Atomic-level insights on enhanced strength and ductility of Al-Mg-Si alloys with fl"-Mg5Si6 at cryogenic temperatures

被引：3
作者：
Lei, Gang [1 ,2 ]
Gao, Hai-tao [1 ,2 ,3 ]
Zhang, Yun [1 ,2 ]
Cui, Xiao-hui [1 ,2 ,3 ]
Yu, Hai-lian [1 ,2 ,3 ]
机构：
[1] Cent South Univ, Sch Mech & Elect Engn, Changsha 410083, Peoples R China
[2] Cent South Univ, State Key Lab Precis Mfg, Extreme Serv Performance, Changsha 410083, Peoples R China
[3] Cent South Univ, Light Alloy Res Inst, Changsha 410083, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2023年 / 33卷 / 10期
基金：
中国国家自然科学基金;
关键词：
molecular dynamics; aluminum alloy; beta' phase; strength; ductility; cryogenic temperature; MECHANICAL-PROPERTIES; CRYSTAL-STRUCTURE; MG17AL12; PRECIPITATE; YIELD STRENGTH; BETA'' PHASE; MICROSTRUCTURE; DEFORMATION; ALUMINUM; CU; DEPENDENCE;
D O I：
10.1016/S1003-6326(23)66309-5
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The influences of fl '' phase volume fractions (PVF) and cryogenic temperatures on nanomechanical properties of Al-Mg-Si alloys were simulated by molecular dynamics. The simulation results show that when the beta' ' PVF is 0.107 at 77 K, the peak stress of Al-Mg-Si alloy is increased by 97.05% compared to that of pure aluminum. When the beta' ' PVF is 0.107, the peak stress of the sample at 27 K is increased by up to 23.55% compared to peak stress of sample at 300 K. Cryogenic environments help to enhance total dislocation density, allowing samples to withstand greater stress, which can provide additional strength and ductility. Temperature decrease can also appreciably inhibit the initiation and growth of voids (growth rate is decreased by 88.5% at 27 K), which contributes to the enhanced ductility.
引用
收藏
页码：2943 / 2954
页数：12
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