The Microalloying Effects in Cu-Based Bulk Metallic Glasses

Abstract:

The glassy alloy rods of Cu₅₀Zr₄₃Al₇, (Cu₅₀Zr₄₃Al₇)_100-xY_x(x=2,5) and (Cu₅₀Zr₄₃Al₇)_100-xAg_x(x=6,7) with diameters of 3.0 mm were prepared by copper mold suction casting method. The influence of adding Ag and Y to Cu₅₀Zr₄₃Al₇ metallic glass on glass formation ability (GFA) and thermal stability was studied by means of X-ray diffraction analysis (XRD) and differential scanning calorimetry (DSC). The results show that Ag and Y appropriate micro-addition enhance the glass formation ability and thermal stability of the Cu-Zr-Al metallic glass. The effect of Ag is better than that of Y. The addition of Ag causes a increase of the reduced glass transition temperature (T_rg) of (Cu₅₀Zr₄₃Al₇)_100-xAg_x alloy from 0.618 at 0 at.% Ag to 0.628 at 7 at.% Ag. The width of the supercooled liquid region of Cu₄₃Zr₄₃Al₇Ag₇ glassy alloy increases about 25K compared with that of Cu₅₀Zr₄₃Al₇, and the γ value of Cu₄₃Zr₄₃Al₇Ag₇ reaches 0.433. The electrochemical corrosion behaviors of Cu₅₀Zr₄₃Al₇, (Cu₅₀Zr₄₃Al₇)_100-xY_x(x=2,5) and (Cu₅₀Zr₄₃Al₇)_100-xAg_x(x=6,7) metallic glasses in 3.5% NaCl solution were investigated by potentiodynamic polarization method. It is found that corrosion resistance of all amorphous alloys is better than that of the corresponding crystalline alloys. The Ag and Y micro-addition improve corrosion resistance of Cu₅₀Zr₄₃Al₇ metallic glass. The corrosion current density of Cu₄₃Zr₄₃Al₇Ag₇ metallic glass decreases 1~2 orders of magnitude compared with that of Cu₅₀Zr₄₃Al₇.

• Periodical: Materials Science Forum (Volume 688)
• Pages: 407-412
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.688.407
• Online since: June 2011
• Authors: Li Jie Yue, Jin Sheng Han, Kun Xie
• Keywords: Corrosion Resistance, Cu-Based Bulk Metallic Glass, Glass Forming Ability (GFA), Polarization Curve, Thermal Stability

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