MATEC Web of Conferences (Jan 2015)

Developing ultrafine-grained materials with high strength and good ductility for micro-forming applications

  • Huang Yi,
  • Xu Jie,
  • Langdon Terence G.

DOI
https://doi.org/10.1051/matecconf/20152107002
Journal volume & issue
Vol. 21
p. 07002

Abstract

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Materials with ultrafine grain sizes are attractive for use in micro-forming operations. High-pressure torsion (HPT) is an effective technique that allows disc materials subjected to torsional deformation to generate microstructures with significant grain refinement. Generally, ultrafine-grained materials exhibit high strength but their ductility is limited because they have both a low rate of strain hardening and a low strain rate sensitivity. A special processing route by utilizing HPT and short term annealing at different temperatures was developed to obtain balanced high strength and good ductility in an ultrafine-grained Al-1% Mg alloy which will increase the production rate and quality in micro-forming.