期刊
MATERIALS CHARACTERIZATION
卷 118, 期 -, 页码 438-445出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2016.06.023
关键词
RRA treatment; Microstructures; Fatigue crack propagation; Transgranular cracking
类别
资金
- National Key Fundamental Research Project of China [2012CB619506-3]
- National Natural Science Foundation of China [51171209]
- Program of Ministry of Education of China
A new retrogression and re-aging (RRA) treatment was designed to enhance the fatigue crack propagation (FCP) resistance of a superhigh strength Al-Zn-Mg-Cu alloy in this work. As compared to traditional RRA treatments, a lower retrogression temperature and a longer retrogression and re-aging time were employed. This modified RRA processing obtained a coarse precipitates in matrix, and a slightly increased precipitate free zone (PFZ) width at grain boundary. This led to an almost complete transgranular crack propagation, rather than a partial intergranular crack propagation as traditional RRA tempered samples. This kind of fatigue crack propagation manner gave rise to an ultralow FCP rate, comparable to fatigue resistant 2000 series aluminum alloy, in an Al-Zn-Mg-Cu alloy while keeping superhigh tension strength. (C) 2016 Elsevier Inc. All rights reserved.
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