Development of New Cu-Zr-Al-Pd Bulk Metallic Glasses with excellent mechanical and corrosion properties

Acta Metall Sin

2007, Vol. 43

Issue (2): 177-181 DOI:

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Development of New Cu-Zr-Al-Pd Bulk Metallic Glasses with excellent mechanical and corrosion properties

华中科技大学材料学院

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. Development of New Cu-Zr-Al-Pd Bulk Metallic Glasses with excellent mechanical and corrosion properties. Acta Metall Sin, 2007, 43(2): 177-181 .

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Abstract Cu43Zr43Al7Pd7 bulk metallic glass (BMG) with a diameter up to 5mm was successfully prepared by copper mold casting. The glass-forming ability (GFA) and thermal stability of the BMG obtained were investigated by means of XRD, DSC and DTA. It is shown that Cu43Zr43Al7Pd7 system exhibited an excellent glass forming ability as indicated by high values of Trg (=0.607) and γ (=0.417) as well as supercooled liquid region(Tx= 75K), respectively. Uniaxial compressive test revealed that the BMG obtained possesses pretty good mechanical properties with a fracture strength of 1877 MPa and an overall strain of 4.9%, respectively. Electrochemical measurements were carried out in 1mol/LH2SO4 and 3%NaCl aqueous solutions by potentiadynamic polarization at room temperature. It is shown that Cu43Zr43Al7Pd7 BMG exhibited spontaneous passivation in both solutions with wide passive regions. The passive current densities are about 10-6～10-5 A/cm2, which are much lower than that of Cr18-Ni8 stainless steel, implying a good corrosion resistance.

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Received: 23 May 2006

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TG139.8

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