Effect of magnetic field on dislocation morphology and precipitation behaviour in ultrafine-grained 7075 aluminium alloy

被引：33
作者：
Luo, Jun [1 ,2 ]
Luo, Hongyun [1 ,2 ,3 ]
Zhao, Tianshu [1 ,2 ]
Wang, Runze [1 ,2 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Mat & Performance, Beijing 100191, Peoples R China
[2] Beihang Univ, Beijing Key Lab Adv Nucl Mat & Phys, Beijing 100191, Peoples R China
[3] Beihang Univ, Beijing Adv Innovat Ctr Biomed Engn, Beijing 100191, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2021年 / 93卷
基金：
中国国家自然科学基金;
关键词：
Ultrafine-grained Al alloy; Precipitation behaviors; Magnetic field; Dislocation morphology; Critical temperature; MG-CU ALLOY; ENHANCED MECHANICAL-PROPERTIES; MICROSTRUCTURAL EVOLUTION; DYNAMIC PRECIPITATION; AGING BEHAVIOR; STRENGTH; REFINEMENT; TEXTURE; TEMPERATURE; DUCTILITY;
D O I：
10.1016/j.jmst.2021.03.016
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of magnetic field (1 T) on dislocation morphology and precipitation behaviour of ultrafine-grained (UFG) Al 7075 alloy was investigated after ageing from 90 to 200 degrees C via wide angle X-ray scattering (WAXS), small angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). Experimental results reveal that the improved precipitation kinetics of alloys in the thickness plane (denoted as sample II) as compared to those in the rolling plane (denoted as sample I), which arises due to a higher dislocation density (morphology of dislocation cells) of the thickness plane than that of the rolling plane (morphology of dislocations and dislocation tangles). Specifically, because of different dislocation morphologies, the magnetic field positively and negatively affects the dislocation activity in samples I and II, leading to enhanced and suppressed precipitation behaviors, respectively. Interestingly, nucleation of the eta' phase is facilitated in the UFG alloy at the critical temperature (140 degrees C) because it affords a faster rate of atom diffusion and a higher dislocation density as compared to those exhibited by its coarse-grained alloy. This systematic and comprehensive study provides new insights into dislocation morphology and precipitation behaviour of the UFG 7075 Al alloy, while enabling the optimization of precipitation kinetics. (C) 2021 Published by Elsevier Ltd on behalf of Chinese Society for Metals.
引用
收藏
页码：128 / 146
页数：19
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