Effects of carbon addition on the microstructure and mechanical property of in-situ reinforced TiAl matrix composite powders produced by plasma rotating electrode process

• DOI: 10.1016/j.jmrt.2023.10.318
• Publication Date: 2023-11-05T00:21:40Z
• Authors: Weigang Yang; Mingao Li; Su Su; Shulong Xiao; Yuyong Chen
• Keywords: Carbon fibers; Equiaxed crystals; Particle (ecology)

To investigate effects of carbon addition on microstructural characteristics rapidly solidified TiAl alloys, Ti–43Al–6Nb-xC (x = 0,0.5,1.0 at.%) powders are produced by plasma rotating electrode process (PREP). Due to the greater viscosity composite melts with carbides than those without carbides, average sizes containing much larger theoretical diameters. In addition, phase compositions carbon-free usually consist α and β phase, while is predominant in due α-phase stabilizer. β→α transformation during rapid solidification Burgers relationships {110}β||(0001)α <111>β||(11–20)α illustrated powders. Three types microscopic structures unfolded powders: smooth structures, dendrite equiaxed which stem from various cooling rates. With contents rising 1.0 at.%, grain size particle range 100∼150 μm refined 24.31 ± 0.38 11.32 0.36 μm, moreover, distribution ranges vary dramatically. Additionally, micro-hardness gradually upgrades as ascend. The maximum at.% touches at 758.7 15.4HV. Solid solution strengthening, refinement strengthening second-phase main sources for ascent micro-hardness.