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산소함량에 따른 Ti-Al-Fe-Si-O 합금의 기계적 특성 및 미세조직 변화
배진주 ( Jin Joo Bae ),염종택 ( Jong Taek Yeom ),박찬희 ( Chan Hee Park ),홍재근 ( Jae Keun Hong ),김성웅 ( Senog Woong Kim ),윤석영 ( Seog Young Yoon ),이상원 ( Sang Won Lee ) 한국열처리공학회 2016 熱處理工學會誌 Vol.29 No.6
The effect of the oxygen content and the annealing temperature on the tensile behavior of the Ti- 1.5Al-3Fe-0.25Si-(0.1~0.5)O alloy was investigated. The tensile properties were dependent on the volume fraction of the microstructure constituents, i.e. the equixed α, equixed β and lamellar α. The results showed that the O-partitioned equixed α had a much higher strength compared to the equixed β. The strength of the lamellar α increased with increasing the annealing temperature because the O content of the lamellar α increased. Ti-1.5Al- 3Fe-0.25Si-0.3O alloy annealed to 900℃ where the volume fraction of lamellar α was the highest exhibited an excellent combination of the strength (1198.5 MPa) and ductility (27.5%). The effect of the lamellar α on the ductility was discussed. (Received September 7, 2016; Revised September 19, 2016; Accepted October 4, 2016)