Microstructure Characteristics and Mechanical Properties of Nb-17Si-23Ti Ternary Alloys Fabricated by In Situ Reaction Laser Melting Deposition

作     者：Wei Liu Hua-Ping Xiong Neng Li Shao-Qing Guo Ren-Yao Qin 

作者机构：3D Printing Research and Engineering Technology CenterBeijing Institute of Aeronautical MaterialsBeijing 100095China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2018年第31卷第4期

页      面：362-370页

核心收录：

学科分类：0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 0811[工学-控制科学与工程] 

基　　金：the support by the National Natural Science Foundation of China(Grant No.51605456) 

主　　题：Nb-Si-Ti alloys Laser melting deposition Microstructure Mechanical properties In situreaction 

摘      要：Fabrication of ternary Nb-17Si-23Ti alloys was attempted by in situ reaction laser melting deposition（LMD）with dual powder feeding method from Nb-28 at.% Ti powder mixture and pure Si *** microstructures of the as-deposited alloys were examined with scanning electronic microscope,and the phase constituents were analyzed by X-ray energy-dispersive spectrometer and X-ray ***,the effect of laser power on microstructure charac-teristics,microhardness and indentation fracture toughness was also *** in situ reaction LMD process resulted in remarkable refinement of the *** as-deposited samples mainly consisted of Nbss,metastable（NbTi）3Si and Ti-rich *** the increase in the laser power from 1000 to 2000 W,the Nbss morphology changed from discontinuous dendritic to near equiaxed,but the Ti-rich Nbss phase tended to ***,with the increase in the laser power,the microhardness of as-deposited samples increased from 822 to 951 HV,while the indentation fracture toughness was improved from 12.3 to 14.1 MPa mt/*** corresponding mechanism is also discussed.