石磊,刘崇宇,肖济金,孙浩鸣,张磊

• 1:桂林理工大学材料科学与工程学院

摘要(Abstract)：

对固溶态7055铝合金分别进行常规自然时效、人工时效处理及120℃温轧后自然时效和人工时效热处理。采用光学显微镜、扫描电镜、透射电镜和万能力学实验机等研究了各状态下合金的微观结构和性能。结果表明：自然时效和人工时效处理的7055铝合金都有纳米析出相析出，人工时效样品的屈服强度及抗拉强度分别提高至625 MPa和695 MPa;温轧可以将大晶粒破碎，同时会促使7055铝合金内产生大量位错，并发生缠结。此外温轧会降低后续热处理过程中强化相析出所需的能量，促进其析出。固溶-温轧-人工时效工艺所制备的7055铝合金兼具细晶强化、析出强化及位错强化效应，其屈服强度和抗拉强度分别达到659 MPa和723 MPa,高于合金经过常规T6处理后的强度。

关键词(KeyWords)： 7055铝合金;温轧;时效处理;微观组织;析出相

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52161004);; 广西自然科学基金(2022GXNSFAA035580)

作者(Author): 石磊,刘崇宇,肖济金,孙浩鸣,张磊

DOI: 10.13289/j.issn.1009-6264.2021-0598

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