Heat treatment method for improving toughness of die-casting magnesium alloy

A heat treatment method and toughness technology are applied in the field of heat treatment to improve the strength and toughness of die-casting magnesium alloys, which can solve the problems of high cost, limited strength and toughness, and limited application scope, and achieve the effect of preventing grain coarsening and improving strength and toughness.

Inactive Publication Date: 2017-06-09
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the Mg-Al alloy is currently the most widely used die-casting magnesium alloy, but its limited strength and toughness limit its application to a certain extent.
Rare earth elements can effectively improve the strength and toughness of alloys, but the cost is too high to be suitable for commercial production, so the choice of alloying elements needs to be considered in terms of cost and performance

Method used

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  • Heat treatment method for improving toughness of die-casting magnesium alloy
  • Heat treatment method for improving toughness of die-casting magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Put the Mg-7Al-1Ca-0.5Sn alloy prepared by vacuum die-casting into a heat treatment furnace for a heat treatment. The temperature of the first heat treatment is 380°C, and the furnace is installed at room temperature. The heating rate is 3°C / min, and the time of the first heat treatment is 13h; complete After one heat treatment, the samples were taken out and cooled in air. Put the sample into a heat treatment furnace for secondary heat treatment. The temperature of the secondary heat treatment is 190°C, the furnace is installed at room temperature, the heating rate is 3°C / min, and the time of the secondary heat treatment is 14h. After the secondary heat treatment, the sample is taken out and air-cooled. The resulting alloy has a yield strength of 155.4MPa, a tensile strength of 293.9MPa, and an elongation of 12.84%.

Embodiment 2

[0037] Put the Mg-7Al-1Ca-0.5Sn alloy prepared by vacuum die-casting into a heat treatment furnace for a heat treatment. The temperature of the first heat treatment is 400 ° C, the furnace is installed at room temperature, the heating rate is 5 ° C / min, and the time of the first heat treatment is 16 h; After one heat treatment, the samples were taken out and cooled in air. Put the sample into the heat treatment furnace for the second heat treatment, the temperature of the second heat treatment is 210°C, the furnace is installed at room temperature, the heating rate is 5°C / min, and the time of the second heat treatment is 18 h; after the second heat treatment, the sample is taken out and air-cooled . The resulting alloy has a yield strength of 148.5MPa, a tensile strength of 288.9MPa, and an elongation of 12.5%.

Embodiment 3

[0039] Put the Mg-7Al-1Ca-0.5Sn alloy prepared by vacuum die-casting into a heat treatment furnace for a heat treatment. The temperature of the first heat treatment is 390°C, the furnace is installed at room temperature, the heating rate is 4°C / min, and the time of the first heat treatment is 15h; complete After the first heat treatment, take out the sample and air-cool; put the sample into a heat treatment furnace for the second heat treatment, the temperature of the second heat treatment is 200°C, install the furnace at room temperature, the heating rate is 4°C / min, and the time of the second heat treatment is 15h; After the secondary heat treatment, the samples were taken out and cooled in air. The resulting alloy has a yield strength of 178.2MPa, a tensile strength of 306.8MPa, and an elongation of 13.8%. The tensile mechanical properties of vacuum die-casting Mg-7Al-1Ca-0.5Sn alloy before and after heat treatment are as follows: figure 1 shown. Microstructure of Mg-7Al...

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Abstract

Aiming at the disadvantage of poor toughness of die-casting Mg-Al alloy, the invention provides a heat treatment method for improving the toughness of vacuum die-casting Mg-7Al-1Ca-0.5Sn alloy. Through primary heat treatment and secondary heat treatment performed on the vacuum die-casting Mg-7Al-1Ca-0.5Sn alloy, alloy components can be more uniform, the tissue and shape are obviously improved, the quantity of precipitated phases is increased, the precipitated phases are diffused on a base body, obvious growing of crystalline grains does not exist, and the mechanical property of the alloy is obviously improved. After the vacuum die-casting Mg-7Al-1Ca-0.5Sn alloy is subjected to the primary heat treatment and secondary heat treatment, the room temperature tensile strength is 288.9 to 306.8MPa, the yield strength is 148.5 to 178.2MPa, and the elongation percentage is 12.5 to 13.8 percent. The performance index of the alloy is obviously better than that of commercial AZ91 alloy and AM60 alloy.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a heat treatment method for improving the strength and toughness of die-casting magnesium alloys. Background technique [0002] In recent years, environmental and energy issues have become the focus, and magnesium alloy, as the lightest metal structure material, has become a research hotspot. Among them, the Mg-Al alloy is currently the most widely used die-casting magnesium alloy, but its limited strength and toughness limit its application scope to a certain extent. Rare earth elements can effectively improve the strength and toughness of alloys, but the cost is too high to be suitable for commercial production. Therefore, the choice of alloying elements needs to balance cost and performance. In addition, the performance of most magnesium alloys is greatly affected by the second phase. On the basis of ensuring the density of the die casting, the morphology, distribution and quan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
CPCC22F1/06
Inventor 王峰高艺王威王志董海阔毛萍莉刘正
Owner SHENYANG POLYTECHNIC UNIV
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