Materials Transactions Online

Materials Transactions, Vol.51 No.04 (2010) pp.826-829
© 2010 The Japan Institute of Metals

Synthesis and Mechanical Properties of New Cu-Based Cu-Zr-Al Glassy Alloys with Critical Diameters up to Centimeter Order

B. W. Zhou1,2, X. G. Zhang3, W. Zhang3,4, H. Kimura4, T. Zhang1, A. Makino4 and A. Inoue5

1Graduate school, School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
2Graduate School, Tohoku University, Sendai 980-8577, Japan
3School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
4IMR, Tohoku University, Sendai 980-8577, Japan
5WPI, Tohoku University, Sendai 980-8577, Japan

A new Cu-based Cu-Zr-Al glassy alloy has been found to exhibit very high glass-forming ability, wide supercooled liquid region and high fracture strength. The addition of Al to a binary eutectic Cu55Zr45 alloy significantly increases the stabilization of supercooled liquid as well as glass-forming ability in Cu55-xZr45Alx (x = 0 to 10) alloy series. The largest supercooled liquid region of 80 K, reduced glass transition temperature of 0.60 and γ value of 0.417 are simultaneously obtained for a ternary eutectic Cu47Zr45Al8 alloy, which can fabricate fully glassy sample with critical diameters up to 15 mm by copper mold casting. The bulk glassy alloy also exhibits high compressive fracture strength of over 1900 MPa and the high Young's modulus above 100 GPa.

(Received 2009/12/1; Accepted 2010/2/2; Published 2010/3/17)

Keywords: glassy alloy, copper-based alloy, thermal stability, glass-forming ability, mechanical property

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