采用光学金相、示差扫描量热分析、扫描电镜、室温拉伸及断裂韧性实验,研究多级固溶处理对7050铝合金强度和断裂韧性的影响.结果表明:7050铝合金厚板经多级强化固溶后,随最后一级温度的增加,可溶性粗大第二相减少,其强度和断裂韧性增加,当最后一级温度为493℃时,合金的断裂韧性和强度达到峰值,其断裂韧性(K1c)、屈服强度(ō0.2)和抗拉强度(ōb)分别为37.4 MPa·m1/2、500.6 MPa和534.0 MPa；当最后一级温度超过493℃时,由于再结晶分数急剧增加、晶粒快速长大,断裂韧性和强度又逐渐降低；当多级固溶最后一级的温度和时间与单级固溶一致时,经多级强化固溶后的7050铝合金具有比单级固溶时更高的断裂韧性和强度.
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