Chinese Journal of Lasers, Volume. 38, Issue 3, 303004(2011)
Microstructure and High Temperature Tensile Properties of Laser Direct Deposited Ti60 Alloy and TiCP/Ti60 Composites
Wall-like Ti60 alloy and TiCP(mass fraction 5%)/Ti60 titanium matrix composites are fabricated by laser direct deposition process. Their microstructure and tensile properties under 600 ℃ are investigated. The results indicate that the deposited Ti60 alloy presents a widmanstatten structure with some spherical rare earth phases distributing along the sub-grain boundaries and the α/β interface. For the deposited TiCP/Ti60 composites, there are some un-melted TiC particles and re-solidified TiC particles appear as discontinuous chain-like. The TiC particles distribute uniformly within the matrix with good interface bonding. Under 600 ℃, the ultimate tensile strength (UTS) of TiCP/Ti60 composites is 65 MPa higher than that of Ti60 alloy, following with decreased elongation. Ti60 alloy exhibit ductile fracture characteristics, while TiCP/Ti60 composite exhibit some complicated fracture characteristics including intergranular fracture, quasi-cleavage crack and local ductile rupture.
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Sun Jingchao, Zhang Yongzhong, Huang Can, Li Yan, Li Guowei. Microstructure and High Temperature Tensile Properties of Laser Direct Deposited Ti60 Alloy and TiCP/Ti60 Composites[J]. Chinese Journal of Lasers, 2011, 38(3): 303004
Category: laser manufacturing
Received: Aug. 26, 2010
Accepted: --
Published Online: Mar. 2, 2011
The Author Email: Jingchao Sun (sunjingchao5@gmail.com)