WU Donghai;HU Gengxiang (Department of Materials Science; Shanghai Jiaotong University; Shanghai 200030)INUI Haruyuki; YAMAGUCHI Masaharu (Kyoto University; Kyoto 606-01; Japan). DEFORMATION BEHAVIOR OF γ-TiAl SINGLE CRYSTALS AT DIFFERENT TEMPERATURES. Acta Metall Sin, 1998, 34(1): 39-44.
Abstract The plastic deformation behavior of γ-TiAl(Ti-56%Al) single crystals was studied by compression in the temperature range of-196-1100℃ along seven crystal orientations: [001],[152] , [021], [233], [191], [251] and [110]. The profile of the yield stress-temperature curves measured can be divided into three parts: in the temperature range of-196-600℃, the yield stress first decreases rapidly with increasing temperature followed by a plateau above room-temperature.The yield stress then shows an anomalous increase with increasing temperature above 600 ℃and reaches a peak between 700-1000℃, depending on crystal orientations. Above the peak temperature, the yield stress again decreases rapidly with increasing temperature. Below the peak temperature, the deformation mode is {111}<110] ordinary slip only for [021] orientation and {111}<101] superlattice slip for other orientations. Above the peak temperature, the deformation modes are: {111}<112] twinning, {111}<112] superlattice slip or ordinary slip. The planes for ordinary slip can be {111}, {110) or (001), depending on crystal orientations.
WU Doughai; HU Gengxiang(Department of Materials Science; Shanghai Jiaotong University; Shanghai 200030INUI Haruyuki; YAMAGUCHI Masaharu)(Kyoto University; Faculty of Engineering; Kyoto 606--01; JapanCorrespondent : HU Gengxiang; professor Tel: (O21)62812558; Fax. (021)62820892). THE BEHMAVIORS OF (1/2)〈110] DISLOCATIONS IN γ-TiAl SINGLE CRYSTALS[J]. 金属学报, 1998, 34(6): 561-564.
