Deformation behavior of Mo5Si3 single crystal at high temperatures

K. Yoshimi, M. H. Yoo, A. A. Wereszczak, S. M. Borowicz, E. P. George, E. Miura, S. Hanada

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Compressive deformation behavior of D8m-type Mo5Si3 single crystals was investigated at temperatures between 1473 and 1723 K in an argon atmosphere. Four compression axes, namely [001], near-[111], near [101] and [100] were chosen. Plasticity occured at and above 1573 K, whereas at 1473 K the crystal failed by brittle fracture before yielding. After high-temperature yielding, all crystals except the [001] crystal exhibited a large yield drop, followed by an apparent steady state flow. Slip traces of {110} and other relatively low index planes were observed on crystal surfaces. Dislocations were characterized on (001) slip plane by TEM, and <110>(001) slip was identified. Considering the constant-stress flow behavior as a steady-state creep process, it was estimated that a stress component is about 6 and an apparent activation energy of deformation is approximately 490 kJ mol-1.

Original languageEnglish
Pages (from-to)228-234
Number of pages7
JournalMaterials Science and Engineering A
Volume329-331
DOIs
Publication statusPublished - 2002 Jun 1

Keywords

  • High temperature
  • Intermetallic compound
  • Mechanical properties
  • Molybdenum silicide
  • Single crystal

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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