Fabrication of ternary Mg–Cu–Gd bulk metallic glass with high glass-forming ability under air atmosphere

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<jats:p>A new Mg<jats:sub>65</jats:sub>Cu<jats:sub>25</jats:sub>Gd<jats:sub>10</jats:sub> alloy having significantly improved glass-forming ability (GFA) has been developed. In this article, we show that the ternary Mg<jats:sub>65</jats:sub>Cu<jats:sub>25</jats:sub>Gd<jats:sub>10</jats:sub> bulk metallic glass with diameter of at least 8 mm can successfully be fabricated by a conventional Cu-mold casting method in air atmosphere. The critical cooling rate for glass formation was estimated on the order of magnitude of approximately 1 K/s. When compared with the GFA of Mg<jats:sub>65</jats:sub>Cu<jats:sub>25</jats:sub>Y<jats:sub>10</jats:sub> alloy, the significantly improved GFA of Mg<jats:sub>65</jats:sub>Cu<jats:sub>25</jats:sub>Gd<jats:sub>10</jats:sub> alloy cannot be explained by Δ<jats:italic>T</jats:italic><jats:sub>x</jats:sub> and <jats:italic>T</jats:italic><jats:sub>rg</jats:sub> values.</jats:p>

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