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High Temperature Deformation Behavior of Ti-Al Intermetallic Compound and Orientation Distribution of Lamellae Structure  

Park Kyu-Seop (요코하마국립대학 공학부 생산공학과)
Kang Chang-Yong (국립부경대학 재료공학부)
Lee Keun-Jin (양산대학 전자통신과)
Chung Han-Shik (국립경상대학 수송기계공학부)
Jung Young-Guan (국립금오공과대학교 기계공학부)
Fukutomi Hiroshi (요코하마국립대학 공학부 생산공학과)
Publication Information
Journal of the Korean Society for Precision Engineering / v.21, no.10, 2004 , pp. 162-169 More about this Journal
Abstract
High temperature uniaxial compression tests in the alpha single phase region were carried out on the Ti -43mo1%Al intermetallic compound, in order to obtain oriented lamellar microstructure. The compression deformation temperatures and strain rates are from 1573k to 1623k and 1.0x10$^{-4}$ s to 5.0x10$^{-3}$ s, respectively. Fully lamellar microstructure was observed after the uniaxial compression deformation in a single phase region followed by cooling to room temperature. Lamellar colony diameter depended on strain rates and test temperatures. The diameter varied between 8601m and 300fm. Stress-strain curve showed a work softening and the size of lamellar colony diameter varied depending on peak stresses. This shows the occurrence of dynamic recrystallization. Texture measurements after the uniaxial compression deformation, showed the development of fiber during dynamic recrystallization. It is seen that the area for the maximum pole density existed in 35 degrees away from the compression plane. The texture sharpens with a decrease in strain rate
Keywords
TiAl alloy; Fully lamellar microstructure; Fiber texture; Dynamic recrystallization; Orientation; Distribution;
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