HIGH TEMPERATURE DEFORMATION BEHAVIOUR OF TiAl INTERMETALLIC COMPOUND
HAO Shiming;ZHENG Zhanqing Northeast University of Technology; Shenyang professor; Department of Materials Science and Engineering;Northeast University of Technology;Shenyang 110006
Cite this article:
HAO Shiming;ZHENG Zhanqing Northeast University of Technology; Shenyang professor; Department of Materials Science and Engineering;Northeast University of Technology;Shenyang 110006. HIGH TEMPERATURE DEFORMATION BEHAVIOUR OF TiAl INTERMETALLIC COMPOUND. Acta Metall Sin, 1990, 26(3): 131-135.
Abstract The behaviour of TiAl intermetallic compound of Ll_0 type under com-pressive deformation at high temperature and its recrystallization microstructurehave been studied. The compressive proof stress of the polycrystalline TiAl wasfound to be a positive temperature dependence as same as the single crystal one.The correlation of the flow stress together with strain rate and deformation tem-perature is in good agreement with the expression: ε=Aσ_p~nexp(-Q/RT)Adjusting the deformation temperature and strain rate to a decrease in flow stressof alloy down to below its brittle fracture stress may improve successfully notonly the hot working of the TiAl-base alloy but also the fineness of the recry-stalline grains.
1 Lipssit H A, Shechtman D, Schafrik R E. Metall Trans, 1975; 6A: 1991 2 Blackburn W J, Smith M P. US Pat 4292077, 1981 3 Zener C, Hollomon J. J Appl Phys, 1944; 39: 163 4 山口正治,马越佑吉.金属间化合物,日刊工业新闻社,1984:4