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High-strength and high-toughness cast magnesium alloy and preparation method thereof

A technology for casting magnesium alloys and magnesium alloys, which is applied in the field of low-cost non-rare earth type high-strength and toughness casting magnesium alloys and their preparation, can solve the problems of limiting the popularization and application of alloys, increasing the cost of alloys, etc., so as to improve the morphology and distribution, and save energy. , the effect of improving plasticity

Active Publication Date: 2015-12-23
山东汇达蠕墨装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of expensive rare earth elements such as Gd, Y, and Zr need to be added to the alloy, which directly increases the cost of the alloy and limits the further application of the alloy.

Method used

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  • High-strength and high-toughness cast magnesium alloy and preparation method thereof
  • High-strength and high-toughness cast magnesium alloy and preparation method thereof
  • High-strength and high-toughness cast magnesium alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Take raw material by the mass percent of alloy Mg-4Bi-0.3Ca-1.0Zn (wt%): pure Bi, pure Zn, Mg-20Ca, all the other are Mg (every 1000 grams of target alloys can be made of 15 grams of Mg-20Ca , 10g grams of Zn, 40 grams of Bi and 935 grams of Mg formulated). And do a good job of surface treatment of raw materials (such as removal of dirt, scale, etc.).

[0038] (2) First, clean the melting furnace and heat it to 450°C, put the magnesium ingot preheated to 200°C into the crucible of the melting furnace, set the furnace temperature to 720°C, heat slowly, and the heating rate is 20-40°C / min, and maintain the set furnace temperature;

[0039] (3) After all the pure magnesium ingots are melted, respectively add pure Bi, pure Zn and Mg-20Ca intermediate alloys preheated to about 200°C to the magnesium melt, raise the furnace temperature to 730°C, and keep the temperature for 5-10 Minutes, then mechanically stirred for 3-5 minutes, then filled with argon gas for refining...

Embodiment 2

[0044] (1) Take raw material by the mass percent of alloy (Mg-6.0Bi-0.5Ca-1.0Zn): pure Bi, pure Zn, Mg-20Ca, all the other are Mg; And do the raw material surface treatment (as removing dirt, oxide skin, etc.).

[0045] (2) First clean the melting furnace and heat it to 450°C, put the magnesium ingot preheated to 200°C into the crucible of the melting furnace, set the furnace temperature to 720°C, and slowly heat the heating rate to 20-40°C / min , and maintain the set furnace temperature;

[0046] (3) After all the pure magnesium ingots are melted, add pure Bi, pure Zn and Mg-20Ca intermediate alloys preheated to about 200°C to the magnesium melt, raise the furnace temperature to 730°C, and keep the temperature for 5-10 Minutes, then mechanically stirred for 3-5 minutes, then filled with argon gas for refining and degassing, then adjusted the furnace temperature to the pouring temperature of 720°C, stood for 2-10 minutes, and poured to obtain the cast alloy. The whole process...

Embodiment 3

[0051] (1) Take raw material by the mass percent of alloy (Mg-7.0Bi-0.7Ca-1.0Zn): pure Bi, pure Zn, Mg-20Ca, all the other are Mg; And do the raw material surface treatment (as removing dirt, oxide skin, etc.).

[0052] (2) First clean the melting furnace and heat it to 450°C, put the magnesium ingot preheated to 200°C into the crucible of the melting furnace, set the furnace temperature to 720°C, and slowly heat the heating rate to 20-40°C / min , and maintain the set furnace temperature;

[0053] (3) After all the pure magnesium ingots are melted, add pure Bi, pure Zn and Mg-20Ca intermediate alloys preheated to about 200°C to the magnesium melt, raise the furnace temperature to 730°C, and keep the temperature for 5-10 Minutes, then mechanically stirred for 3-5 minutes, then filled with argon gas for refining and degassing, then adjusted the furnace temperature to the pouring temperature of 720°C, stood for 2-10 minutes, and poured to obtain the cast alloy. The whole process...

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Abstract

The invention discloses high-strength and high-toughness cast magnesium alloy. The high-strength and high-toughness cast magnesium alloy is Mg-Bi-Ca-Zn alloy and composed of, by weight, 3.0-8.0% of Bi, 0.1-1.2% of Ca, 0.1-2.0% of Zn and the balance Mg. According to the invention, Bi serves as the main alloy element, lots of Mg3Bi2 phases are formed through the simple alloying way, few Ca elements and Zn elements are adopted for improving the strength of the alloy, the Ca elements effectively improve the morphology and distribution of the Mg3Bi2 phases so as to improve the plasticity of the alloy, and therefore the high-strength and high-toughness cast magnesium alloy can be developed for the Mg-Bi alloy series. The cast magnesium alloy is high in strength and plasticity, the tensile strength of the alloy with the components optimized reaches about 270 MPa, the yield strength of the alloy reaches about 145 MPa, and the ductility of the alloy reaches about 10%. Thus, the strength can be as high as that of rare earth magnesium alloy, and the ductility is high.

Description

technical field [0001] The invention belongs to the field of metal materials and metallurgy, and relates to a low-cost non-rare earth type high-strength and tough cast magnesium alloy and a preparation method thereof; the novel magnesium alloy can be used as a potential heat-resistant magnesium alloy and a biomedical magnesium alloy material. Background technique [0002] Magnesium alloy has many advantages such as high specific strength, high specific stiffness, good casting performance, good electromagnetic shielding performance, excellent cutting performance, and easy recycling and reuse, making it widely used in the fields of electronics, aerospace and rail transit , especially as the modern automobile industry's demand for weight reduction and environmental protection becomes more and more urgent, the development of low-cost lightweight high-strength magnesium alloys has attracted more and more attention from various countries. [0003] In the application of existing ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03C22F1/06
Inventor 赵维民孟帅举余晖秦春玲王志峰
Owner 山东汇达蠕墨装备有限公司
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