Effect of Co Addition on the Glass-Forming Ability and Mechanical Properties of Ti-Zr-Be-Cu-Co Bulk Amorphous Alloys

Zhong Yuan Suo; Yan Ling Song; Ke Qiang Qiu

doi:10.4028/www.scientific.net/AMM.182-183.203

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 182-183Effect of Co Addition on the Glass-Forming Ability...

Effect of Co Addition on the Glass-Forming Ability and Mechanical Properties of Ti-Zr-Be-Cu-Co Bulk Amorphous Alloys

Abstract:

The effect of Co substitution for Be on the glass-forming ability and mechanical properties was investigated in Ti₃₅Zr₃₀Be_27.5-xCu_7.5Co_x (x=0, 3.5, 7.5, 11.5 at.%) alloys by using X-ray diffractometry (XRD), differential scanning calorimetry (DSC), high-resolution transmission electron microscopy (HRTEM) and compression test. With the substitution of Co for Be, glass-forming ability (GFA) is significantly enhanced and fully amorphous rods with a diameter of up to 12 mm were produced in the alloy with 3.5 and 7.5 at.% Co. The Ti₃₅Zr₃₀Be₂₄Cu_7.5Co_3.5 bulk glassy alloy exhibits good plasticity of 4% during compressive applied load at ambient temperature in conjunction with distinct yield strain of 2% and high fracture strength of 2196 MPa. The effect of the addition of Co on the structure and deformation behavior of the Ti₃₅Zr₃₀Be_27.5-xCu_7.5Co_x (x=0, 3.5, 7.5, 11.5 at.%) alloys is discussed.