Compressive response and microstructural evolution of in-situ TiB_(2)particle-reinforced 7075 aluminum matrix composite

作     者：Han WANG Hai-ming ZHANG Zhen-shan CUI Zhe CHEN Dong CHEN 王涵;章海明;崔振山;陈哲;陈东

作者机构：School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2021年第31卷第5期

页      面：1235-1248页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 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] 0813[工学-建筑学] 0814[工学-土木工程] 0702[理学-物理学] 

基　　金：the National Science and Technology Major Project of the Ministry of Science and Technology of China(No.2018-ZX04044001-008) the National Natural Science Foundation of China(No.52075328) 

主　　题：in-situ TiB2 particles aluminum matrix composite hot compression deformation particle fracture interface debonding dynamic recrystallization 

摘      要：The hot forming behavior,failure mechanism,and microstructure evolution of in-situ TiB_(2)particle-reinforced 7075 aluminum matrix composite were investigated by isothermal compression test under different deformation conditions of deformation temperatures of 300−450℃ and strain rates of 0.001^(−1)s^(−1).The results demonstrate that the failure behavior of the composite exhibits both particle fracture and interface debonding at low temperature and high strain rate,and dimple rupture of the matrix at high temperature and low strain *** dynamic recrystallization,which improves the composite formability,occurs under conditions of high temperature(450℃)and low strain rate(0.001 s^(−1));the grain size of the matrix after hot compression was significantly smaller than that of traditional 7075Al and ex-situ particle reinforced 7075Al matrix *** on the flow stress curves,a constitutive model describing the relationship of the flow stress,true strain,strain rate and temperature was ***,the processing maps based on both the dynamic material modeling(DMM)and modified DMM(MDMM)were established to analyze flow instability domain of the composite and optimize hot forming processing *** optimum processing domain was determined at temperatures of 425−450℃ and strain rates of 0.001−0.01 s^(−1),in which the fine grain microstructure can be gained and particle crack and interface debonding can be avoided.