Influence of silicon additions on the microstructure and mechanical properties of Cu47Ti34Zr11Ni8 bulk metallic glass forming alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)1350-1354
Journal / PublicationMaterials Transactions
Volume48
Issue number6
Publication statusPublished - Jun 2007

Abstract

A group of (Cu47Ti34Zr11Ni 8)100-xSix(x = 0, 1, 2, 3) bulk metallic glass forming alloys with diameter of 3 mm were prepared by water-cooled copper mould cast. Microstructural investigations reveal that with increasing Si content the precipitated phases exhibit quite different morphologies, which varies from earthworm-like phase for alloys with x = 1 to small-sized dendrite phase for alloys with x = 2, and finally to developed dendritic phase for alloys with x = 3. Room temperature compression tests reveal that a transformation from shear fracture to distensile fracture mechanism occurs for the samples with Si content over a critical value. For the alloys with x = 0 and 1, fracture occurs in a shear mode with very high ultimate fracture strength. In contrast, the alloys with x = 2 and 3 seem to fracture by a distensile mode with ultimate fracture strength greatly decreased. The fracture behavior of the as-cast alloys were investigated and discussed. ©2007 The Japan Institute of Metals.

Research Area(s)

  • Bulk metallic glass, Mechanical properties, Shear bands, Shear fracture