논문 해외 국제전문학술지(SCI급) Mechanical behaviors of partially devitrified ti-based bulk metallic glass
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2005-09
- 저자명 J. M. PARK, J. S. PARK∗, J.-H. KIM, H. J. CHANG
- 학술지명 JOURNAL OF MATERIALS SCIENCE
- 발행처명 SPRINGER LINK
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 4
홈페이지첨부 파일
논문 초록 (Abstract)
The fabrication of bulk metallic glasses (BMGs) has received attention due to their unique properties and potential applicability [1–3]. The beneficial characteristics of composite systems that allow controlling mechanical properties of BMGs has led to the fabrication of in-situ composite systems or partially devitrified BMGs and thus to the prevention of catastrophic fracture of BMGs [4, 5]. The composite has shown improved mechanical properties compared with monolithic BMGs. It has been proposed that the enhanced strength and ductility of the composite is due to the high strength of devitrified nano-sized particles, stable interfaces, or enhanced multiple shear band formation, inferring that the devitrification process and selection of nanoparticles significantly affects the mechanical properties of the composite [6, 7]. Also, when enhanced mechanical properties of the composites are observed, a specific amount of volume fraction of nanoparticle embedded in amorphous matrix has been reported [6, 7]. In order to control the volume fractions of nanocrystals in amorphous matrix, a devitrification process of BMG via controlled thermal process has been exercised in several BMG systems. While the mechanical properties of the composites sensitively react to the volume fraction of nanocrystalline phase, the effect of mechanical properties upon heat treatment temperatures (and heating rate) has rarely focused in the previous studies. In this study, we have carefully selected a BMG with a composition of Ti55Zr18Ni6Cu7Be14 (at.%) that shows α-Ti as a primary phase after partial devitrification process. Following investigation of continuous differential scanning calorimetry (DSC) trace with different heating rates and crystallization onset temperatures of the BMG, we were able to obtain an optimized α-Ti (hexagonal close packed structure) volume fraction. Also, the mechanical behaviors of various α-Ti volume fraction at various heat treatment temperatures have been investigated in order to provide a guideline for optimized crystallization volume fractions and the temperature effects.