Diffraction strain measurements in a partially crystallized bulk metallic glass composite containing ductile particles


Balch D., Ustundag E. , DUNAND D.

JOURNAL OF NON-CRYSTALLINE SOLIDS, vol.317, pp.176-180, 2003 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 317
  • Publication Date: 2003
  • Doi Number: 10.1016/s0022-3093(02)02008-2
  • Title of Journal : JOURNAL OF NON-CRYSTALLINE SOLIDS
  • Page Numbers: pp.176-180

Abstract

In situ diffraction experiments were performed with high-energy synchrotron X-rays to examine load partitioning and high-stress relaxation during uniaxial compression of a bulk metallic glass composite containing both ductile tantalum particles and crystallized matrix material. The tantalum particles yielded at an applied stress of -800 MPa, while the matrix precipitates remained elastic up to the maximum applied stress of -1250 MPa. The von Mises effective stress in the tantalum particles at yielding was 1500 MPa, well in excess of typical tantalum yield stresses, which is attributed to a combination of solid-solution strengthening and the inhibition of dislocation motion in the 1-2 mum particles. A series of constant crosshead-position measurements made at -1250 MPa suggested the possibility of room-temperature matrix relaxation under high applied loads. (C) 2003 Elsevier Science B.V. All rights reserved.