Evolution of mechanical properties of tilt cast Zr-Cu-Al glassy alloys by annealing treatment

Yoshihiko Yokoyama, Peter K. Liaw, Raymond A. Buchanan, Akihisa Inoue

Research output: Contribution to conferencePaper

Abstract

The volume of a quenched glassy alloy is a variable of cooling rates during amorphization. Hence a change in the volume caused by the structural relaxation can be regarded as a degree of amorphousness. The density of ternary eutectic Zr50Cu40wAl10 bulk glassy alloys (BGAs) increases linearly with the annealing temperature up to the glass transition temperature (Tg). The tensile strength and Vickers hardness show constant values with the annealing temperature, and in contrast, the Charpy impact value becomes smaller, significantly. Furthermore, the fatigue limit is increased by the annealing temperature, whereas the annealed Zr50Cu 40Al10 BGA at 673 K showed no fatigue-crack-propagation marks on fractured surface. On the other hand, the compositional dependence of mechanical properties is roughly regarded as the difference of free volumes. Charpy-impact values of Zr-Cu-Al BGAs have a linear relationship with the volume change, whose value is roughly estimated to the excessive free volume. However, the compositional dependence of the Poisson's ratio indicates the intrinsic glass structure change in Zr-enriched BGAs, i.e., Zr60Cu 30Al10.

Original languageEnglish
Pages21-44
Number of pages24
Publication statusPublished - 2006 Dec 1
Event135th TMS Annual Meeting, 2006 - San Antonio, TX, United States
Duration: 2006 Mar 122006 Mar 16

Other

Other135th TMS Annual Meeting, 2006
CountryUnited States
CitySan Antonio, TX
Period06/3/1206/3/16

Keywords

  • Charpy impact test
  • Fatigue limit
  • Free volume
  • Structural relaxation
  • Vickers hardness
  • Zr-Cu-Al bulk glassy alloy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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  • Cite this

    Yokoyama, Y., Liaw, P. K., Buchanan, R. A., & Inoue, A. (2006). Evolution of mechanical properties of tilt cast Zr-Cu-Al glassy alloys by annealing treatment. 21-44. Paper presented at 135th TMS Annual Meeting, 2006, San Antonio, TX, United States.