射出成形法によるTiAl焼結体の高温引張特性 Tensile Properties at High Temperature of Sintered TiAl Compacts by Injection Molding
In this paper, tensile properties at high temperature were investigated on the sintered TiAI compacts produced by MIM process. The sintered Ti-45A1, Ti-48AI, Ti-50A1 and Ti-52A1(at.%) compacts showed the relative densities more than 95% by sintering at 13751 for.2hr in vacuum(10<SUP>-2</SUP>Pa order).<BR>The results obtained were summarized as follows:<BR>(1) The tensile strengths at 800°C for Ti-45A1, Ti-48AI and Ti-50Al compacts were almost equal to the strength at room temperature, which were in the range of 370 to 400MPa. The Ti-52Al compact showed smaller tensile strength at 800°C(330MPa) than the strength at room temperature(430MPa). The elongations at 800°C for TiAl compacts increased with increasing Al content. Especially, the Ti-52A1 compact showed the highest elongation of 13%.<BR>(2) The tensile strengths at 1000°C for all TiAI compacts were smaller(-200MPa) than the strength at 800°C, which were sligthly increased with decreasing Al content. The elongations at 1000°C were still more than 10%.
粉体および粉末冶金 44(11), 1029-1034, 1997-11-15
Japan Society of Powder and Powder Metallurgy