MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Synthesis and Thermal Stability of New Ni-Based Bulk Glassy Alloy with Excellent Mechanical Properties
Katuyoshi AraiWei ZhangFei JiaAkihisa Inoue
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2006 Volume 47 Issue 9 Pages 2358-2362

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Abstract

The thermal stability, glass-forming ability (GFA) and mechanical properties of the Ni-Ta-Ti and Ni-Ta-Ti-Zr glassy alloys have been investigated. As the Ti content increases, the supercooled liquid region ΔTx(=TxTg) and reduced glass transition temperature (TgTl) of Ni60Ta40−xTix glassy alloys increase, showing maximum values of 63 K at 20%Ti and 0.59 at 25 at%Ti, respectively, and then gradually decrease. The addition of Zr to Ni-Ta-Ti alloys is effective for the increase in ΔTx and TgTl. The maximum ΔTx and TgTl values of 73 K and 0.60, respectively, are obtained for Ni60Ta15Ti20Zr5 alloy. The Ni-Ta-Ti-Zr glassy alloys were formed in the rod form with diameters of over 1.0 mm by copper mold casting. The Ni-Ta-Ti-Zr bulk glassy alloys exhibit excellent mechanical properties, i.e., the compressive fracture strength (σc,f) of 3180–3220 MPa and the compressive plastic elongation (εc,p) of 0.2–0.4%.

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© 2006 The Japan Institute of Metals and Materials
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