Effects of Zn addition on the age hardening behavior and precipitation evolution of an Al-Mg-Si-Cu alloy

被引：49
|
作者：
Zhu, Shang [1 ]
Li, Zhihui [1 ]
Yan, Lizhen [1 ]
Li, Xiwu [1 ]
Huang, Shuhui [1 ]
Yan, Hongwei [1 ]
Zhang, Yongan [1 ]
Xiong, Baiqing [1 ]
机构：
[1] Gen Res Inst Nonferrous Met, State Key Lab Nonferrous Met & Proc, Beijing 100088, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2018年 / 145卷
基金：
国家重点研发计划;
关键词：
Al-Mg-Si-Cu alloy; Zn-containing; Age hardening; Precipitation evolution; ATOM-PROBE TOMOGRAPHY; CRYSTAL-STRUCTURE; PHASE; QUANTIFICATION; PARTICLES;
D O I：
10.1016/j.matchar.2018.08.051
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of Zn on the age hardening behavior and corresponding microstructure of an Al-0.9Mg-0.8Si-0.2Cu (wt%) alloy were investigated by hardness testing, transmission electron microscopy (TEM) and three-dimensional atom probe (3DAP). During aging for up to 8 h at 170 degrees C (peak hardness condition), the addition of Zn does not alter the precipitation sequence of the Al-Mg-Si alloy, which can be expressed as: supersaturated solid solution -> solute clusters -> GP zones -> beta ''. The Zn does not significantly partition into clusters or precipitates, and the majority of Zn remains in the Al matrix, prompting the formation of solute clusters during the early stage of aging and subsequently stimulating the transformation from solute clusters to GP zones to beta '' precipitates. The characterization of precipitation evolution caused by Zn addition correlates well with the observed enhanced age hardening response.
引用
收藏
页码：258 / 267
页数：10
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