MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Thermal and Mechanical Properties of Cu-Based Cu-Zr-Ti-Y Bulk Glassy Alloys
Tao ZhangKei KurosakaAkihisa Inoue
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2001 Volume 42 Issue 10 Pages 2042-2045

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Abstract

A new Cu-based bulk glassy alloy with high tensile fracture strength above 2000 MPa was formed in a (Cu0.6Zr0.3Ti0.1)98Y2 alloy by copper mold casting. The maximum sample thickness for glass formation is 4 mm for Cu60Zr30Ti10 and increases to 5 mm for the 2%Y-containing alloy. The addition of 2%Y also causes an increase in the supercooled liquid region (ΔTx=TxTg) from 36 to 50 K and in the reduced glass transition temperature (TgTl) from 0.62 to 0.63. The increase in the glass-forming ability (GFA) is presumably due to the increase in ΔTx and TgTl. The bulk glassy (Cu0.6Zr0.3Ti0.1)98Y2 alloy exhibits good mechanical properties, i.e., 1780 MPa for yield strength, 2030 MPa for tensile fracture strength, 2100 MPa for compressive fracture strength, 1.7% for elastic elongation and 1.5% for plastic elongation. The distinct plastic elongation indicates good ductile nature of the Cu-based bulk glassy alloy. The success of synthesizing the new Cu-based bulk glassy alloy with high GFA and good mechanical properties allows us to expect the extension of application fields as a new engineering material.

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© 2001 The Japan Institute of Metals and Materials
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