High strength and high ductility in nanostructured aluminium-based intermetallics produced by high-pressure torsion

Kaveh Edalati, Zen Ji Horita

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

1 被引用数 (Scopus)

抄録

Aluminium-based intermetallics (aluminides) exhibit high strength, but low plasticity at room temperature. Despite approaches employed for improvement of their mechanical properties, there is a trade-off between the strength and the plasticity in intermetallics. In this study, several nanostructured aluminium-based intermetallics (AlNi, TiAl, Ni2AlTi) with ultrahigh compressive strength, up to 3.5 GPa, and high plasticity, up to 23%, are produced in situ from elemental powders by severe plastic deformation using high-pressure torsion (HPT) at 573 K and subsequent annealing at 673 or 873 K. It is shown that the high work-hardening behavior and plasticity in these intermetallics are due to (i) nanotwin formation, (ii) bimodal microstructure, and (iii) activation of different deformation mechanisms such as dislocation slip, twinning and grain boundary sliding. The diffusivity appears to increase by 12-22 orders of magnitude during HPT because of ultrahigh vacancy concentration and high dislocation density, which results in the formation of intermetallics at low temperatures.

本文言語英語
ホスト出版物のタイトルLight Metals Technology 2013
出版社Trans Tech Publications Ltd
ページ558-562
ページ数5
ISBN(印刷版)9783037857663
DOI
出版ステータス出版済み - 2013
イベント6th International Light Metals Technology Conference, LMT 2013 - Old Windsor, 英国
継続期間: 7 24 20137 26 2013

出版物シリーズ

名前Materials Science Forum
765
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

その他

その他6th International Light Metals Technology Conference, LMT 2013
Country英国
CityOld Windsor
Period7/24/137/26/13

All Science Journal Classification (ASJC) codes

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

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