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저융점 원소의 첨가에 따른 Ti65Fe35 과공정 합금의 미세구조와 기계적 특성의 변화 KCI 등재 SCOPUS

Evolution on Microstructure and Mechanical Property of Ti65Fe35 Hypereutectic Alloys by Adding Low Melting Temperature Elements

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한국재료학회지 (Korean Journal of Materials Research)
한국재료학회 (Materials Research Society Of Korea)
초록

The microstructural evolution and modulation of mechanical properties were investigated for a Ti65Fe35 hypereutectic alloy by addition of Bi53In47 eutectic alloys. The microstructure of these alloys changed with the additional Bi- In 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 β-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 (β-Ti/TiFe + β- 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 β-Ti phase are crucial factors for controlling the mechanical properties of the ultrafine dendrite-eutectic composites.

저자
  • 황윤중(세종대학교 나노신소재공학과)
  • 홍성환(세종대학교 나노신소재공학과)
  • 김정태(세종대학교 나노신소재공학과)
  • 김영석(세종대학교 나노신소재공학과)
  • 박혜진(세종대학교 나노신소재공학과)
  • 김희진(세종대학교 나노신소재공학과)
  • 정연범(세종대학교 나노신소재공학과)
  • 이영훈(세종대학교 나노신소재공학과)
  • 김기범(세종대학교 나노신소재공학과) Corresponding author