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Al—Zn—Mg系合金中,Zn、Mg是控制时效硬化过程的主要元素。在合金中,Zn、Mg含量增加,合金的强度随之增加,当Zn、Mg总含量达11～12%时,可获得最高抗拉强度,但合金的塑性大大下降。zn、Mg总含量<8%,zn、Mg的比值<2时,合金的结晶范围小,低熔点共晶较少,是合金组织与性能的满意结合。Al—Zn—Mg系合金的淬火敏感性低,为其淬火加热规范的选择提供了
Al-Zn-Mg alloys, Zn, Mg are the main elements controlling the age-hardening process. In the alloy, the content of Zn and Mg increases, the strength of the alloy increases. When the total content of Zn and Mg reaches 11-12%, the highest tensile strength can be obtained, but the plasticity of the alloy decreases greatly. zn, the total content of Mg is less than 8% and the ratio of zn and Mg is less than 2, the alloy has a small range of crystallization and less eutectic of low melting point, which is a satisfactory combination of the microstructure and properties of the alloy. Al-Zn-Mg alloy quenching sensitivity is low, for its selection of quenching and heating provided