Abstract

An (Mg0.585Cu0.305Y0.11)95Be5 bulk metallic glass (BMG) with high strength was fabricated by conventional Cu-mold casting method. The phase structure, thermal stability and microstructure of the BMG were investigated by using X-ray diffraction, differential scanning calorimetry, transmission electron microscopy and scanning electron microscopy. The results show that the quaternary (Mg0.585Cu0.305Y0.11)95Be5 BMG with 3mm in diameter exhibits obvious glass transition Tg of 429K and a wide supercooled liquid region ΔTx of 53K. Meanwhile, the phase-separated regions characteristic of Cu–Y–Be glass containing nanometer CuY crystals are heterogeneously distributed in the Mg–Cu–Y glassy matrix in the as-cast samples. Under uniaxial compressive loading, the samples with 1, 2 and 3mm in diameter show high strength up to 959, 955MPa and 954MPa, respectively. The sample-size independence of fracture strength was for the first time found in the Mg-TM–RE metallic glasses. The effects of Be addition on phase separation and mechanical properties for Mg–Cu–Y alloy system were discussed.

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