Crystallization and compressive behaviors of Ti ₄₀Zr ₂₅Ni ₈Cu ₉Be ₁₈ BMG cast from different liquid states

The initial microstructure of Ti ₄₀Zr ₂₅Ni ₈Cu ₉Be ₁₈ metallic glass is sensitive to preparation condition. The Ti ₄₀Zr ₂₅Ni ₈Cu ₉Be ₁₈ metallic glasses, prepared at different liquid temperature by copper mold casting, would possess different first crystallization product because of difference in initial microstructure. During first crystallization, Crystallization product is mainly metastable icosahedral phase for metallic glass prepared at relative low liquid temperature. However, the mixture of α-Ti + icosahedral + unknown phase precipitates from metallic glass prepared at relative high liquid temperature. Moreover, the difference in initial microstructure also has a significant influence on compressive properties. Ti ₄₀Zr ₂₅Ni ₈Cu ₉Be ₁₈ metallic glasses prepared at relative low temperature exhibit better plasticity. One of important reasons is that dominant icosahedral short range order (SRO) increases shear viscosity of shear band, and the possibility of catastrophic failure caused by fast and continuous slide of shear band is depressed.