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

Kaveh Edalati, Zen Ji Horita

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

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationLight Metals Technology 2013
Pages558-562
Number of pages5
DOIs
Publication statusPublished - Aug 30 2013
Event6th International Light Metals Technology Conference, LMT 2013 - Old Windsor, United Kingdom
Duration: Jul 24 2013Jul 26 2013

Publication series

NameMaterials Science Forum
Volume765
ISSN (Print)0255-5476

Other

Other6th International Light Metals Technology Conference, LMT 2013
CountryUnited Kingdom
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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