Temperature dependence of yield stress and dislocation dissociation in L12-ordered intermetallic compounds

Haruyuki Inui, Norihiko L. Okamoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

The temperature dependence of yield stress and the associated dislocation dissociation in L12 intermetallic compounds are investigated in order to check the feasibility of the classification of L12 intermetallic compounds so far reported in terms of the planarity of core structures of partial dislocations with b = 1/2〈110〉 and 1/3〈112〉 on {111} and {001} glide planes. In contrast to what is believed from the reported classification, the motion of APB-coupled dislocations is proved to give rise to the rapid decrease in yield stress at low temperatures for Co3Ti and Co3 (Al, W). The temperature dependence of yield stress at low temperatures is newly interpreted in terms of a thermal component of solid-solution hardening, at least, for these two L12 compounds. We have proposed a new way to describe the yield stress-temperature curves of L12 compounds with three parameters (the athermal and thermal components of solid-solution hardening and the anomalous strengthening component) when the dislocation dissociation scheme is of the APB-type.

Original languageEnglish
Title of host publicationIntermetallic-Based Alloys for Structural and Functional Applications
Pages405-416
Number of pages12
DOIs
Publication statusPublished - 2011 Sep 30
Externally publishedYes
Event2010 MRS Fall Meeting - Boston, MA, United States
Duration: 2010 Nov 292010 Dec 3

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1295
ISSN (Print)0272-9172

Other

Other2010 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period10/11/2910/12/3

ASJC Scopus subject areas

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

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  • Cite this

    Inui, H., & Okamoto, N. L. (2011). Temperature dependence of yield stress and dislocation dissociation in L12-ordered intermetallic compounds. In Intermetallic-Based Alloys for Structural and Functional Applications (pp. 405-416). (Materials Research Society Symposium Proceedings; Vol. 1295). https://doi.org/10.1557/opl.2011.460