CN107964602B - Effective method for improving plastic forming capability of high-strength Mg-Gd-Y-Nd-Zr magnesium alloy - Google Patents
Effective method for improving plastic forming capability of high-strength Mg-Gd-Y-Nd-Zr magnesium alloy Download PDFInfo
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000956 alloy Substances 0.000 claims abstract description 48
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 45
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 16
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 229910001093 Zr alloy Inorganic materials 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 5
- 229910052726 zirconium Inorganic materials 0.000 claims description 11
- 239000011777 magnesium Substances 0.000 claims description 10
- 229910052779 Neodymium Inorganic materials 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 7
- 238000000265 homogenisation Methods 0.000 claims description 7
- 229910052727 yttrium Inorganic materials 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 6
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 6
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 2
- 238000005242 forging Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 3
- 238000005098 hot rolling Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 10
- 229910000733 Li alloy Inorganic materials 0.000 description 6
- 239000001989 lithium alloy Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
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- 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
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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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
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- Metal Rolling (AREA)
Abstract
The invention relates to the field of plasticity improvement of high-strength magnesium alloy, in particular to a method for improving high-strength Mg-Gd-The method for the plastic forming capability of the Y-Nd-Zr magnesium alloy solves the problem of extremely poor high-strength plasticity. On the premise of keeping the relative content of all elements in the alloy unchanged, 5-20 wt% of Li element is added to form a beta-Li phase with strong plastic deformation capability in the alloy, the volume fraction (20-90%) of the formed beta-Li phase is controlled, the lithium-containing Mg-Gd-Y-Nd-Zr alloy with high strength and good plasticity is prepared, and the lithium-containing Mg-Gd-Y-Nd-Zr alloy is processed into a plate through alloy smelting and subsequent hot rolling. The tensile strength of the material of the invention under the condition of casting state is sigmab120-250 MPa, yield strength of sigma0.280 to 150MPa, an elongation of 10 to 30% and a density of 1.50 to 1.89g/cm3And the plate can not generate edge crack after being deformed by 40 percent of rolling amount at room temperature.
Description
Technical Field
The invention relates to the field of plasticity improvement of high-strength magnesium alloy, in particular to a method for improving the plasticity forming capability of high-strength Mg-Gd-Y-Nd-Zr magnesium alloy by effectively utilizing element Li.
Background
The density of magnesium alloy is the lowest of all metallic structural materials, 2/3 for aluminum alloy and 1/4 for stainless steel, respectively. If the magnesium alloy material can be applied to airplanes and vehicles by replacing stainless steel and aluminum alloy for the most part, the aims of light weight and speed increase of the magnesium alloy material can be achieved, and a series of problems related to energy conservation and environmental protection can be effectively solved. Meanwhile, the magnesium alloy also has the advantages of high specific strength and specific rigidity, strong high-energy particle penetration resistance, good electromagnetic shielding performance, good damping performance, excellent cutting processability and the like, so that the magnesium alloy has potential application prospects in high and new technical fields of aerospace, automobiles and the like.
However, compared with the traditional metal structural material, the magnesium alloy has lower absolute engineering strength, is difficult to meet the requirement of the bearing capacity of engineering components, and seriously restricts the application and further development of the alloy. In recent years, researchers find that the addition of rare earth elements can obviously strengthen the magnesium alloy, and the maximum tensile strength of the Mg-Gd-Y-Nd-Zr alloy can reach more than 400MPa, which is basically equivalent to that of a medium-strength aluminum alloy. However, Mg-Gd-Y-Nd-Zr magnesium alloy has extremely poor plasticity, and the elongation thereof is difficult to exceed 5%, so that the plastic forming capability of the alloy is very limited.
Early researches show that the addition of the element Li can promote the formation of a beta-Li phase in the magnesium alloy and can obviously improve the plastic forming capability of the alloy. It can be predicted that if a certain weight percentage of Li element is added into the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy to form a certain volume fraction of beta-Li phase, the plastic forming capability of the alloy can be effectively improved, and finally the practical engineering application of the high-strength magnesium alloy can be greatly promoted and widened.
Disclosure of Invention
The invention aims to provide an effective method for improving the plastic forming capacity of a high-strength Mg-Gd-Y-Nd-Zr magnesium alloy, which is characterized in that on the premise of keeping the relative content of all elements in the alloy unchanged, a certain weight percentage of Li element is added to form a beta-Li phase with strong plastic deformation capacity in the alloy, and the volume fraction of the formed beta-Li phase is controlled to prepare the lithium-containing Mg-Gd-Y-Nd-Zr alloy with high strength and good plasticity, so that the problems of poor plastic forming capacity and the like of the high-strength magnesium alloy are solved.
The technical scheme of the invention is as follows:
an effective method for improving the plastic forming capability of high-strength Mg-Gd-Y-Nd-Zr magnesium alloy, wherein the content of lithium in the alloy is 5-20%, and the volume fraction of a formed beta-Li phase is 20-90%.
The effective method for improving the plastic forming capability of the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy comprises the following steps of (by weight percent), wherein the gadolinium content is 5-10%; the yttrium content is 3-8%; the neodymium content is 0.5-2%; the zirconium content is 0.3-1.0%; the lithium content is 5-20%; the balance of magnesium.
The effective method for improving the plastic forming capability of the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy has the tensile strength of sigma under the as-cast conditionb120-250 MPa; yield strength of sigma0.280-150 MPa; the elongation is delta is 10-30%; the density of the alloy is 1.50-1.89 g/cm3。
According to the effective method for improving the plastic forming capacity of the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy, the alloy plate does not have edge crack after being deformed by 40% of rolling amount.
The effective method for improving the plastic forming capacity of the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy comprises the steps of melting the Mg-Gd-Y-Nd-Zr alloy and a pure lithium ingot in a vacuum smelting furnace, carrying out heat preservation for 3-5 hours at the temperature of 740-780 ℃, and carrying out casting forming in the furnace to obtain an ingot.
The effective method for improving the plastic forming capability of the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy comprises the steps of carrying out homogenization treatment on an ingot at the temperature of 300-400 ℃ for 6-10 hours, and tightly wrapping the ingot with aluminum foil to prevent the alloy from possibly burning due to high-temperature oxidation.
The effective method for improving the plastic forming capability of the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy is to perform plastic processing treatment on the cast ingot after the homogenization treatment at the temperature of between room temperature and 350 ℃.
The effective method for improving the plastic forming capability of the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy comprises the step of carrying out plastic processing treatment on the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy by extrusion, rolling or forging with different deformation ratios.
The design idea of the invention is as follows:
according to the invention, a certain weight percentage of Li element (preferably 8-12%) is reasonably added into the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy, and under the premise of keeping the relative contents of other elements in the alloy unchanged (in terms of weight percentage, the content of gadolinium (Gd) is 5-10%, the content of yttrium (Y) is 3-8%, the content of neodymium (Nd) is 0.5-2%, and the content of zirconium (Zr) is 0.3-1.0%;
the content is 5-20%; the balance of magnesium) so that a certain volume fraction of beta-Li phase is formed in the alloy (the volume fraction of the beta-Li phase is preferably 60-90%). After homogenization treatment, coarse eutectic structures in the alloy are dissolved in solid solution, and the effects are as follows: the stress concentration caused by the formation of large-size eutectic structures in the solidification process is eliminated, the plastic deformation coordination capacity of the beta-Li phase is greatly exerted, the edge crack phenomenon of the plate in the plastic processing deformation process is effectively avoided, and the plastic forming capacity of the alloy is finally obviously improved.
The invention has the advantages and beneficial effects that:
1. the method can fully utilize the element Li to improve the plastic deformation coordination capacity of the magnesium alloy, obviously improve the plastic processing forming capacity of the magnesium alloy and effectively promote the practical engineering application of the magnesium alloy.
2. The magnesium alloy material with low density, high strength and strong plastic forming capability is obtained by adopting the method, and the method is particularly suitable for the requirements of light weight, high strength and high toughness.
3. The invention has the advantages of simple equipment, low cost and simple and convenient processing technology operation.
Drawings
FIG. 1 contains XRD phase analysis results of high strength Mg-7% Gd-5% Y-1% Nd-0.5% Zr magnesium alloys (comparative example 1 and example 1) containing and not containing Li. In the figure, the abscissa 2 θ represents the diffraction angle (degree), and the ordinate Intensity represents the Intensity (a.u.)
FIG. 2 microstructure photographs of high strength Mg-7% Gd-5% Y-1% Nd-0.5% Zr magnesium alloys (comparative example 1 and example 1) containing and not containing Li. Wherein the content of the first and second substances,
(a) comparative example 1 alloy Mg-7% Gd-5% Y-1% Nd-0.5% Zr; (b) example 1 alloy Mg-7% Gd-5% Y-1% Nd-0.5% Zr-10% Li.
FIGS. 3(a) -3 (b) contain a comparison of the plastic deformability of the high strength Mg-7% Gd-5% Y-1% Nd-0.5% Zr magnesium alloys (comparative example 1 and example 1) without Li. In FIG. 3(a), the side surface of the alloy plate of comparative example 1, which was rolled with a rolling amount of 12% Mg-7% Gd-5% Y-1% Nd-0.5% Zr, showed severe edge cracking; FIG. 3(b) side surface of the plate of the alloy of example 1 rolled with Mg of 40%, Gd of 7%, Y of 5%, Nd of 1%, Nd of 0.5%, Zr of 10%, without edge crack.
Detailed Description
The present invention is further illustrated by the following specific examples, which are given by way of illustration and not by way of limitation, and the scope of the present invention is not limited by the following specific examples.
Comparative example 1
In the embodiment, the effective method for improving the plastic forming capability of the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy comprises the following steps:
i) magnesium-lithium alloy composition
The high-strength Mg-7% Gd-5% Y-1% Nd-0.5% Zr alloy is used, and the chemical components (weight percentage) of the alloy are as follows: the gadolinium content is 7%; the yttrium content is 5%; the neodymium content is 1%; the zirconium content was 0.5%; the balance of magnesium.
II) alloy smelting
Alloy smelting is carried out in a vacuum smelting furnace under the protection of argon, and casting molding is carried out in the furnace after heat preservation is carried out for 4 hours at the temperature of 770 ℃.
III) homogenization treatment
The high strength Mg-7% Gd-5% Y-1% Nd-0.5% Zr alloy was held at 400 ℃ for 8 hours and tightly wrapped with aluminum foil to prevent possible burning of the alloy due to high temperature oxidation.
IV) plastic working deformation
And (3) rolling and forming the homogenized alloy at room temperature, wherein the rolling amount is 12%.
V) characterization of microstructure
The preparation process of the tissue observation sample is as follows: the surface was smoothed with No. 1000 silicon carbide abrasive paper and then mechanically polished with an oil-based diamond paste. The XRD results show that the sample of comparative example 1 mainly contains alpha-Mg and Mg5Gd phases, and the corresponding photograph is shown in figure 1. Optical observation showed that the sample of comparative example 1 had no β -Li phase, and the corresponding photograph is shown in fig. 2 (a).
VI) mechanical property test
The room temperature tensile property sample of the alloy is plate-shaped, and the standard length of the sample is 25mm, the width is 5mm, and the thickness is 4 mm. Strain rate of 1X 10 in tensile test-3s-1Tensile tests were conducted on an MTS (858.01M) tensile-torsional tester to determine the tensile properties of the alloys, the yield and tensile strengths of which were 148MPa and 220MPa, respectively, and the elongation of which was 1%, as shown in Table 1.
VII), plastic working forming ability
When the rolling amount is 12%, the side surface of the high-strength Mg-7% Gd-5% Y-1% Nd-0.5% Zr alloy plate shows a severe edge crack phenomenon, as shown in FIG. 3 (a).
Example 1
In the embodiment, the effective method for improving the plastic forming capability of the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy comprises the following steps:
i) and the alloy components of Li-containing Mg-7%, Gd-5%, Y-1%, Nd-0.5%, Zr-10% and Li
The lithium-containing high-strength Mg-7% Gd-5% Y-1% Nd-0.5% Zr-10% Li alloy is used, and the chemical components (weight percentage content) are as follows: the gadolinium content is 7%; the yttrium content is 5%; the neodymium content is 1%; the zirconium content was 0.5%; the lithium content was 10%; the balance of magnesium.
II) alloy smelting
Melting Mg-Gd-Y-Nd-Zr alloy and pure lithium ingot in a vacuum smelting furnace, carrying out alloy smelting under the protection of argon, preserving heat at the temperature of 770 ℃ for 4 hours, and then carrying out casting molding in the furnace.
III) homogenization treatment
The high strength Mg-7% Gd-5% Y-1% Nd-0.5% Zr-10% Li alloy is heat preserved at 400 deg.C for 8 hours and is tightly wrapped with aluminum foil to prevent the burning of the alloy caused by high temperature oxidation.
IV) plastic working deformation
And (4) rolling and forming the homogenized alloy at room temperature, wherein the rolling amount is 40%.
V) characterization of microstructure
The preparation process of the tissue observation sample is as follows: the surface was smoothed with No. 1000 silicon carbide abrasive paper and then mechanically polished with an oil-based diamond paste. XRD results show that the sample of example 1 mainly contains beta-Li, alpha-Mg and Mg5Gd phases, and the corresponding photo is shown in figure 1. Optical observations showed that the volume fraction of the quasicrystalline phase formed in the sample of example 1 was 75%, and the corresponding photograph is shown in FIG. 2 (b).
VI) mechanical property test
The tensile sample processing and tensile property testing method comprises the following steps: the room temperature tensile property sample of the alloy is plate-shaped, and the standard length of the sample is 25mm, the width is 5mm, and the thickness is 4 mm. Strain rate of 1X 10 in tensile test-3s-1The tensile test was carried out on an MTS (858.01M) tensile torsion tester to determine the tensile properties corresponding to the alloy. The alloy samples of example 1 were tested to have yield and tensile strengths of 105MPa and 195MPa, respectively, and elongation of 24%, as shown in Table 1.
VII), plastic working forming ability
When the rolling amount is 40%, the high-strength Mg-7% Gd-5% Y-1% Nd-0.5% Zr-10% Li alloy plate has no edge crack on the side surface, as shown in figure 3 (b).
Example 2
In the embodiment, the effective method for improving the plastic forming capability of the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy comprises the following steps:
i) and the alloy components of Li-containing Mg-9%, Gd-6%, Y-1.5%, Nd-0.5%, Zr-10% and Li
The lithium-containing high-strength Mg-9% Gd-6% Y-1.5% Nd-0.5% Zr-10% Li alloy is used, and the chemical components (weight percentage) are as follows: the gadolinium content is 9%; the yttrium content is 6%; the neodymium content is 1.5%; the zirconium content was 0.5%; the lithium content was 10%; the balance of magnesium.
II) alloy smelting
Same as in example 1.
III) homogenization treatment
Same as in example 1.
IV) plastic working deformation
Same as in example 1.
V) characterization of microstructure
The tissue observation method was the same as in example 1. XRD results showed that the sample of example 2 contained predominantly β -Li, α -Mg and Mg5Gd phases. Optical observations showed that the volume fraction of quasicrystalline phase formed in the sample of example 2 was 75%.
VI) mechanical property test
Tensile specimen processing and tensile property testing methods were the same as in example 1. The alloy samples of example 2 were tested to yield and tensile strengths of 135MPa and 233MPa, respectively, and to elongation of 21%, as shown in Table 1.
VII), plastic working forming ability
When the rolling amount is 40%, the side surface of the high-strength Mg-9% Gd-6% Y-1.5% Nd-0.5% Zr-10% Li alloy plate has no edge crack phenomenon.
In the present invention, the mechanical property data of the high strength Mg-Gd-Y-Nd-Zr alloys (comparative example 1, example 1 and example 2) containing and not containing Li element are shown in Table 1.
TABLE 1
| Sample State | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) | Density (g/cm)3) |
| Comparative example 1 sample | 148 | 220 | 1 | 1.93 |
| Example 1 sample | 105 | 195 | 24 | 1.56 |
| Example 2 sample | 135 | 233 | 21 | 1.72 |
The embodiment result shows that the invention can effectively utilize the element Li to obviously improve the plastic forming capability of the high-strength Mg-Gd-Y-Nd-Zr magnesium alloy, solve the problem of poor magnesium alloy plasticity, simultaneously ensure that the alloy has higher engineering strength, and broaden the practical engineering application of the high-strength magnesium alloy.
Claims (4)
1. An effective method for improving the plastic forming capability of high-strength Mg-Gd-Y-Nd-Zr magnesium alloy is characterized in that: the gadolinium content in the alloy is 5-7% by weight; the yttrium content is 5-8%; the neodymium content is 0.5-2%; the zirconium content is 0.3-1.0%; the lithium content is 8-12%; the balance of magnesium, the volume fraction of the formed beta-Li phase is 20-90%;
the tensile strength of the alloy in the as-cast condition is sigmab= 120-250 MPa; yield strength of sigma0.2= 80-150 MPa; the elongation is delta = 10-30%; the density of the alloy is 1.50-1.89 g/cm3；
Melting Mg-Gd-Y-Nd-Zr alloy and pure lithium ingots in a vacuum smelting furnace, carrying out heat preservation for 3-5 hours at the temperature of 740-780 ℃ under the protection of argon, and then carrying out casting molding in the furnace to obtain cast ingots;
homogenizing the cast ingot at the temperature of 300-400 ℃ for 6-10 hours, and tightly wrapping the cast ingot with aluminum foil to prevent the alloy from possibly burning due to high-temperature oxidation.
2. An effective method for improving the plastic formability of a high-strength Mg-Gd-Y-Nd-Zr magnesium alloy according to claim 1, wherein: the alloy plate can not generate edge crack after being deformed by 40 percent of rolling amount.
3. An effective method for improving the plastic formability of a high-strength Mg-Gd-Y-Nd-Zr magnesium alloy according to claim 1, wherein: and carrying out plastic processing treatment on the cast ingot after the homogenization treatment at the temperature of between room temperature and 350 ℃.
4. An effective method for improving the plastic formability of a high-strength Mg-Gd-Y-Nd-Zr magnesium alloy, according to claim 3, wherein: the plastic working treatment is extrusion, rolling or forging with different deformation ratios.
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