Die-casting heat resisting magnesium alloy and preparation thereof

A magnesium alloy, heat-resistant technology, applied in the field of metal materials, can solve the problems of decreased creep resistance, poor plasticity, and low elongation

Active Publication Date: 2009-01-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After searching the prior art, it is found that rare earth elements are considered to be important elements used to improve the heat resistance of magnesium alloys. I.P.Moreno and others in "Scripta Materialia", 2003, 48: 1029-1034, "Microstructural stability and creep of rare -earth containing magnesium alloys" studied the high-temperature stability of Mg-RE-Zn alloy microstructure and the high-temperature creep resistance of the alloy, and found that t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1:

[0022] The alloy composition (weight percentage) is: 5.7% Sm, 1.8% Zn, 0.2% Zr, the content of impurity elements is less than 0.02%, and the rest is Mg. The smelting process of the alloy is: configure the alloy according to the above composition, add 100Kg of industrial pure magnesium to the resistance crucible boiler, and use N 2 +0.2%SF 6 Mixed gas protection, after the magnesium is completely melted, add industrial pure zinc 0.4Kg, Mg-25Sm master alloy 95Kg at 650℃, add Mg-30Zr master alloy 3Kg at 760℃, keep it for 2~3 minutes, stir and heat up to 780℃ And keep the temperature at this temperature for 10 minutes, then lower the temperature to 750-760°C for refining, then keep the temperature for about 30 minutes, and lower the temperature to about 680°C for die-casting.

[0023] The room temperature tensile strength of the alloy in this example is 214MPa, the yield strength is 142MPa, and the elongation is 8.6%; the tensile strength at 200°C is 176MPa, the yi...

Example Embodiment

[0024] Example 2:

[0025] The alloy composition (weight percentage) is: 3.5% Sm, 2.7% Nd, 2.8% Zn, 0.4% Zr, the content of impurity elements is less than 0.02%, and the rest is Mg. The smelting process of the alloy is: configure the alloy according to the above composition, add 100Kg of industrial pure magnesium to the resistance crucible boiler, and use N 2 +0.2%SF 6 Mixed gas protection, after the magnesium is completely melted, add industrial pure zinc 0.4Kg, Mg-25Sm master alloy 45Kg and Mg-25Nd master alloy 40Kg at 660℃, add Mg-30Zr master alloy 3Kg at 760℃, keep for 2~3 minutes After stirring, the temperature is raised to 780°C and kept at this temperature for 10 minutes, then the temperature is lowered to 750-760°C for refining, and then the temperature is kept for about 30 minutes, and the temperature is lowered to about 680°C for die casting.

[0026] The room temperature tensile strength of the alloy of this example is 221MPa, the yield strength is 147MPa, and the elong...

Example Embodiment

[0027] Example 3:

[0028] The alloy composition (weight percentage) is: 0.5% Sm, 2.4% Ca, 1.8% Zn, 0.4% Zr, the content of impurity elements is less than 0.02%, and the rest is Mg. The smelting process of the alloy is: configure the alloy according to the above composition, add 100Kg of industrial pure magnesium to the resistance crucible boiler, and use N 2 +0.2%SF 6 Mixed gas protection. After the magnesium is completely melted, add 2.0Kg of industrial pure zinc at 660℃, at the same time add 2.5Kg of industrial pure calcium, 4Kg of Mg-25Sm master alloy, and 3.9Kg of Mg-30Zr master alloy at 760℃, keep the temperature for 2~ After 3 minutes, stir, raise the temperature to 780°C and keep it at this temperature for 10 minutes, then lower the temperature to 750-760°C for refining, then keep it for about 30 minutes, and then lower the temperature to about 680°C for die-casting.

[0029]The room temperature tensile strength of the alloy of this example is 208MPa, the yield strength is...

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Abstract

The invention relates to a die-casting heat resistant magnesium alloy and a preparation method thereof, pertaining to the metal material technology field. The components and weight percentage thereof of the alloy are as follows: 1.5 to 6.0 percent of Sm, 0 to 3.0 percent of Nd, 0 to 2.5 percent of Ca, 0.1 to 2.0 percent of Zn, 0.2 to 0.8 percent of Zr, lower than 0.02 percent of impurity elements, and the rest is Mg. The preparation method of the alloy comprises the following steps: the materials are weighed, and industrial pure Mg is heated under the protection of the mixed gas of N2 and SF6; after Mg is wholly melted, industrial pure Zn, industrial pure Ca and Mg-Sm interalloy and Mg-Nd interalloy are added at the temperature of 650 to 680 DEG C, Mg-Zr interalloy is added at the temperature of 760 DEG C, the temperature is maintained and the mixture is stirred, then the temperature is increased to 780 to 800 DEG C and maintained, after that the temperature is adjusted to 750 to 760 DEG C for refining and maintained for 30min, and when the Mg liquid is cooled to 680 to 700 DEG C, the mixture carries out die casting. The alloy of the invention has excellent tensile strength, yield strength and elongation and creep resistance simultaneously, and has good die-casting performance.

Description

technical field [0001] The invention relates to an alloy in the technical field of metal materials and a preparation method thereof, in particular to a die-casting heat-resistant magnesium alloy added with alloy elements (Sm, Nd, Ca, Zn, Zr) and a preparation method thereof. Background technique [0002] Lightweight has gradually become the development direction of modern automobiles, and magnesium alloys, as the most promising light alloys, will be more widely used in the automobile industry. At present, the magnesium alloy parts in automobiles are basically die-casting parts. Among the existing cast magnesium alloys, AZ91D, AM50 and other alloys are most widely used. These magnesium alloys have excellent mechanical properties, corrosion resistance and die-casting properties. However, when the operating temperature exceeds 120°C, the creep properties of these alloys drop sharply, so they cannot be used to produce structural parts such as automotive power transmission and l...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03
Inventor 王渠东郑江顾金海金正力
Owner SHANGHAI JIAO TONG UNIV
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