Thermoplastic deformation and micro/nano-replication of an Au-based bulk metallic glass in the supercooled liquid region

Y. C. Chen, J. P. Chu, J. S.C. Jang, C. W. Wu

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

In this paper, we reported the thermoplastic deformation and micro/nano forming ability of a Au 49Ag 5.5Pd 2.3Cu 26.9Si 16.3 bulk metallic glass (BMG) in the supercooled liquid region (SCLR) at strain rates ranging from 1×10 -4 to 3×10 -2s -1. It is found that the deformation behavior of Au-based BMG has strong dependences on strain rate and temperature applied. The strain-rate sensitivity value, obtained by the strain-rate change method, approaches an unity (Newtonian flow) at low strain rates of 10 -4s -1, but it decreases with increasing strain rate to ~0.3 (non-Newtonian flow) at 10 -2s -1. The homogeneous flow behavior is observed from the compressive test results. As the result of homogeneous flow, the deformability with a high compressive strain of ~97% is achieved. The excellent micro/nano-patterning obtained at 430K is also demonstrated for imprinted stripes with a feature size of ~156nm, signifying the good formability of this alloy in SCLR.

Original languageEnglish
Pages (from-to)488-493
Number of pages6
JournalMaterials Science and Engineering A
Volume556
DOIs
StatePublished - 30 Oct 2012

Keywords

  • Bulk metallic glasses
  • Compressive behavior
  • Homogeneous flow
  • Micro/nano-replication

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