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논문 기본 정보

자료유형
학술저널
저자정보
Kim, Hee-Y. (Dept. of Materials Science and Engineering, Korea Advanced Institute of Science and Technology) Hong, Soon-H. (Dept. of Materials Science and Engineering, Korea Advanced Institute of Science and Technology) Chun, Chang-H. (Agency for Defense Development P.O. Box 3)
저널정보
한국재료학회 Fabrication and Characterization of Advanced Materials Fabrication and Characterization of Advanced Materials 제1권 제2호
발행연도
1995.1
수록면
321 - 326 (6page)

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The high temperature deformation behavior and microstructure evolution of Ti-47Al-2Cr-4Nb intermetallic compound during isothermal compression tests have been investigated at temperature ranged $1000-1200^{\circ}C$ with strain rate ranged $10^{-3}-10^{-1}/s$. Ti-47Al-2Cr-4Nb intermetallic compound was prepared by arc-melting and followed by homogenization at $1200^{\circ}C$ for 24hours. The as-cast microstructure of Ti-47Al-2Cr-4Nb consisted with ${\alpha}/{\gamma}$ lamellar structure and was transformed into equiaxed grains with small amoung of Cr-rich ${\beta}_2$ phase at grain boundaries after homogenization. The stress-strain curves showed the flow softening which is attributed to dynamic recrystallization. The flow stress increased with decreasing temperature and with increasing strain rate. The dependence of flow stress on temperature and strain rate was formulated using the Zener-Hollomon parameter. The activation energy was measured as 300kj/mol and the stress exponent was measured as 4.86. The dynamic recrystallization was observed during high temperature deformation of Ti-47Al-2Cr-4Nb intermetallic compound. The recrystallized grain size decreased with decreasing temperature and with increasing strain rate. The dependence of the recrystallized grain size on Zener-Hollomon parameter was formulated.

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