Deformation behavior and indentation size effect of Au49Ag5.5Pd2.3Cu26.9Si16.3bulk metallic glass at elevated temperatures

N. Li, L. Liu, Kang Cheung Chan, Q. Chen, J. Pan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)

Abstract

Instrumented nanoindentation was conducted on an Au49Ag5.5Pd2.3Cu26.9Si16.3bulk metallic glass from room temperature to supercooled liquid region. It was found that the hardness decreases as the depth of the indentation increases at a modest loading rate (e.g. ∼0.5 mN s-1), which is known as the indentation size effect (ISE). The transition from inhomogeneous to homogeneous flow was clearly observed at the glass transition temperature. However, the deformation behavior of the metallic glass in the supercooled liquid region showed strong loading rate dependence. The deformation mode changed from homogeneous to inhomogeneous, and even exhibited a reverse indentation size effect when the loading rate was sufficiently high (i.e., ≥10 mN s-1in the study). The different deformation behaviors and indentation size effects at various temperatures and loading rates are discussed in terms of free volume theory.
Original languageEnglish
Pages (from-to)227-230
Number of pages4
JournalIntermetallics
Volume17
Issue number4
DOIs
Publication statusPublished - 1 Apr 2009

Keywords

  • B. Glasses, metallic
  • B. Internal friction
  • D. Microstructure
  • F. Mechanical testing

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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