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

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 powder. The microstructures of the as-deposited alloys were examined with scanning electronic microscope, and the...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2018-04, Vol.31 (4), p.362-370
Main Authors: Liu, Wei, Xiong, Hua-Ping, Li, Neng, Guo, Shao-Qing, Qin, Ren-Yao
Format: Article
Language:English
Subjects:
Additive manufacturing
Alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Crack propagation
Deposition
Fracture toughness
Indentation
Laser beam melting
Lasers
Materials Science
Mechanical properties
Metallic Materials
Microhardness
Microstructure
Morphology
Nanotechnology
Organometallic Chemistry
Oxidation
Powder metallurgy
Spectroscopy/Spectrometry
Temperature
Ternary alloys
Tribology
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Summary: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 powder. The 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 diffraction. Furthermore, the effect of laser power on microstructure characteristics, microhardness and indentation fracture toughness was also investigated. The in situ reaction LMD process resulted in remarkable refinement of the microstructure. The as-deposited samples mainly consisted of Nb SS , metastable (NbTi) 3 Si and Ti-rich Nb SS . With the increase in the laser power from 1000 to 2000 W, the Nb SS morphology changed from discontinuous dendritic to near equiaxed, but the Ti-rich Nb SS phase tended to vanish. Furthermore, 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 m 1/2 . The corresponding mechanism is also discussed.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-017-0619-y