Copper-containing heat resisting rare-earth magnesium alloy and preparation method thereof

A rare earth magnesium and heat-resistant technology is applied in the fields of magnesium alloys and their preparation, copper-containing heat-resistant rare earth magnesium alloys and their preparation fields, and achieves the effects of excellent high temperature strength and creep resistance, acceptable cost and good plasticity

Active Publication Date: 2009-04-01
SHANGHAI LIGHT ALLOY NET FORMING NAT ENG RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the preparation of high-strength and high-toughness Mg-Cu-RE alloys by ordinary casting technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Alloy composition (atomic percentage): 2% Y and 1% Cu; the rest is Mg and unavoidable impurities. Among them, the content of impurity elements is: Fe<0.002% and Ni<0.001%.

[0026] The specific steps of the melting process of the alloy are as follows: (1) configure the alloy according to the above components, add pure magnesium into the resistance crucible furnace, and use SF 6 / CO 2 Mixed gas for protection; (2) Add Mg-Cu master alloy: after the magnesium ingot is completely melted, add Mg-Cu master alloy at 660-680°C; (3) Add Y: add Mg to the magnesium liquid at 740°C -Y intermediate alloy; (4) Casting: Raise the temperature of the magnesium liquid to 800°C, keep it warm for 30 minutes and then cool it down to 760°C, electrify and refine it for 10 minutes, and control the standing time after refining to 40 minutes. After the magnesium liquid cools to 740°C, skim off The surface scum is removed for casting, and the steel mold for casting is preheated to 250°C.

[00...

Embodiment 2

[0029] Alloy composition (atomic percentage): 2% Y, 0.5% La, and 0.5% Cu; the remainder is Mg and unavoidable impurities. Among them, the content of impurity elements is: Fe<0.002% and Ni<0.005%.

[0030] The specific steps of the melting process of the alloy are as follows: (1) configure the alloy according to the above components, add pure magnesium into the resistance crucible furnace, and use SF 6 / CO 2 Mixed gas for protection; (2) Add Mg-Cu master alloy: after the magnesium ingot is completely melted, add Mg-Cu master alloy at 660-680°C; (3) Add Y and La: add it to the magnesium solution at 740°C Add Mg-Y and Mg-La master alloys; (4) Casting: Raise the temperature of the magnesium solution to 800°C, keep it warm for 30 minutes, then cool it down to 760°C, electrify and refine for 10 minutes, and control the standing time after refining to 40 minutes. After the molten magnesium is cooled to 740°C, the scum on the surface is skimmed off for casting, and the steel mold fo...

Embodiment 3

[0033] Alloy composition (atomic percentage): 2% Y, 0.5% Ce and 0.1% Cu; the rest is Mg and unavoidable impurities. Among them, the content of impurity elements is: Fe<0.002% and Ni<0.005%.

[0034] The specific steps of the melting process of the alloy are as follows: (1) configure the alloy according to the above components, add pure magnesium into the resistance crucible furnace, and use SF 6 / CO 2 Mixed gas for protection; (2) Add Mg-Cu master alloy: after the magnesium ingot is completely melted, add Mg-Cu master alloy at 660-680°C; (3) Add Y and Ce: add Mg-Cu master alloy to the magnesium solution at 740°C Add Mg-Y and Mg-Ce master alloys; (4) Casting: raise the temperature of the magnesium solution to 800°C, keep it warm for 20-30 minutes, then cool down to 760°C, power on and refine for 10 minutes, and control the standing time after refining between 40 minutes After the molten magnesium is cooled to 740°C, skim off the scum on the surface for casting, and the steel ...

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Abstract

The invention relates to a Cu-bearing heat-resistance rare earth magnesium alloy pertaining to the metal material technology field and a preparation method thereof, the magnesium alloy comprises Cu and at least one alloy element of element composed of Y, Gd, Sm, Nd, La, Ce, Tb, Dy, Ho, Er and Tm, wherein, the atomic percent of copper is a, the total atomic percent of the alloy element is b, and the residual quantity are Mg and impurities, wherein, a and b meet that: a is equal to or more than 0.1 and equal to or less than 5, and b is equal to or more than 0.5 and equal to or less than 5. The preparation of the magnesium alloy comprises a melting process and a follow-up heat treatment process, the magnesium alloy can be taken as cast magnesium alloy and deformation magnesium alloy, and has better mechanical properties such as room-temperature, hot strength and the like than traditional WE series commercial magnesium.

Description

technical field [0001] The invention relates to a magnesium alloy in the technical field of metal materials and a preparation method thereof, in particular to a copper-containing heat-resistant rare earth magnesium alloy and a preparation method thereof. Background technique [0002] As the lightest metal structure material, magnesium alloy can meet the increasingly stringent requirements of automobile exhaust emission, and can produce new automobiles with light weight, low fuel consumption and environmental protection, so it has received extensive attention in the automobile industry. However, the mechanical properties such as low room temperature strength, high temperature strength and plasticity restrict its application in engine and power system parts. Therefore, heat-resistant magnesium alloys with high strength, high toughness and high creep resistance have been proposed. Rare earth elements are considered to be important elements used to improve the heat resistance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03B22D21/04C22F1/06
CPCC22F1/06C22C23/06
Inventor 王渠东高岩
Owner SHANGHAI LIGHT ALLOY NET FORMING NAT ENG RES CENT
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