Effect of post heat treatment on microstructure, mechanical property and corrosion behavior of AlSi10Mg alloy fabricated by selective laser melting  

作　　者：Yang Zheng Zihao Zhao Ruize Xiong Guochun Ren Minghui Yao Wei Liu Libin Zang 

机构地区：[1]School of Aeronautics and Astronautics,Tiangong University,Tianjin,300387,China [2]School of Mechanical Engineering,Tiangong University,Tianjin,300387,China [3]D Printing Research&Engineering Technology Center,AECC Beijing Institute of Aeronautical Materials,Beijing,100095,China [4]Tianjin Institute of Aerospace Mechanical and Electrical Equipment,Tianjin,300301,China

出　　处：《Progress in Natural Science:Materials International》2024年第1期89-101,共13页自然科学进展·国际材料（英文版）

基　　金：supported by Tianjin Municipal Natural Science Foundation(23JCYBJC00040);Tianjin Research Innovation Project for Postgraduate Students(2022SKY134);National Natural Science Foundation of China(52175369)

摘　　要：The microstructure,mechanical property and corrosion behavior of the AlSi10Mg alloy fabricated by selective laser melting(SLMed-AlSi10Mg)after different post heat treatment(PHT)of direct aging(DA),solid solution(T4)and solid solution+aging(T6)were investigated.The microstructural characterization revealed that the porosity of the SLMed-AlSi10Mg was increased from 0.41±0.04%to 3.09±0.11%with increasing temperature.The Asbuilt and DA-treated samples exhibited a microstructure ofα-Al matrix surrounded with continuous Si networks,whereas the T4-treated and T6-treated samples presented a microstructure ofα-Al matrix surrounded with discrete Si particles.The microhardness,strength and work hardening rate of the SLMed-AlSi10Mg increased in the order of T4-treated sample<T6-treated sample<As-built sample<DA-treated sample(a reverse order was found for the elongation),which was due to the precipitation of nanoscale Si particles after DA treatment and the softening ofα-Al matrix after T4 and T6 treatments.The corrosion resistance of the SLMed-AlSi10Mg was obviously deteriorated after T4 and T6 treatments compared with DA treatment,which was caused by the changes in Si morphology,residual stress and porosity.

关 键 词：Selective laser melting AlSi10Mg alloy Post heat treatment Microstructure Mechanical property Corrosion behavior 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]