comprises at least one of La, ce, nd, Y, gd, ho, dy and Er.
- The preparation method of the Mg-Al series magnesium alloy pipe is characterized by comprising the following steps:according to the weight percentage of elements, al 7.0-8.6%, RE 0.8-2.0%, mn 0.2-0.8% and the balance Mg, mixing and smelting Al source, RE source, mn source and Mg source into liquid mixed metal;semi-continuously casting the liquid mixed metal into bars;homogenizing the bar at 360-400 ℃ for 6-10h;and (3) performing back extrusion molding on the bar after heat treatment to obtain the magnesium alloy pipe.
- Use of the Mg-Al-based magnesium alloy of any one of claims 1 to 7 in the field of vehicular equipment and medical devices.
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| PCT/CN2022/071812 WO2022152212A1 (en) | 2021-01-13 | 2022-01-13 | Mg-al magnesium alloy, preparation method for tube made of mg-al magnesium alloy, application of mg-al magnesium alloy |
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