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저융점 원소의 첨가에 따른 Ti<sub>65</sub>Fe<sub>35</sub> 과공정 합금의 미세구조와 기계적 특성의 변화
황윤중,홍성환,김정태,김영석,박혜진,김희진,정연범,이영훈,김기범,Hwang, Yun Jung,Hong, Sung Hwan,Kim, Jeong Tae,Kim, Young Seok,Park, Hae Jin,Kim, Hee Jin,Jeong, Yeon Beom,Lee, Young Hoon,Kim, Ki Buem 한국재료학회 2017 한국재료학회지 Vol.27 No.10
The microstructural evolution and modulation of mechanical properties were investigated for a $Ti_{65}Fe_{35}$ hypereutectic alloy by addition of $Bi_{53}In_{47}$ eutectic alloys. The microstructure of these alloys changed with the additional BiIn elements from a typical dendrite-eutectic composite to a bimodal eutectic structure with primary dendrite phases. In particular, the primary dendrite phase changed from a TiFe intermetallic compound into a ${\beta}$-Ti solid solution despite their higher Fe content. Compressive tests at room temperature demonstrated that the yield strength slightly decreased but the plasticity evidently increased with an increasing Bi-In content, which led to the formation of a bimodal eutectic structure (${\beta}$-Ti/TiFe + ${\beta}$-Ti/BiIn containing phase). Furthermore, the (Ti65Fe35)95(Bi53In47)5 alloy exhibited optimized mechanical properties with high strength (1319MPa) and reasonable plasticity (14.2 %). The results of this study indicate that the transition of the eutectic structure, the type of primary phases and the supersaturation in the ${\beta}$-Ti phase are crucial factors for controlling the mechanical properties of the ultrafine dendrite-eutectic composites.