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对Al-10％Mg铸造合金在室温和150℃温度以下的时效和有关现象,通过拉伸试验和长达6年之久的金相检验作了研究。在含大于10.27％ Mg的合金中,在室温下时效,至少5年内其强度缓慢地但连续地增加。然而在50℃或高于此温度时,就不发生时效硬化,但有析出现象;首先在晶界上析出,性能无变化;然后在晶内呈魏氏体析出,随后迅速变脆。室温时效后的材料在50℃以上有回归现象。本文根据Al-Mg合金的现代研究和时效的现代理论讨论了这些结果。
The aging and related phenomena of Al-10% Mg cast alloys at room temperature and below 150 ° C were investigated by tensile testing and metallographic examination up to 6 years old. In alloys containing more than 10.27% Mg, their strength is slowly but continuously increased for at least 5 years at room temperature. However, at 50 ° C or above, age hardening did not occur, but precipitation occurred; first, precipitation occurred at the grain boundaries, with no change in properties; and then precipitated in the grains as W-shaped bodies and then quickly became brittle. After aging at room temperature above 50 ℃ in the regression phenomenon. This paper discusses these results based on the modern research of Al-Mg alloys and the modern theory of aging.