Near-microscopic grain boundary facilitates fatigue crack propagation in a polycrystalline Al–Zn–Mg–Cu alloy
作者机构：State Key Laboratory of Nonferrous Metals and Processes China GRINM Group Co. LTD. GRIMAT Engineering Institute Co. LTD. General Research Institute for Nonferrous Metals Southwest Aluminum(Group) Co. Ltd.
出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))
年 卷 期：2023年第33卷第1期
页 面：120-125页
核心收录：
学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学]
基 金：financially supported by the National Key R&D Program of China (No. 2021YFC1910505)
主 题：Fatigue crack propagation Grain size Grain boundary Cyclic plastic zone Al–Zn–Mg–Cu alloy
摘 要：In present study, grain characteristics with sizes within 10–30 μm were fabricated from a same Al–Zn–Mg–Cu alloy, FCP behaviors of the alloys with small grain(SG alloy), medium grain(MG alloy) and large grain(LG alloy)were investigated and related fatigue fracture morphology was analyzed. With the enhancement of stress intensity factor range(ΔK), the alloy with larger grains possessed faster FCP rate, which were successively arranged as SG alloy MG alloy LG alloy at initial stage while turned to LG alloy MG alloy SG alloy at final stage for the stable expanding region. Except for conventional characteristics of striations, tearing ridges, secondary cracks,second phases, voids and dimples, more prominent grain boundary features appeared on fracture surface, especially for MG and LG alloy. The calculation of cyclic plastic zone(CPZ) sizes proved that grain boundary participated and promoted FCP behavior when CPZ covered grain and grain boundary together.
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