Mechanical properties of the ternary L12 compound Co 3(Al, W) in singleand polycrystalline forms

Haruyuki Inui, Takashi Oohashi, Norihiko L. Okamoto, Kyosuke Kishida, Katsushi Tanaka

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The mechanical properties of Co3(Al, W) with the L12 structure have been investigated both in single and polycrystalline forms. The values of all the three independent single-crystal elastic constants and polycrystalline elastic constants of Co3(Al, W) experimentally determined by resonance ultrasound spectroscopy at liquid helium temperature are 15∼25% larger than those of Ni3 (Al, Ta) butare considerably smaller than those previously calculated. When judged from the values of Poisson'sratio, Cauchy pressure and ratio of shear modulus to bulk modulus (Gh/Bh), the ductility of Co3(Al, W)is expected to be sufficiently high. In the yield stress-temperature curve, a rapid decrease and an anomalous increase in yield stress is observed in the low and intermediate (1000-1100 K) temperature ranges, respectively. The former is concluded to be due to the solid-solution hardening effect whilethe latter is attributed to thermally activated cross-slip of APB-coupled a/2<110> superpartial dislocations from octahedral to cube slip planes.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalAdvanced Materials Research
Volume278
DOIs
Publication statusPublished - 2011 Jul 4
Externally publishedYes

Keywords

  • Cuboidal precipitate
  • Elastic property
  • L1 compound
  • Microstructure
  • Strength

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Mechanical properties of the ternary L1<sub>2</sub> compound Co <sub>3</sub>(Al, W) in singleand polycrystalline forms'. Together they form a unique fingerprint.

  • Cite this