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KMID : 0381920150450020037
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Korean Journal of Microscopy
2015 Volume.45 No. 2 p.37 ~ p.43
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Phase Transformation and Work-hardening Behavior of Ti-based Bulk Metallic Glass Composite
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Hong Sung-Hwan
Kim Jeong-Tae
Park Hae-Jin
Kim Young-Seok
Park Jin-Man
Suh Jin-Yoo
Na Young-Sang
Lim Ka-Ram
Kim Ki-Buem
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Abstract
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In present work, work-hardening behavior of TiCu-based bulk metallic glass composite with B2 particles has been studied by systemic structural and mechanical investigations. After yield, pronounced work-hardening of the alloy was clearly exhibited, which was mainly related to the martensitic transformation as well as the deformation twinning in B2 particles during deformation. At the early plastic deformation stage (work-hardening stage), the stress-induced martensitic transformation from B2 phase to B19' phase and deformation-induced twinning of B19' phase was preferentially occurred in the around interface areas between B2 phase and amorphous matrix by stress concentration. The higher hardness value was observed in vicinity of interface within the B2 particles which are probably connected with martensitic transformation and deformation twinning. This reveals that the work-hardening phenomenon of this bulk metallic glass composite is a result of the hardening of B2 particles embedded in amorphous matrix.
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KEYWORD
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Bulk metallic glass composite, Work-hardening, Martensitic transformation, Deformation twinning
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