The impact of solution time on the microstructure and properties of NiTip/6061 Al matrix composites fabricated by hot pressing and extrusion  

作　　者：Dong-Dong Zhuang Xin-Long Lian Hao-Di Li Shu-Hao Zhang Wang-Shi Yao Qian Wang 

机构地区：[1]School of Material Science and Engineering,Jiangsu University,Zhenjiang,212013,China [2]Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou,341000,China

出　　处：《Progress in Natural Science:Materials International》2024年第6期1304-1317,共14页自然科学进展·国际材料(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.52475461);2023 Ganzhou“Jiebangguashuai”Program(Grant No.2023ULGX 0002);the“JIANGXI DOUBLE THOUSAND PLAN”(Grant No.jxsq2023101058)

摘　　要：This study investigates the impact and underlying mechanisms of solution time on the microstructure and mechanical properties of Ni Ti particle-reinforced 6061 Al composites.The findings indicate that significant alterations occur in the interfacial reaction phase of the composites following treatment with varying solution times.As the solution time increases,the thickness of the interfacial reaction phase progressively increases.Furthermore,the interfacial reaction phase develops a double-layer structure,consisting of the Al Ti Si phase that tightly surrounds the Ni Ti particles and the discontinuously distributed Al3Ni phase.The exceptional tensile strength and elongation characteristics of the 6061 Al alloy are attained following a 6-min solution treatment,after which these properties remain relatively stable.The NiTip/6061 Al composites demonstrate their peak tensile strength of 380MPa and elongation of 17.1%subsequent to a 30-min solution treatment;however,both tensile strength and elongation exhibit a decline thereafter.The fracture surface of the composite reveals prominent toughness dimples,with portions of the Al matrix adhering to the surfaces of the Ni Ti particles.This observation indicates a robust bonding relationship between the Al matrix and the Ni Ti particles,which can be attributed to the uniform distribution of the Al Ti Si phase.Beyond a solution treatment duration of 30 min,the toughness dimples on the fracture surface diminish,and the Al matrix adhering to the Ni Ti particle surfaces gradually decreases due to the development of an increasingly uneven and coarse Al3Ni interface reaction phase as the solution time is extended.

关 键 词：Al matrix composites NiTi particles Microstructure Interface reaction phase Mechanical properties 

分 类 号：TG376.2[金属学及工艺—金属压力加工] TB331[一般工业技术—材料科学与工程]