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자료유형
학술저널
저자정보
Hyo Jin Park (Sejong University) Sung Hwan Hong (Sejong University) Hae Jin Park (Sejong University) Young Seok Kim (Sejong University) 김정태 (Austrian Academy of Sciences) Young Sang Na (Korea Institute of Materials Science) Ka Ram Lim (Korea Institute of Materials Science) Wei‑Min Wang (Shandong University) Ki Buem Kim (Sejong University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.2
발행연도
2018.1
수록면
241 - 247 (7page)

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In the present study, the influence of atomic ratio of Zr to Ti on the microstructure and mechanical properties of Ni–Cu–Zr–Ti–Si–Sn alloys is investigated. The alloys were designed by fine replacement of Ti for Zr from Ni39Cu20Zr36−xTixSi2Sn3. Theincrease of Ti content enhances glass forming ability of the alloy by suppression of formation of (Ni, Cu)10(Zr, Ti)7 phaseduring solidification. With further increasing Ti content up to 24 at.%, the B2 phase is introduced in the amorphous matrixwith a small amount of B19′ phase from alloy melt. The bulk metallic glass composite containing B2 phase with a volumefraction of ~ 10 vol% exhibits higher fracture strength (~ 2.5 GPa) than that of monolithic bulk metallic glass (~ 2.3 GPa). This improvement is associated to the individual mechanical characteristics of the B2 phase and amorphous matrix. The B2phase exhibits higher hardness and modulus than those of amorphous matrix as well as effective stress accommodation upto the higher stress level than the yield strength of amorphous matrix. The large stress accommodation capacity of the hardB2 phase plays an important factor to improve the mechanical properties of in situ Ni-based bulk metallic glass composites.

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