Alkaline-earth heat insulating magnesium alloy for vehicle use and producing method thereof

Abstract

The heat resistant magnesium alloy for use in automobile has the components including Al 7-10 wt%, Zn 0.8-1.2 wt%, Mn 0.1-0.8 wt%, Ca 0.1-1.5 wt%, Sr 0.05-0.15 wt%, and Mg 88-91 wt%. During smelting, intermediate alloys Al-Ca and Al-Sr are added into magnesium alloy melt to increase Ca and Sr contents; and after smelting, the magnesium alloy is solid solution treated at 410 deg.c for 16-24 r and ageing treated at 180 deg.c for 16-40 hr to raise the strength. The heat resistant magnesium alloy is one kind of cast alloy with room temperature strength higher than that of AZ91 alloy, relatively high creep property at high temperature, high fire retarding performance, less interdendritic shrinkage and other casting faults and low cost, and is suitable for use in producing high temperature automobile parts.

Description

technical field

[0001] The invention relates to an alkaline earth heat-resistant magnesium alloy suitable for the automobile manufacturing industry and a preparation method thereof. Background technique

[0002] With the rapid development of the automobile industry and the increasing importance of environmental protection, reducing the fuel consumption and reducing CO 2 and other fuel oxides are becoming more and more urgent to the environment. As the lightest structural material, magnesium alloy has the advantages of high specific strength, excellent damping and shock absorption, heat dissipation, easy processing and recycling, etc. It is most suitable for many parts in the automotive industry, such as the gearbox housing of a car , intake manifold, crankcase, cylinder head and oil pan, etc., these components have been working under high temperature and high stress for a long time.

[0003] Commonly used cast magnesium alloys such as AZ91D, AM60, etc. have high strength a...

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