Influence of natural aging and pre-treatment on the precipitation and age-hardening behavior of Al-1.0Mg-0.65Si-0.24Cu alloy

被引：23
作者：
Jin, Shuoxun [1 ]
Ngai, Tungwai [1 ]
Li, Liejun [1 ]
Lai, Yuxiang [2 ]
Chen, Zimo [1 ]
Wang, Andi [3 ]
机构：
[1] South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Technol, Guangzhou 510640, Guangdong, Peoples R China
[2] Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Hunan, Peoples R China
[3] South China Univ Technol, Analyt & Testing Ctr, Guangzhou 510640, Guangdong, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 742卷
基金：
中国国家自然科学基金;
关键词：
Al-Mg-Si-Cu alloy; Pre-treatment; Age-hardening behavior; Transmission electron microscopy; MG-SI ALLOY; CU ALLOY; CRYSTAL-STRUCTURE; PHASE; DEFORMATION; IMPROVE; BETA''; TEMPERATURES; SEQUENCE; REVERSAL;
D O I：
10.1016/j.jallcom.2017.10.005
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：
Replacing steel plate with aluminum alloy as automotive structural parts is a cost-effective way to reduce body weight. The effect of 5% deformation thorn pre-aging treatment (170 degrees C, 190 degrees C, 210 degrees C for 10 min) on natural aging, subsequent artificial age-hardening of an Al-1.0Mg-0.65Si-0.24Cu alloy were studied by hardness measurement, differential scanning calorimetric (DSC), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM) analysis. The formation of clusters induced by natural aging decrease the size and density of beta '' phase during subsequent artificial aging, which results in a decline of peak-aging hardness. The immediate pre-treatment after quenching completely suppressed the negative effect of natural aging. In addition, it significantly increased the peak-aging hardness (higher than T6 peak-aging condition) and shortened the time (by 50%) to reach peak hardness of the alloy during subsequent artificial aging. The pre-treatment generated the beta ''-nuclei to be readily transform into beta '' phase during artificial aging. The two types of disordered precipitates formed during the pre-treatment continued to grow with the process of subsequent artificial aging and played an important part in strengthening the alloy. (c) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：852 / 859
页数：8
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