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Magnesium alloys

A magnesium alloy and alloy technology, applied in the field of magnesium alloy for casting, can solve the problems of fastening force reduction, affecting the dimensional accuracy of bolt fastening parts, etc.

Inactive Publication Date: 2007-10-24
茂木 彻一 +3
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  • Abstract
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Problems solved by technology

However, magnesium alloys such as AZ91D and AM60B suffer from creep deformation in an environment above 100°C, which affects the dimensional accuracy of the bolt fastening part, and there is a problem that the fastening force decreases.

Method used

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Embodiment Construction

[0028] In consideration of the balance between heat resistance, cost, and castability, the present inventors considered that adding elements beneficial to improving heat resistance based on Mg-Al alloys is a good strategy, and selected Cu as the element for improving heat resistance. Cu improves heat resistance without impairing room temperature strength and castability, and can be obtained at a lower price than RE. Cu can improve heat resistance by solid solution strengthening and compound formation in the structure. Here, the solid solution limit of Cu was examined by the ternary state diagram of Mg-Al-Cu, and it was found that when 8.0 wt% Al was added to Mg, Cu could be solid-dissolved to a maximum of 3.0 wt%. In addition, in the Mg-Al alloy, in order to improve castability and room temperature strength, the amount of Al added is 5.0 to 9.0% by weight. Therefore, in consideration of heat resistance and other characteristics, it is appropriate to add 5.0 to 9.0% by weight,...

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Abstract

A casting heat-resistance Mg alloy improved in heat resistance without relying upon expensive RE contains Cu. More specifically, it contains Al (8.0 weight %), Cu (1.0-5.0 weight %), Zn (2.0 weight %), Be (0.01 weight %) and Mg (the rest). The alloy can be prevented from deteriorating in corrosion resistance by adjusting the added amount of Cu to 1.0-1.5 weight %. The corrosion resistance of the alloy can be improved more by adding 0.5 to 1.0 weight % Mn as well.

Description

technical field [0001] The present invention relates to magnesium alloys, more particularly to magnesium alloys for casting. Background technique [0002] Magnesium (Mg) has a specific gravity of 1.74, about 2 / 3 of Al, and about 1 / 4 of Fe, and is the lightest of practical metals. Its specific strength, specific stiffness, electromagnetic shielding, thermal conductivity, dimensional stability and cutting Good performance, and has good properties such as reusability. Taking advantage of these characteristics, magnesium is used in the body of portable electronic devices such as mobile phones and notebook computers, which require light weight. In addition, in the automotive field, in order to achieve weight reduction, which is the most effective means for improving fuel efficiency, the development and practical use of automotive parts using magnesium alloys is being promoted. [0003] As typical magnesium alloys for casting, Mg-Al-Zn-based AZ91D alloy and Mg-Al-based AM60B all...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02
CPCC22C23/02
Inventor 茂木徹一田村洋介三幣裕喜夫
Owner 茂木 彻一
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