Effect of void nucleation on microstructure and stress state in aluminum alloy tailor-welded blank
Effect of void nucleation on microstructure and stress state in aluminum alloy tailor-welded blank作者机构：State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Key Laboratory of High Performance Manufacturing for Aero Engine (Northwestern Polytechnical University) Ministry of Industry and Information Technology
出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))
年 卷 期：2021年第31卷第1期
页 面：77-85页
核心收录：
学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0702[理学-物理学] 080201[工学-机械制造及其自动化]
基 金：support from the National Science Fund for Distinguished Young Scholars of China (51625505) the Key Program Project of the Joint Fund of Astronomy and National Science Foundation of China (Project U1537203) the Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China (Grant No. 2019TZ-02)
主 题：Aluminum alloy Welded joint Void nucleation Microstructure Stress state Micromechanical model
摘 要：The microscopic damage initiation characteristic in welded joint greatly determines the subsequent damage evolution and fracture behavior of aluminum alloy tailor-welded blank(TWB) during plastic forming. In this study, the interactive dependence of void nucleation on microstructure and stress state in the welded joint of a2219 aluminum alloy TWB was quantitatively explored by in-situ SEM testing. Moreover, a micromechanical model based on actual microstructure was adopted to reveal the underlying mechanisms from the perspective of microscopic heterogeneous deformation. The results showed that three void nucleation mechanisms, including particle-cracking, interface-debonding and matrix-cracking, coexisted in the deformation at different microstructure regions and stress states. The nucleation strain of each mechanism mainly depended on the particle volume fraction, grain size and stress triaxiality. Besides, the proportions of particle-cracking and interfacedebonding greatly varied with the grain size and particle volume fraction, and the variation law changed with the stress state. The proportion of matrix-cracking had a weak dependence on the microstructure, while increased with the stress triaxiality decreasing. It made the damage initiation in aluminum alloy welded joint transit from particle-cracking dominance to matrix-cracking dominance with the stress triaxiality *** micromechanical modeling results suggested that the changes of evolutions and distributions of Mises stress in particle, hydrostatic stress at interface and plastic strain in matrix with microstructure and stress state were responsible for the above effects.
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