나노 준결정상으로 강화된 Ti계 벌크 비정질기지 복합재의 제조 및 기계적 특성 고찰 (Fabrication and mechanical properties of nanoquasicrystalline phase reinforced Ti-based bulk metallic glass matrix composites)

서지정보

· 발행기관 : 한국주조공학회
· 수록지 정보 : 한국주조공학회지 / 28권 / 6호 / 261 ~ 267페이지
· 저자명 : 박진만, 임가람, 김태응, 손성우, 김도향

초록

In-situ quasicrystalline icosahedral (I) phase reinforced Ti-based bulk metallic glass (BMG) matrix composites have been successfully fabricated by using two distinct thermal histories for BMG forming alloy. The BMG composite containing micron-scale I-phase has been introduced by controlling cooling rate during solidification, whereas nano-scale I-phase reinforced BMG composite has been produced by partial crystallization of BMG. For mechanical properties, micron-scale I-phase distributed BMG composite exhibited lower strength and plasticity compared to the monolithic BMG. On the other hand, nano-scale icosahedral phase embedded BMG composite showed enhanced strength and plasticity. These improved mechanical properties were attributed to the multiplication of shear bands and blocking of the shear band propagation in terms of isolation and homogeneous distribution of nano-size icosahdral phases in the glassy matrix, followed by stabilizing the mechanical and deformation instabilities.

영어초록

In-situ quasicrystalline icosahedral (I) phase reinforced Ti-based bulk metallic glass (BMG) matrix composites have been successfully fabricated by using two distinct thermal histories for BMG forming alloy. The BMG composite containing micron-scale I-phase has been introduced by controlling cooling rate during solidification, whereas nano-scale I-phase reinforced BMG composite has been produced by partial crystallization of BMG. For mechanical properties, micron-scale I-phase distributed BMG composite exhibited lower strength and plasticity compared to the monolithic BMG. On the other hand, nano-scale icosahedral phase embedded BMG composite showed enhanced strength and plasticity. These improved mechanical properties were attributed to the multiplication of shear bands and blocking of the shear band propagation in terms of isolation and homogeneous distribution of nano-size icosahdral phases in the glassy matrix, followed by stabilizing the mechanical and deformation instabilities.

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