Precipitation sequence and hardening effect in 7A85 aluminum alloy

被引：30
作者：
Chen, Zhongwei [1 ]
Yan, Kang [1 ]
Ren, Congcong [1 ]
Naseem, Sufyan [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 875卷
基金：
中国国家自然科学基金;
关键词：
Al-Zn-Mg-Cu alloy; Aging; HRTEM; Precipitation sequence; Hardening effect; MG-CU ALLOY; MECHANICAL-PROPERTIES; GP-ZONES; BEHAVIOR; ETA'; MICROSTRUCTURE; PHASE; ATOM;
D O I：
10.1016/j.jallcom.2021.159950
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The precipitation hardening effect and a detailed precipitation sequence for the Al-Zn-Mg-Cu (7A85) alloy during its artificial aging at 434 K were investigated by transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM) and microhardness testing. The precipitation sequence can be described as: supersaturated solid solution (SSSS) -> vacancy-rich clusters (VRC) -> GuinierPreston (GP-II) zones -> intermediate structures -> eta ' -> eta. We found that due to the influence of solute segregation, the evolution of grain boundary precipitates preceeds the formation of intragranular precipitates. The results show that the precipitation hardening of 7A85 aluminum alloy is mainly caused by a series of precipitates between GP-II and eta ' precipitates. (c) 2021 Elsevier B.V. All rights reserved.
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页数：10
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