Research on Cu-Based Bulk Glassy Alloys and its Mechanical Properties

Abstract:

High-strength Cu-based bulk glassy alloys with a large supercooled liquid region in Cu-Zr-Ti-Ni systems were prepared by means of copper mold casting. The Cu-based bulk glassy alloys samples were tested by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and Instron testing machine. The result indicates, the maximum diameter was 5.0 mm for the Cu₅₅Zr₂₅Ti₁₅Ni₅ bulk glassy alloy. The temperature interval of supercooled liquid region (ΔT_x) is as large as 45.48-70.98 K for the Cu-Zr-Ti-Ni alloy. The Cu-based glassy alloys rods exhibited the very high mechanical properties and the distinct plastic strains. The compressive fracture strength is 2155 MPa, 2026 MPa and 1904 MPa respectively for Cu₅₀Zr₂₅Ti₁₅Ni₁₀, Cu₅₅Zr₂₅Ti₁₅Ni₅ and Cu₅₄Zr₂₂Ti₁₈Ni₆ bulk glassy alloys. The Vickers hardness is respectively 674, 678 and 685 for the Cu₅₀Zr₂₅Ti₁₅Ni₁₀, Cu₅₅Zr₂₅Ti₁₅Ni₅ and Cu₅₄Zr₂₂Ti₁₈Ni₆ bulk glassy alloys. The addition Co element to Cu-Zr-Ti-Ni alloy expand the ΔT_x, the ΔT_x is 74.5 K for Cu₅₀Zr₂₂Ti₁₈Ni₆Co₄ bulk glassy alloys.

• Periodical: Applied Mechanics and Materials (Volume 329)
• Pages: 127-132
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.329.127
• Online since: June 2013
• Authors: Peng Jun Cao, Ji Ling Dong, Hai Dong Wu
• Keywords: Copper-Based Bulk Glassy Alloys, Glass-Forming Ability, Mechanical Property, Supercooled Liquid Region, Thermal Stability

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