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

A magnesium alloy and hot die casting technology, applied in the field of metal materials, can solve problems such as poor mechanical properties, and achieve the effects of strong versatility, easy industrial production, and mature melting process

Active Publication Date: 2017-01-11
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the deficiencies in the mechanical properties of existing die-casting AZ91, AM50 and AM60 magnesium alloys, especially the poor mechanical properties at high temperatures, and provides a high-strength, tough, heat-resistant die-casting magnesium alloy containing Ca and Sn and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Select the industrial magnesium alloy AM60 as the master alloy, preheat the alloy to 200°C, and 6 and N 2 Melt under the protection of a mixed gas, raise the temperature to 700°C, preheat pure Al, pure Ca and pure Sn and add them directly into the melt, stir and mix evenly, continue to heat up to 710°C, let stand for 30 minutes, and then Cool down to 700°C, scrape off the surface scum, and carry out die-casting.

[0025] The composition of the casting obtained is shown in the following table (mass percentage):

[0026] Ca sn Al mn Zn Si Fe+Ni+Cu Mg 0.95 0.65 6.52 0.32 0.014 0.026 0.009 margin

[0027] The tensile strength at room temperature is 260.8MPa, the yield strength is 170.3MPa, and the elongation is 10.5%. At 150°C, the tensile strength is 180.5MPa, the yield strength is 121.3MPa, and the elongation is 17.8%.

Embodiment 2

[0029] Select the industrial magnesium alloy AM60 as the master alloy, preheat the alloy to 220°C, and 6 and N 2 Melt under the protection of a mixed gas, raise the temperature to 700°C, preheat pure Al, pure Ca and pure Sn and add them directly into the melt, stir and mix evenly, continue to heat up to 720°C, let stand for 30 minutes, and then Lower the temperature to 690°C, scrape off the scum on the surface, and carry out die-casting.

[0030] Obtain the composition of casting as follows (mass percentage):

[0031] Ca sn Al mn Zn Si Fe+Ni+Cu Mg 0.95 0.73 7.15 0.36 0.018 0.023 0.008 margin

[0032] The tensile strength at room temperature is 270.3MPa, the yield strength is 179.6MPa, and the elongation is 10.1%. At 150°C, the tensile strength is 192.7MPa, the yield strength is 130.6MPa, and the elongation is 16.7%.

Embodiment 3

[0034] Select the industrial magnesium alloy AM60 as the master alloy, preheat the alloy to 250°C, and 6 and N 2 Melt under the protection of a mixed gas, raise the temperature to 700°C, preheat pure Al, pure Ca and pure Sn and add them directly into the melt, stir and mix evenly, continue to heat up to 720°C, let stand for 20 minutes, and then Cool down to 700°C, scrape off the surface scum, and carry out die-casting.

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

[0036] Ca sn Al mn Zn Si Fe+Ni+Cu Mg 1.06 0.45 8.0 0.20 0.015 0.03 0.009 margin

[0037] The tensile strength at room temperature is 279.7MPa, the yield strength is 184.8MPa, and the elongation is 9.3%. At 150°C, the tensile strength is 199.8MPa, the yield strength is 139.7MPa, and the elongation is 15.2%.

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Abstract

The invention belongs to the field of metal materials. In order to improve the problems of low strength, toughness and poor heat resistance of existing commercial die-casting magnesium alloys, a high-strength, toughness and heat-resistant alloy is developed by adding metal Ca, Sn and Al to AM60 alloy. Die-casting magnesium alloy and its preparation method, the composition of the magnesium alloy is prepared according to mass percentage: 6.5~8.0%Al, 0.95~1.1%Ca, 0.45~0.8%Sn, 0.2~0.4%Mn, Zn≤0.02%, impurity element Si ≤0.03%, other impurities (Fe+Ni+Cu) ≤0.01%, and the balance is Mg. The alloy of the invention has the advantages of low cost, simple melt treatment, good die-casting performance, high toughness and heat resistance, is easy to popularize and use, is especially suitable for large-scale commercial production, and has great market potential. The room temperature and high temperature mechanical properties of the alloy are higher than those of commercial AZ91 and AM60 alloys.

Description

technical field [0001] The invention mainly relates to a high-strength and toughness heat-resistant die-casting magnesium alloy and a preparation method thereof, belonging to the field of metal materials. Background technique [0002] As the lightest metal structural material, magnesium alloy is widely used in the fields of automobile, aviation and electronic equipment. Mg-Al alloys are currently the most widely used die-casting magnesium alloys, but their strength and toughness are limited, and the main strengthening phase Mg in Mg-Al alloys is 17 al 12 The phase is prone to coarsening and softening when the service temperature exceeds 120 °C, which cannot pin the grain boundary and hinder the slippage of dislocations, resulting in poor high-temperature performance of the alloy, which limits its application range to a certain extent. At present, in the commonly used Mg-Al series die-casting alloys, although AZ91 magnesium alloy has good fluidity and strength, its plastici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02
CPCC22C23/02
Inventor 王峰孙士杰刘正毛萍莉王志
Owner SHENYANG POLYTECHNIC UNIV
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