| 신다운1 · 민 홍2 · 이진규1,* |
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| 방전플라즈마 소결법에 의해 제조된 Cu-Ni-Zr-Ti 비정질 기지
복합재료의 미세조직 및 기계적 특성 |
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Received: 24 February 2021; Accepted: 25 February 2021. Published online: 6 April 2021. |
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| ABSTRACT |
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In the present study, Cu54Ni6Zr22Ti18 bulk metallic glass composites were developed by spark
plasma sintering(SPS) using gas atomized Cu54Ni6Zr22Ti18 metallic glass powders and Ta powders. Metallic
glass composites with Ta phase were fabricated by SPS. The successful consolidation of Cu54Ni6Zr22Ti18
metallic glass matrix composites with the Ta phase was achieved through the strong bonding due to the plastic
deformation of the Ta powder and the super-plastic behavior of the metallic glass powder in the supercooled
liquid state during SPS. The deformed Ta phases were well distributed in the Cu54Ni6Zr22Ti18 metallic glass
matrix. The compressive fracture strength and total strain were 1770 Mpa and 10.2%, respectively, for the
Cu54Ni6Zr22Ti18 bulk metallic glass composite with 40 wt% Ta phases. The uniformly dispersed deformed Ta
phase in the Cu54Ni6Zr22Ti18 metallic glass matrix effectively impedes the propagation of the first shear band
and generates a second shear band, causing a crossing of the shear bands, resulting in an improvement in
plastic strain. This increase in plastic deformation is related to the fact that the deformed Ta phase, uniformly
distributed in the Cu54Ni6Zr22Ti18 metallic glass matrix, acts as a source of shear bands and at the same time
effectively suppresses the movement of the shear bands, dispersing the stress and causing wide plastic
deformation. |
| Keywords:
powder, spark plasma sintering, bulk metallic glass, composite, shear band |
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