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Bi and Nd composite reinforced high-strength cast magnesium alloy and preparation method thereof

A casting magnesium alloy, high-strength technology, applied in the field of high-strength casting magnesium alloy, Mn, magnesium alloy containing Al, Zn, Bi and Nd, can solve the problem of low strength, achieve tensile strength improvement, excellent comprehensive mechanical properties, Effect of Yield Strength Improvement

Inactive Publication Date: 2011-11-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low strength of the existing AZ series magnesium alloys, the object of the present invention is to provide a high-strength casting magnesium alloy strengthened by Bi and Nd, to improve the mechanical properties of the alloy by means of fine grain strengthening and precipitation strengthening, so as to Expand the scope of application of magnesium alloy

Method used

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  • Bi and Nd composite reinforced high-strength cast magnesium alloy and preparation method thereof
  • Bi and Nd composite reinforced high-strength cast magnesium alloy and preparation method thereof
  • Bi and Nd composite reinforced high-strength cast magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, the alloy composition (weight percentage) is: 8.0% Al, 0.5% Zn, 0.2% Mn, 0.6% Bi, 0.8% Nd, impurity elements Fe0.003%, Cu0.008%, Ni0.001%, The remainder is Mg.

[0020] (1) Preheat pure Mg and pure Al at 200°C, preheat pure Bi, Mg-Nd and Al-Mn master alloys at 100°C, and dry them; at the same time, the conventional magnesium alloy refining agent RJ- 2 and the mold is preheated at 250°C.

[0021] (2) Heat the crucible to 730°C in a resistance furnace, and then put pure Mg in CO 2 with SF 6 Mixed gas (SF 6 The volume fraction is 0.5%) and melted in a crucible under protection. After melting, when the melt temperature is 730°C, add preheated pure Al, pure Bi, pure Zn, Al-Mn master alloy and Mg to the melt -Nd intermediate alloy, then stir the alloying elements until completely dissolved into the melt, heat the melt to 730-750°C and add conventional magnesium alloy refining agent RJ-2 accounting for 1wt% of the melt for refining, keep it at 730-750°C...

Embodiment 2

[0030] The difference from Example 1 is:

[0031] In this example, the components and weight percentages of the high-strength cast magnesium alloy strengthened by Bi and Nd are: 9.0% Al, 0.6% Zn, 0.2% Mn, 1.0% Bi, 0.5% Nd, impurity element Fe0.002% , Cu0.010%, Ni0.001%, and the rest is Mg.

[0032] The yield strength of the alloy in the casting state of the invention is 105MPa, the tensile strength is 203MPa, and the elongation is 7.2%. In the T6 state, the yield strength is 135MPa, the tensile strength is 230MPa, and the elongation is 4.8%.

Embodiment 3

[0034] The difference from Example 1 is:

[0035]In this example, the components and weight percentages of the high-strength cast magnesium alloy strengthened by Bi and Nd are: 7.0% Al, 0.3% Zn, 0.3% Mn, 0.2% Bi, 1.2% Nd, impurity element Fe0.001% , Cu0.009%, Ni0.001%, and the rest is Mg.

[0036] The yield strength of the alloy in the casting state of the invention is 104MPa, the tensile strength is 224MPa, and the elongation is 8.4%. In the T6 state, the yield strength is 140MPa, the tensile strength is 232MPa, and the elongation is 5.0%.

[0037] Embodiment 2,3 result shows, the present invention generates Mg simultaneously by adding Bi and Nd 3 Bi 2 、Al 2 Nd and Al 11 Nd 3 Magnesium alloys are strengthened by phase compounding, and Mg-Al-Zn-Mn-Bi-Nd alloys with excellent as-cast and heat-treated properties are obtained by means of precipitation strengthening and fine-grain strengthening. The yield strength and tensile strength of the alloy in the casting state and t...

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Abstract

The invention relates to the field of metal material magnesium alloys, in particular to a Bi and Nd composite reinforced high-strength cast magnesium alloy. The alloy comprises the following components in percentage by parts: 3.0-10.0% of Al, 0.01-1.0% of Zn, 0.01-1.0% of Mn, 0.01-3.0% of Bi, 0.01-3.0% of Nd, less than 0.005% of impurity Fe, less than 0.015% of Cu, less than 0.002% of Ni and the balance of Mg. Mg3Bi2, Al2Nd and Al11Nd3 composite reinforced magnesium alloys are simultaneously prepared by adding Bi and Nd, and a Mg-Al-Zn-Mn-Bi-Nd alloy with excellent performances of a cast state and a thermal treatment state is obtained in a separation reinforcement and fine grain reinforcement manner. The Bi and Nd composite reinforced high-strength cast magnesium alloy disclosed by the invention has better yield strength and tensile strength compared with a traditional AZ-system magnesium alloy under the cast state and a T6 state. Taking Mg-8Al-0.5Zn-0.2Mn-0.6Bi-0.8Nd for example, the yield strength rho 0.2 reaches 128MPa at the cast state, and the tensile strength rhob reaches 215MPa. Compared with the AZ 80 alloy under the same condition, the Bi and Nd composite reinforced high-strength cast magnesium alloy disclosed by the invention has the yield strength increased by 32% and the tensile strength increased by 10%. The yield strength rho 0.2 of the alloy reaches 141MPa and the tensile strength rhob thereof reaches 225MPa at the T6 state. Compared with the AZ 80 alloy under the same condition, the Bi and Nd composite reinforced high-strength cast magnesium alloy disclosed by the invention has the yield strength increased by16% and the tensile strength increased a little.

Description

technical field [0001] The invention relates to the field of magnesium alloys as metal materials, in particular to a high-strength cast magnesium alloy strengthened by Bi and Nd, which is a magnesium alloy containing Al, Zn, Mn, Bi and Nd. Background technique [0002] Modern industry puts forward the requirements of light weight and high strength for products. Magnesium alloy has gradually become the modern industry due to its advantages of low density, high specific strength and specific stiffness, good electrical and thermal conductivity and electromagnetic shielding, and excellent machinability. It is an ideal substitute material for products. In recent years, the market demand has been showing a steady growth trend, and it has been more and more widely used in the fields of automobiles, electronic products and aerospace. [0003] Traditional AZ-series magnesium alloys, such as AZ31, AZ61, AZ80 and AZ91, have become the most widely used alloys due to their low cost and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C23/00C22C1/03C22F1/06
Inventor 杨院生王亚霄李应举付俊伟罗天骄王晶
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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