Plastic Deformation Behavior of Al 5 Ti 3 Single-Phase Single Crystals
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Plastic Deformation Behavior of Al5Ti3 Single-Phase Single Crystals Takayoshi Nakano*), Koutaro Hayashi, Yosuke Nagasawa and Yukichi Umakoshi Department of Materials Science and Engineering & Handai Frontier Research Center, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, JAPAN *) E-mail: [email protected] ABSTRACT Al5Ti3 single-phase single crystals with the stoichiometric composition of Ti-62.5at.%Al were obtained by the floating zone method and subsequent heat treatment at 750˚C for 48h. The crystals contain no L10 phase, but compose of anti-phase domains (APD) surrounded by the anti-phase boundary (APB) on the basis of the Al5Ti3 long-period superstructure. Orientation dependence of plastic deformation behavior and operative slip system were examined in compression in a wide temperature range between RT and 750˚C using the single-phase single crystals in comparison with Al-rich TiAl single crystals with the L10 matrix and Al5Ti3 precipitates. In the wide crystal orientation area, {111)
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