Effect of Ag Addition on the Improvement of Glass-forming Ability and Plasticity of Mg–Cu–Gd Bulk Metallic Glass

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<jats:p>The effect of Ag substitution for Cu on the glass forming ability (GFA) and mechanical properties of Mg<jats:sub>65</jats:sub>Cu<jats:sub>25−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Ag<jats:italic><jats:sub>x</jats:sub></jats:italic>Gd<jats:sub>10</jats:sub> (<jats:italic>x</jats:italic> = 0, 5, 10, 15, 20, 25) alloyswere investigated using x-ray diffractometry and differential scanning calorimetry.The partial substitution of Cu by Ag in Mg<jats:sub>65</jats:sub>Cu<jats:sub>25</jats:sub>Gd<jats:sub>10</jats:sub> promoted the GFA. Mg<jats:sub>65</jats:sub>Cu<jats:sub>20</jats:sub>Ag<jats:sub>5</jats:sub>Gd<jats:sub>10</jats:sub> bulk metallic glass (BMG) with a diameter of 11 mm could be fabricated by conventional copper-mold casting method in air atmosphere. The Mg<jats:sub>65</jats:sub>Cu<jats:sub>20</jats:sub>Ag<jats:sub>5</jats:sub>Gd<jats:sub>10</jats:sub> BMG exhibits yielding and plastic deformation during compressive loading. The compressive fracture strength, total strain to failure, and plastic strain to failure of the Mg<jats:sub>65</jats:sub>Cu<jats:sub>20</jats:sub>Ag<jats:sub>5</jats:sub>Gd<jats:sub>10</jats:sub> BMG were 909 MPa, 2.21% and 0.5%, respectively.</jats:p>

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