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

Yoshihiko Hasegawa, Norihiko L. Okamoto, Haruyuki Inui

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルIntermetallic-Based Alloys - Science, Technology and Applications
ページ177-182
ページ数6
DOI
出版ステータスPublished - 2013
外部発表はい
イベント2012 MRS Fall Meeting - Boston, MA, United States
継続期間: 2012 11月 252012 11月 30

出版物シリーズ

名前Materials Research Society Symposium Proceedings
1516
ISSN(印刷版)0272-9172

Other

Other2012 MRS Fall Meeting
国/地域United States
CityBoston, MA
Period12/11/2512/11/30

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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