Effects of shot peening on the nanoindentation response of Cu 47.5Zr47.5Al5 metallic glass

J. Fornell, A. Concustell, A. L. Greer, S. Suriñach, M. D. Baró, J. Sort

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

The effects of shot peening (SP) on the nanoindentation response of Cu 47.5Zr47.5Al5 metallic glass, both in the as-cast state and after thermally induced structural relaxation (i.e., after annealing close to the glass transition), are investigated. As expected, annealing causes an increase of hardness attributable to annihilation of free volume. Conversely, nanoindentation tests, carried out on a transverse section at different distances from the SP surface, reveal that SP induces mechanical softening. Both the hardness and the reduced Young's modulus progressively decrease as the peened surface is approached. Finite-element simulations of the nanoindentation curves indicate that the cohesive stress and the Mohr-Coulomb friction coefficient also decrease after SP, an observation which is in line with the induced mechanical softening. Differential scanning calorimetry measurements reveal an increase of the relaxation enthalpy, particularly when SP is performed on the previously annealed metallic glass, consistent with deformation-induced creation of free volume. © 2012 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalJournal of Alloys and Compounds
Volume586
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • Mechanical properties
  • Metallic glasses
  • Microstructure
  • Shot peening

Fingerprint Dive into the research topics of 'Effects of shot peening on the nanoindentation response of Cu 47.5Zr47.5Al5 metallic glass'. Together they form a unique fingerprint.

  • Cite this