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Indexed by:期刊论文

Date of Publication:2011-06-01

Journal:TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS

Included Journals:SCIE

Volume:64

Issue:3

Page Number:293-295

ISSN No.:0972-2815

Key Words:metallic glasses; alloy design; eutectic; cluster-plus-glue-atom model

Abstract:The formation of Ni-based ternary Ni-Nb-Ta bulk metallic glasses (BMGs) is explored in this work. Alloy compositions are designed by the cluster-plus-glue atom model based on a eutectic-related binary cluster Ni-Ni6Nb6, which is derived from the binary eutectic crystalline phase NiNb (Fe7W6 type). According to the cluster-plus-glue atom model, the well-known binary BMG-forming composition Ni62Nb38 can be described by a composition formula [Ni-Ni6Nb6]Ni-3 = Ni62.5Nb37.5. With an aim to further improve the glass-forming ability of the Ni-Nb alloy, Ta is selected as an alloying addition to partially replace Nb in the [Ni-Ni6Nb6]Ni-3 composition formula. The experimental results verified that BMGs with a critical size of 3 mm can be achieved at compositions [Ni-Ni6Nb6-xTax]Ni-3 (x = 0.9 similar to 1.1). Thermal and mechanical properties of the obtained BMG alloys are also investigated.