Compression deformation of single-crystal Pt3Al with the Ll 2 structure

Yoshihiko Hasegawa, Norihiko L. Okamoto, Haruyuki Inui

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


The plastic deformation behaviour of single crystals of Pt3Al with a chemical composition of Pt-27 at.%Al was investigated in compression from 77K to 1,273K. The Ll2 structure is not stable below around 220 K, transforming into either D0c, D0c' or Pt3Ga structures. {001} slip system was operative for most loading axis orientations while {111} slip system was operative for a narrow orientation region close to [001]. The CRSS for {111} slip gradually decreases in the temperature range where the Ll2 structure is stable, followed by a sharp decrease above 1,073 K, without showing positive temperature dependence. On the other hand, the CRSS for {001} slip gradually decreases below 673 K and moderately increases above 673 K. Dislocations on {111} tend to align along their screw orientation, suggesting high Peierls stress for their motion, while those on {001} are edge-oriented and fairly curved on a local scale, suggesting relatively low Peierls stress. Dislocations on both {111} and {001} with a Burgers vector b = [101] dissociate into two collinear superpartials with b = 1/2[101] separated by an anti-phase boundary.

Original languageEnglish
Title of host publicationIntermetallic-Based Alloys - Science, Technology and Applications
Number of pages6
Publication statusPublished - 2013
Externally publishedYes
Event2012 MRS Fall Meeting - Boston, MA, United States
Duration: 2012 Nov 252012 Nov 30

Publication series

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


Other2012 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA

ASJC Scopus subject areas

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


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