Heat resistant magnesium alloy

Abstract

The invention discloses a heat resistant magnesium alloy, which comprises the following components in percentage by weight: 1.5 to 6.0 percent of Al, 0.15 to 0.25 percent of Zn, 0.5 to 3.0 percent of Si, 0.1 to 0.8 percent of Ca, 0.1 to 0.5 percent of Sr and the balance of Mg. The magnesium alloy has the tensile strength and the elongation of more than 128MPa and 7.8 percent at room temperature respectively, and has the tensile strength and the elongation of more than 120MPa and 20 percent at the temperature of 150 DEG C respectively. The tensile strength is improved by over 15 percent and the elongation is improved by over 10 percent under the same condition when the magnesium alloy is compared with a contrastive example. The heat resistant magnesium alloy has good texture and performance, particularly high-temperature resistance, and is suitable for industries, such as vehicles and 3C.

Description

Technical field: [0001] The invention relates to an alloy, in particular to a magnesium alloy. Background technique: [0002] Magnesium alloy has the advantages of low density, high specific strength and specific stiffness, and recyclability, and has become the material of choice for industries such as automobiles and 3C. However, magnesium alloys are far less useful than aluminum alloys, one of the reasons being their poor heat resistance. When the ambient temperature exceeds 120°C, its strength decreases rapidly. limited its scope of application. [0003] At present, research on heat-resistant magnesium alloys at home and abroad mainly focuses on Mg-Al alloys with high temperature creep resistance. Typical representatives of heat-resistant magnesium alloys are AS series (Mg-Al-Si), AE series (Mg-Al-RE) and AZ series (Mg-Al-Zn). [0004] AS series alloy is a kind of die-casting magnesium alloy which is more commonly used at present. Compared with the commonly used AZ s...

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Problems solved by technology

[0005] Although AS series alloys have high high temperature performance, their popularization and application are still limited to a certain extent, mainly due to: ① the high temperature strengthening phase Mg formed by Si in the alloy 2 Si often appears in the form of thick Chinese character blocks, and Mg when subjected to stress 2 There is a large stress concentration around the Si particles, resulting in the initiation and expansion of microscopic voids, and as the temperature increases, the voids will increase, which will seriously damage the performance of the alloy; ② For every 1% increase in Si, Mg 2 The liquidus temperature of the Si alloy increases by about 40°C, resulting in poor fluidity of the alloy and a decrease in the die-casting process performance of the alloy; 2 Si phase is formed, so it cannot be used in processes such as sand casting

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