文献类型：期刊文献

英文题名：The influence of precipitation on plastic deformation in a high Mg-containing AlMgZn-based crossover alloy: Slip localization and strain hardening

作者：Zhang, Xiuzhen[1];Yang, Chao[2];Meng, Lei[1];Chen, Zhenghao[3];Gong, Wu[4];Sun, Binhan[5];Zhao, Shiteng[6];Zhang, Deliang[1];Li, Yue[7];Zhou, Dengshan[1]

机构：[1]Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China;[2]Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formin, Shanghai 200240, Peoples R China;[3]Kyoto Univ, Dept Mat Sci & Engn, Sakyo Ku, Kyoto 6068501, Japan;[4]Japan Atom Energy Agcy, J PARC Ctr, Ibaraki 3191195, Japan;[5]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[6]Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China;[7]Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

年份：2024

卷号：173

外文期刊名：INTERNATIONAL JOURNAL OF PLASTICITY

收录：;EI(收录号：20240515477825);WOS:【SCI-EXPANDED(收录号:WOS:001173166200001)】；

基金：Dengshan Zhou acknowledges the financial support from the Natural Science Foundation of China (Grant No. 51701036) , the Fundamental Research Funds for the Central Universities (Grant No. N2302013) , the Open Research Funds of Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming (Grant No. 202307012) and the research fellowship sponsored by the Alexander von Humboldt Foundation. Yue Li acknowledges the research fellowship provided by the Alexander von Humboldt Foundation. Binhan Sun acknowledges the financial support from the National Natural Science Foundation of China (Grant No. 52275147) . We thank U. Tezins, A. Sturm, and C. Bross, 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：Al alloys; Strengthening mechanisms; Dislocation-precipitate interactions; Slip mechanisms; Strain localization; Hetero-deformation-induced hardening; Strain hardening

摘要：The distribution and partitioning of solute atoms in age-hardenable aluminum (Al) alloys markedly impact strength, ductility and failure of alloy materials, thus rendering the understanding of dislocation -obstacle (solute -rich features) interactions crucial in the development of a new class of heat -treatable Al alloys. Here, we investigate the slip mechanisms, strain localization and strain hardening of a high Mg -content (>= 6 wt. %) lightweight AlMgZn-based crossover alloy aged to different conditions with the focus on the dislocation -obstacle interactions. It is found that due to different elemental partitioning between matrix and solute -rich features the interaction of dislocations with obstacles can be drastically different for samples with varying precipitates. The dislocations in the under -aged and near peak -aged samples show predominantly planar slip, which produces strain localization. Whereas in the over -aged sample, gliding dislocations initially bend between adjacent precipitates lying in the slip planes, and subsequently surmount them by local cross slip processes, giving rise to homogeneous slip. Through analyzing the intrinsically different strain hardening ability and characterizing deformation -induced specific dislocation configurations in the solution -treated and aged samples, it is discovered that strain localization in the form of coarse slip bands induces strain hardening in the under -aged material. To understand the enhanced strain hardening observed in the under -aged sample, four key influencing factors are proposed. In addition, the predicted yield strengths for the solution -treated and artificially aged materials match well with those experimentally measured values. The experimental results demonstrated in the current study not only apply for the microstructure design of highperformance age-hardenable Al -based alloys, they also provide new insights into understanding of general precipitation -hardened metallic alloys.