A kind of high-strength and toughness casting magnesium alloy and preparation method thereof

A technology for casting magnesium alloys and magnesium alloys, which is applied in the field of high-strength and toughness casting magnesium alloys and their preparation, can solve the problems of low strength and toughness, and achieve the effects of low alloy cost, improved fluidity and processing performance, and enhanced oxidation resistance.

Active Publication Date: 2019-10-18
SHENYANG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the disadvantages of low strength and toughness of existing AM series alloys, and provides a high-strength and tough cast magnesium alloy containing Zn and Y and a preparation method thereof

Method used

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  • A kind of high-strength and toughness casting magnesium alloy and preparation method thereof
  • A kind of high-strength and toughness casting magnesium alloy and preparation method thereof
  • A kind of high-strength and toughness casting magnesium alloy and preparation method thereof

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preparation example Construction

[0025] A method for preparing a high-strength and toughness casting magnesium alloy, the method steps are as follows: select an industrial magnesium alloy AM50 ingot as a master alloy, preheat the master alloy ingot to 200-250°C, and 6 and N 2 Melt in a melting furnace protected by a mixed gas. After the master alloy is completely melted, raise the temperature to 700°C. Preheat the Mg-25%Y master alloy and directly add it to the melt. After it is completely melted, preheat Add pure Zn into the alloy melt, stir and mix evenly, let it stand for 20-30 minutes, then remove the surface scum, and pour it into a metal mold with a preheating temperature of 200°C.

[0026] The tensile strength of the alloy at room temperature is 205-215MPa, the yield strength is 100-110MPa, and the elongation is 9.5%-11%.

[0027] Such as Figure 4 Shown, the tensile mechanical property of AM50-Zn-Y alloy of the present invention is obviously better than AM50 alloy.

Embodiment 1

[0029] Select the industrial magnesium alloy AM50 as the master alloy, preheat the alloy to 200°C, and 6 and N 2 Melting under the protection of a mixed gas, the temperature is raised to 700 ° C, the Mg-25%Y master alloy is preheated and directly added to the melt, and after it is completely melted, the preheated pure Zn is added to the alloy melt. Stir to mix evenly, let it stand for 20 minutes, then remove the scum on the surface and pour it.

[0030] The composition of the casting obtained is shown in the following table (mass percentage):

[0031]

[0032] The tensile strength at room temperature is 205.8MPa, the yield strength is 100.2MPa, and the elongation is 11.0%.

Embodiment 2

[0034] Select the industrial magnesium alloy AM50 as the master alloy, preheat the alloy to 220°C, and 6 and N 2 Melting under the protection of a mixed gas, the temperature is raised to 700 ° C, the Mg-25%Y master alloy is preheated and directly added to the melt, and after it is completely melted, the preheated pure Zn is added to the alloy melt. Stir to mix evenly, let it stand for 30 minutes, scrape off the surface scum, and pour it.

[0035] Obtain the composition of casting as follows (mass percentage):

[0036]

[0037] The tensile strength at room temperature is 206.6MPa, the yield strength is 105.2MPa, and the elongation is 10.0%.

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Abstract

The invention belongs to the field of metal materials. In order to improve the disadvantage of low strength and toughness of existing commercial cast magnesium alloys, a high-strength and toughness cast magnesium alloy and a preparation method thereof are developed by adding metals Zn and Y into AM50 alloy. The ingredients are formulated according to mass percentage: 4.9~5.0% Al, 3.1~3.4% Zn, 0.7~0.75% Y, 0.25~0.3% Mn, impurity element Si is not more than 0.03%, and the total content of other impurities Fe, Ni and Cu is not More than 0.01%, Mg balance. The alloy of the invention has the advantages of low cost, simple melt treatment, good casting and forming performance, and high toughness, is easy to popularize and use, is particularly suitable for large-scale commercial production, and has great market potential. The room temperature mechanical properties of the alloy are higher than those of commercial AM50 alloy.

Description

technical field [0001] The invention mainly relates to a high-strength and toughness casting magnesium alloy and a preparation method thereof, belonging to the field of metal materials. Background technique [0002] Magnesium alloy is the lightest metal structural material in engineering application so far, and is widely used in fields such as automobiles, aviation and computers. Mg-Al-Mn (abbreviated as AM) alloys have been widely used in automotive steering wheel frames, seat frames and instrument panels due to their good ductility, good casting performance and low cost. However, the strength of AM series alloys is low, and it cannot meet the performance requirements of some key structural parts of automobiles (such as hubs). Studies have shown that the mechanical properties of magnesium alloys can be significantly improved by utilizing the effects of precipitation strengthening, fine grain strengthening and solid solution strengthening produced by alloying. At present, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/03
Inventor 王峰王威马德志王越王志刘正毛萍莉周乐
Owner SHENYANG POLYTECHNIC UNIV
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