张林,张豪,朱玉桂

• 1:上海交通大学金属基复合材料国家重点实验室

摘要(Abstract)：

采用全自动控制往复喷射成形工艺制备了Ф360 mm×1200 mm工业规格7475铝合金喷射成形坯。采用常规力学性能和电导率测试,应用光学显微镜、扫描电镜和透射电镜观察微观组织,研究了沉积态、挤压态和热处理状态下喷射成形7475铝合金组织和性能的演变。结果表明,沉积态组织为等轴晶,粒度宏观均匀,晶粒尺寸在30~40μm,无明显宏观偏析,致密度达97%,强度比传统铸造合金提高63.6%;热挤压后,孔隙基本消除,比传统铸造合金强度提高45.5%,伸长率提高25.3%。T6处理后,强度为738 MPa,电导率为39.4%IACS,比传统铸造合金强度提高33.0%,电导率提高9.4%;双级时效降低合金强度,提高电导率;回归再时效处理后,强度为716 MPa,电导率达43.3%IACS,能使合金获得优异的综合性能。

关键词(KeyWords)： 喷射成形;沉积态;热挤压;固溶;时效

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 张林,张豪,朱玉桂

DOI: 10.13289/j.issn.1009-6264.2014.12.013

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