文献类型：期刊文献

英文题名：Microstructural evolution modelling and low-stress fatigue performance of bimodal-structured Al-Mg-Sc-Zr alloy produced by laser powder bed fusion additive manufacturing

作者：Huang, Guoqing[1,2];Shen, Tao[1,2];Li, Bo[1,2,3]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Addit Mfg & Intelligent Equipment Res Inst, Shanghai 200237, Peoples R China;[3]Shanghai Collaborat Innovat Ctr High End Equipment, Shanghai 200237, Peoples R China

年份：2024

卷号：19

期号：1

外文期刊名：VIRTUAL AND PHYSICAL PROTOTYPING

收录：;EI(收录号：20241816019519);WOS:【SCI-EXPANDED(收录号:WOS:001210800300001)】；

基金：This research work is sponsored by the National Natural Science Foundation of China (grant number 52175140), National Key R&D Program of China (grant number 2022YFB4602102), Fundamental Research Funds for Central Universities in China (grant number JKG01231610).

语种：英文

外文关键词：Laser powder bed fusion; bimodal-structure; cellular automaton; crystal plasticity finite element; fatigue; aluminum alloy

摘要：Coarse - and fine-grained bimodal-structures in a Al-Mg base alloy with rare earth elements of Sc/Zr is produced due to the ultrafast nonequilibrium solidification occurs in laser-induced molten pools during laser powder bed fusion (LPBF) additive manufacturing. A novel high-fidelity cellular automaton (CA) algorithm incorporating numerical calculations of molt-pool temperature fields elucidates the formation and evolution of the bimodal-structure. Subsequent heat treatment induces precipitation of Al3(Sc/Zr) particles within the grains, synergistically enhancing strength and plasticity of the LPBF-processed alloy. The crystal plastic finite element method (CPFEM) is used to reveal the synergistic effect between the strength and plasticity during the material tensile procedure. The bimodal-structure exhibits good fatigue resistance but intriguing anisotropy under low stress cyclic loading. It is proved that differentiated distribution patterns relative to the principal stress direction of the bimodal-structure have a significant influence on its fatigue performance. Numerical evolutionary of the bimodal grain deformation reflects this phenomenon.