Microstructure and mechanical property of laser melting deposition (LMD) Ti/TiAl structural gradient material
作者： H.P. Qu , P. Li , S.Q. Zhang , A. Li , H.M. Wang
DOI: 10.1016/J.MATDES.2009.07.004
关键词:
摘要: Abstract This article presents fabrication, microstructure and mechanical properties study of Ti/TiAl functional gradient material. Ti–47Al–2.5V–Cr/Ti–6Al–2Zr–Mo–V material was successfully fabricated by the laser melting deposition (LMD) manufacturing process. Microstructure chemical composition characterized OM, SEM, TEM EPMA. The Vickers hardness room-temperature tensile property evaluated on longitudinal direction. Results showed that fully lamellar (FL) consisted γ -TiAl α 2 -Ti 3 Al formed Ti–47Al–2.5V–Cr side, while coarse basket weave Ti–6Al–2Zr–1Mo–1V side. No cracking found in zone after aging at 800 °C for 48 h. strength as-deposited specimen is up to approximately 1198.8 MPa direction, elongation 0.4%, indicating a typical brittle fracture.
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