Heat-resistant magnesium alloy

A magnesium alloy, heat resistance technology, applied in the field of heat resistant magnesium alloy, can solve problems such as insufficient strength or heat resistance

Inactive Publication Date: 2010-02-17
TOYOTA IND CORP
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  • Abstract
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  • Application Information

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Problems solved by technology

However, magnesium alloys are not sufficient in strength or heat resistance depending on the application, so further improvement in characteristics is required

Method used

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Embodiment Construction

[0028] The best mode for carrying out the heat-resistant magnesium alloy (hereinafter referred to as "magnesium alloy") of the present invention will be described below.

[0029] The magnesium alloy of the present invention contains magnesium (Mg), the first alloy element M1, the second alloy element M2, and calcium (Ca) as main components, and has plate-shaped precipitates containing Mg crystal grains and precipitated into the particles of the Mg crystal grains , the metallic structure of grain boundary crystallized matter crystallized at the grain boundaries of the Mg crystal grains and forming a microscopically continuous network.

[0030] In the magnesium alloy of the present invention, plate-like precipitates exist in Mg crystal grains. Plate-shaped precipitates hinder dislocation movement in Mg crystal grains. The deformation of the crystal occurs by the movement of dislocations on the sliding plane. Therefore, it may be a plate-shaped precipitate parallel to the c-pla...

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Abstract

A heat-resistant magnesium alloy comprising Mg as a main component; at least any one selected from among Al and Ni as a first alloy element (M1); at least any one selected from among Mn, Ba, Cr and Feas a second alloy element (M2); and Ca. This heat-resistant magnesium alloy has a metallographic structure containing Mg crystal grains; platelike precipitates having precipitated within the Mg crystal grains; and grain boundary crystallizates having crystallized at boundaries of the Mg crystal grains and forming a microscopically continuous network. By virtue of the presence of the platelike precipitates within the Mg crystal grains, the transfer of dislocation within the Mg crystal grains is blocked to thereby restrict any deformation. Further, by virtue of the microscopically continuous presence of network forming grain boundary crystallizates at boundaries of the Mg crystal grains, the grain boundary strength is enhanced. This magnesium alloy having its Mg crystal grain interiors andboundaries simultaneously strengthened retains high mechanical properties even in high temperature region.

Description

technical field [0001] The present invention relates to a heat-resistant magnesium alloy that can withstand high-load use at high temperatures. Background technique [0002] Magnesium alloys, which are lighter than aluminum alloys, are widely used as aircraft materials, vehicle materials, and the like from the viewpoint of weight reduction. However, magnesium alloys are not sufficient in strength or heat resistance depending on the application, so further improvement in characteristics is required. [0003] Therefore, JP-A-2004-162090 and JP-A-2004-232060 disclose magnesium alloys containing appropriate amounts of calcium (Ca) and aluminum (Al). In these documents, since the Ca—Al compound or the Mg—Ca compound crystallizes or precipitates to the grain boundaries of the Mg crystal grains of the magnesium alloy, the movement of dislocations is suppressed. As a result, the magnesium alloy exhibits less creep deformation in a high-temperature region and exhibits excellent hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00
CPCC22C23/00C22C23/02
Inventor 杉江尚木下恭一谷泽元治三好学
Owner TOYOTA IND CORP
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