采用洛氏硬度计、扫描电镜(SEM)和能谱技术(EDS)对经单级和二级固溶处理但未时效的ZAl7Si4CuMg合金试样性能和组织进行了实验研究.结果表明:在485℃单级固溶(0.5 ～16 h)处理下,固溶初始阶段硬度增加速度较快,当固溶时间8h时,硬度达到峰值(29 HRB),同铸态试样硬度相比提高了100％；在相同固溶时间(4 h)下,535℃单级固溶处理下的试样硬度低于485℃单级固溶处理下的硬度；二级固溶处理制度(485℃×6 h+535℃×4h)获得的试样硬度最高(31.6 HRB),分别比535℃×4h单级固溶处理试样和485℃下单级固溶处理峰值硬度高出35％和8.6％.
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