Strengthening of alloys with elastic anisotropy by severe plastic deformation

Shigeru Kuramoto, Tadahiko Furuta, Naoyuki Nagasako, Zenji Horita

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

Abstract

Effects of the elastic anisotropy on deformation behavior are examined in a Ti-23%Nb-0.7%Ta-2%Zr-1.2%O (in at %) alloy, Gum Metal, and in an Fe-19%Ni-34%Co-8%Ti alloy with body centered cubic (bcc) crystal structure, and microstructural development in the iron based alloy during severe plastic deformation (SPD) process is discussed. Strong elastic anisotropy with reduced shear modulus, C 11- C 12, results in low ideal shear strength, which implies dislocation mediated plasticity easily occurs at lower stress. On the other hand, high pressure torsion (HPT), a typical SPD method, realizes very high shear stress during processing, which seems to reach the ideal shear strength in these alloys. Significant refinement of the grain size to 20 - 50 nm in the Fe-Ni-Co-Ti alloy is discussed in relation to the unique deformation mechanism which might be activated at ideal shear strength.

Original languageEnglish
Title of host publicationTHERMEC 2011
Pages1799-1804
Number of pages6
DOIs
Publication statusPublished - Jan 30 2012
Event7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011 - Quebec City, QC, Canada
Duration: Aug 1 2011Aug 5 2011

Publication series

NameMaterials Science Forum
Volume706-709
ISSN (Print)0255-5476

Other

Other7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
CountryCanada
CityQuebec City, QC
Period8/1/118/5/11

All Science Journal Classification (ASJC) codes

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

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