采用硬度法测定了一种新型Al-Zn-Mg-Cu合金挤压带板的G,P区临界形核温度Tv(GP区在此温度下形核不依靠空位浓度)和Tc(GP区在此温度以上不能形核).他们的温度区间分别为130～140℃和170～180℃.依据实验结果确定了合金的一级时效温度为120℃,二级时效温度为165℃.合金在120℃/4h+ 165℃/8h制度下热处理后,L向的抗拉强度、屈服强度、伸长率、断裂韧度和电导率分别为617MPa,590MPa,13.5％,41.6MPa√m和39.1％IACS,是一种综合性能优良的双级时效600MPa级铝合金.
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