Strength-plasticity matching regulation of cold rotary forged Al5A06 sheets by annealing treatment and its influence on fatigue property  

作　　者：Xuan Hu Xinghui Han Lin Hua Fang Chai Wuhao Zhuang Fangyan Zheng Fei Yin Xiaokai Wang 

机构地区：[1]Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan 430070,PR China [2]Hubei Longzhong Laboratory,Xiangyang 441000,PR China

出　　处：《Journal of Materials Science & Technology》2024年第25期123-148,共26页材料科学技术(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(no.U21A20131);the Innovative Research Team Development Program of Ministry of Education of China(no.IRT17R83)for the support given to this research.

摘　　要：Al5A06 sheets by large cold plastic deformation usually have high strength but low plasticity,i.e.weak strength-plasticity matching,which may lead to their poor fatigue property.In this study,annealing treat-ments are applied on cold rotary forged Al5A06 sheets to regulate strength-plasticity matching and im-prove fatigue properties.The microstructures,tensile mechanical properties and fatigue properties un-der different annealing parameters were analyzed.The abnormal grain growth mechanism of cold rotary forged Al5A06 sheets during 300℃ annealing treatment was investigated,and the fatigue failure mech-anism of Al5A06 sheets with different annealing temperatures was also investigated.The abnormal grain growth during 300℃ annealing treatment is mainly due to the asynchronous recrystallization behavior with low recrystallization driving force,which leads to the early recrystallized regions directly absorb-ing adjacent grains along134crystal direction.The cold rotary forged Al5A06 sheets after 250℃-2 h annealing treatment exhibit the best fatigue property,which is mainly because the optimum strength-plasticity matching brings about coordinate plastic deformation throughout most grains,and the effective dislocation movement between adjacent grains can delay the appearance of strain localization and ac-commodate continuous fatigue cyclic loading.

关 键 词：Al5A06 sheets Cold rotary forging Annealing treatment Strength-plasticity matching Fatigue property 

分 类 号：TG1[金属学及工艺—金属学]