文献类型：期刊文献

英文题名：Influence of Mg on tensile deformation behavior of high Mg-content Al-Mg alloys

作者：Zhou, Dengshan[1,2];Zhang, Xiuzhen[1];Wang, Hao[1];Li, Yue[2];Sun, Binhan[3];Zhang, Deliang[1,4]

机构：[1]Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China;[2]Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[4]Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China

年份：2022

卷号：157

外文期刊名：INTERNATIONAL JOURNAL OF PLASTICITY

收录：;EI(收录号：20223812759525);WOS:【SCI-EXPANDED(收录号:WOS:000919252400001)】；

基金：Dengshan Zhou is grateful for the financial support from the Natural Science Foundation of China (Grant No. 51701036), and the Fellowship from the Alexander von Humboldt Foundation, and Deliang Zhang acknowledges the financial support from the "Xing Liao Talent Plan" of Liaoning Province, China (Project No. XLYC1802080) to this work. Baptiste Gault is acknowledged for his stimulating discussion on APT results. We thank U. Tezins, A. Sturm, and C. Bro beta, for their technical support at the FIB and APT facilities at MPIE. Special thanks are due to the instrumental/data analysis from Analytical and Testing Center, Northeastern University.

语种：英文

外文关键词：High Mg-content Al-Mg alloys; Dynamic strain aging; Strain hardening; Dynamic recovery; Apparent activation volume

摘要：Al-Mg based alloys are known to experience dynamic strain aging (DSA) at room temperature, which is often associated with the diffusion of mobile Mg atoms to dislocation segments temporarily arrested at obstacles (e.g., forest dislocations) upon deformation in the DSA regime. With the emergence of new promising high Mg-content (> 6 wt.%) Al-Mg alloys, the combined effects of Mg content and DSA on their tensile flow behavior need to be better understood. In the present work, the tensile deformation behavior of Al and Al-(5.3, 6.4, 7.6 and 8.7) wt.% Mg samples tested at room temperature and at strain rates ranging from 0.0001 to 0.1 s(-1) was investigated, based on the Kocks-Mecking-Estrin model combined with a DSA model, the Haasen plot as well as transmission electron microscopy. Particular focuses are placed on the influence of Mg solutes on DSA and associated strain hardening effects, on dislocation accumulation and annihilation as well as on apparent activation volume. We show that the synergistic effect of the Mg-dislocation interactions and DSA effectively reduces the rate of dynamic recovery via suppressing dislocation cross-slip, leading to an enhanced strain hardening capacity for the Al-Mg alloys with a higher Mg content. The influences of DSA on the yield strength, flow stress and apparent activation volume of thermally-assisted deformation of the Al-Mg alloys are also discussed to elucidate fundamental insights into the development of new high Mg-content Al-Mg alloys with superior mechanical performance.