Materials Transactions Online

Materials Transactions, Vol.48 No.11 (2007) pp.3031-3033
© 2007 The Japan Institute of Metals

Fabrication of New Cu34Pd2Zr48Ag8Al8 Bulk Glassy Alloy with a Diameter of 30 mm

Qingsheng Zhang, Wei Zhang and Akihisa Inoue

Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

Glass-forming ability (GFA) of Cu36-xPdxZr48Ag8Al8 alloys was examined with the aim of developing a bulk glassy alloy with large critical diameter. It was found that the addition of 2 at% Pd significantly improved the GFA of the Cu36Zr48Ag8Al8 alloy. The fully glassy alloy rod with a diameter of 30 mm was successfully fabricated for the Cu34Pd2Zr48Ag8Al8 alloy using a copper mold casting method. The further increase of Pd content causes the decrease in the GFA. For the Cu36-xPdxZr48Ag8Al8 alloys, the Tg and Tx increase monotonously with increasing Pd content, while Tl shows a minimum value at 2 at% Pd, resulting in a maximum γ (=Tx/(Tg+Tl)) value at 2 at% Pd. The increase of γ parameter may be the reason for the significant improvement of the GFA of the quinary alloy.

(Received 2007/8/20; Accepted 2007/9/11; Published 2007/10/18)

Keywords: bulk metallic glasses, copper-zirconium-based alloys, addition of palladium, glass-forming ability

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