通过DSC、XRD、TEM、硬度测试和拉伸测试等手段,研究了2A97铝锂合金时效组织和性能变化.结果表明:2A97合金淬火后在165℃时效18 h的显微组织以θ″/θ′和δ′相为主,出现了大量分布不均匀T1相.在165℃时效,随时间延长,T1数量密度增加,平均长度减小,δ′数量密度增加,θ′数量密度和长度增加.在165℃时效18 h得到较高的强度和塑性.淬火变形后于135℃时效的组织以细小θ″/θ′、T1和δ′为主,T1和θ″/θ′数量明显高于未变形时效组织.淬火变形后于135℃时效36 h的强度明显提高,σ0.2,σb和δ5分别为441 MPa,519 MPa和7.4%.
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