Development of Fe-Mn-Si-Cr-Ni shape memory alloy with ultrahigh mechanical properties and large recovery strain by laser powder bed fusion  

作　　者：Xiao Yang Lijin Cheng Huabei Peng Bingnan Qian Lei Yang Yunsong Shi Annan Chen Zhengyan Zhang Libin Zhao Ning Hu Chunze Yan Yusheng Shi 

机构地区：[1]State Key Laboratory of Materials Processing and Die and Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401,China [3]School of Mechanical Engineering,Sichuan University,Chengdu 610065,China [4]Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen 518055,China [5]School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430070,China [6]Department of Orthopaedics,Union Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan 430022,China

出　　处：《Journal of Materials Science & Technology》2023年第19期201-216,共16页材料科学技术（英文版）

基　　金：supported by the Chinese National Natural Science Fund (No.U1864208);the National Science and Technology Major Project (No.2017-VII-0011-0106);the Youth Science Fund Project of National Natural Science Foundation of China (No.52105396);the Postdoctoral Research Foundation of China (No.2020M682410);Postdoctoral Science and Technology Activity Program of Hubei Province (No.0106110134);the Project Supported by Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing (No.3DL202104);the Science and Technology Planning Project of Tianjin (No.20ZYJDJC00030);the Key Program of Research and Development of Hebei Province (No.202030507040009);the Fund for Innovative Research Groups of Natural Science Foundation of Hebei Province (No.A2020202002);the Natural Science Foundation of Chongqing (No.cstc2021jcyj-msxmX0241);the Key Project of Natural Science Foundation of Tianjin (No.S20ZDF077).

摘　　要：This work systematically studied the effect of volumetric energy density E on the densification,mi-crostructures,tensile mechanical properties,and shape memory performance of a Fe-Mn-Si-Cr-Ni shape memory alloy(SMA)fabricated by laser powder bed fusion(L-PBF).An E of 90-265 J/mm3 is suggested to fabricate the Fe-Mn-Si-Cr-Ni SMA with minor metallurgical defects and a high relative density of above 99%.The increase in E can promote the formation of the primaryγaustenite and the solid phase trans-formation from the primaryδferrite to theγaustenite,which helps to achieve a nearly complete y austenitic microstructure.The increase in E also contributes to fabricating the Fe-Mn-Si-Cr-Ni SMA with superior comprehensive mechanical properties and shape memory performance by L-PBF.The Fe-Mn-Si-Cr-Ni SMA with a combination of good ductility of around 30%,high yield strength of above 480 MPa,an ultrahigh ultimate tensile strength of above 1 GPa,and large recovery strain of about 6%was manu-factured by L-PBF under a high E of 222-250 J/mm^(3).The good shape memory effect,excellent compre-hensive mechanical properties,and low cost of Fe-Mn-Si-Cr-Ni SMAs,as well as the outstanding ability to fabricate complex structures of L-PBF technology,provide a solid foundation for the design and fabri-cation of novel intelligent structures.

关 键 词：Shape memory alloys Fe-Mn-Si-based alloys Laser powder bed fusion Mechanical property Microstructure 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG665[金属学及工艺—合金]