Effect of addition of Zn and Al elements on glass-forming ability and thermal stability of Mg-Cu-Y bulk metallic glasses

摘要

After substituting partial Cu and Mg with Zn or Al elements for Mg65Cu25Y10 alloy,respectively,the metallic glass plate samples with thickness of 23 mm were prepared by water-quenching,their respective glass-forming ability and thermal stability were studied by using differential thermal analysis (DTA) and X-ray diffraction (XRD).Using Kissinger equation,the activation energies of crystallization of these metallic glasses heated with a constant rate were calculated.The results show that Al element is greatly harmful to the glass-forming ability of Mg-Cu-Y alloys and cannot acquire bulk amorphous alloys; nevertheless,the effect of Zn element addition is indeterminate for various components.The magnitudes of thermal stability are also revealed.