High-strength creep resistant deforming magnesium alloy containing Ca and Si

A deformed magnesium alloy and creep-resistant technology, applied in the field of Si high-strength creep-resistant deformed magnesium alloy and Ca-containing field, can solve the problem of insufficient creep resistance of Ca-enhanced magnesium alloy, and achieve the effect of improving impact toughness

Inactive Publication Date: 2005-05-11
鄂尔多斯市天旭轻合金有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of existing high-temperature creep-resistant magnesium alloys, and propose a high-strength creep-resistant magnesium alloy containing Ca and Si, which can generate Mg simultaneously by adding Ca and Si 2 Si phase and Al 2 Reinforced magnesium alloy with Ca phase composite 2 Si phase or Al 2 Insufficient creep resistance of Ca-enhanced magnesium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Alloy composition (percentage by weight): 3.0% Al, 3.0% Ca, 0.05% Si, 0.1% Mn, 1% Zn, impurity elements are less than 0.02%, and the rest is Mg.

[0013] Under the protection of gas or covering agent, after the industrial pure magnesium is completely melted, the alloying elements Al, Ca, Mn, Zn, Si, after all the alloying elements are dissolved, stir with a tool to make it evenly mixed, remove the surface scum and cast it, and then plastically deform the ingot. The grain size of the alloy in this embodiment is 15 μm, and the tensile strength, yield strength and elongation at room temperature reach 290 MPa, 135 MPa, and 11%, respectively. The tensile strength, yield strength and elongation at high temperature 150°C are 172MPa, 125MPa, 28%, respectively.

Embodiment 2

[0015] Alloy composition (percentage by weight): 9.0% Al, 0.1% Ca, 1% Si, 0.3% Mn, 0.1% Zn, impurity elements are less than 0.02%, and the rest is Mg.

[0016] Under the protection of gas or covering agent, after the industrial pure magnesium is completely melted, the alloying elements Al, Ca, Mn, Zn, Si, after all the alloying elements are dissolved, stir with a tool to make it evenly mixed, remove the surface scum and cast it, and then plastically deform the ingot. The grain size of the alloy in this embodiment is 10 μm, and the tensile strength, yield strength and elongation at room temperature reach 300 MPa, 145 MPa, and 15%, respectively. High temperature 150°C tensile strength, yield strength and elongation are 180MPa, 130MPa, 35% respectively.

Embodiment 3

[0018] Alloy composition (percentage by weight): 4.0% Al, 2% Ca, 0.1% Si, 1% Mn, 0.05% Zn, impurity elements are less than 0.02%, and the rest is Mg.

[0019] Under the protection of gas or covering agent, after the industrial pure magnesium is completely melted, the alloying elements Al, Ca, Mn, Zn, Si, after all the alloying elements are dissolved, stir with a tool to make it evenly mixed, remove the surface scum and cast it, and then plastically deform the ingot. The grain size of the alloy in this embodiment is 8 μm, and the tensile strength, yield strength and elongation at room temperature reach 292 MPa, 147 MPa, and 14%, respectively. The tensile strength, yield strength and elongation at high temperature 150°C are 178MPa, 131MPa, 36%, respectively.

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Abstract

The invention was involved in the preparation method of high intensity creep resistance magnesium alloy containing Ca and Si. The alloy consist of 3-9% Al, 0.1-1% Mn, 0.1-3% Ca,0.05-1.0% Zn, 0.05-1.0%Si, impurity which was composed with<0.005%Fe, <0.015% Cu and <0.002% Ni and the rest was Mg. Mg2Si phase and Al2Ca phase were generated at the same time by adding Ca and Si to intensify magnesium alloy. The shortage of the creep resistance of magnesium alloy was overcome compared with the single phase of Mg2Si or Al2Ca. The invention wasn't involved rare metal and the cost was low. The strength of extension under room temperature / high temperature, yield strength, extensibility and creep resistance were improved obviously.

Description

technical field [0001] The invention relates to a deformed magnesium alloy, in particular to a high-strength creep-resistant and deformed magnesium alloy containing Ca and Si. Used in the field of metal materials. Background technique [0002] With the rise of oil prices, the strict national automobile exhaust emission standards and the strengthening of citizens' environmental protection awareness, lightweight has become an important direction for automobile development. Magnesium alloys with high specific strength, specific stiffness, and specific elastic modulus conform to history and are known as green metals in the 21st century. At present, the main reason why magnesium alloys have not been widely used in automobiles on a large scale is: 90% of magnesium alloy products are obtained from die-casting processes, which limits the variety and type of products; 90% of magnesium die-casting ingots are limited to small Structure. After plastic deformation (extrusion, rolling,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02
Inventor 王渠东陈永军翟春泉丁文江
Owner 鄂尔多斯市天旭轻合金有限责任公司
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