Journal of Materials Science

, Volume 49, Issue 19, pp 6487–6496 | Cite as

Review: achieving superplasticity in metals processed by high-pressure torsion

  • Megumi Kawasaki
  • Terence G. Langdon
Ultrafinegrained Materials


It is now well established that processing by equal-channel angular pressing (ECAP) leads to grain refinement and produces materials having the potential for exhibiting extensive superplastic flow at elevated temperatures. High-pressure torsion (HPT) is also an effective procedure for refining the grain sizes of polycrystalline metals to the submicrometer or even the nanometer level, and recent results show that this processing method also gives materials that exhibit excellent superplastic characteristics. This report examines the various publications describing superplasticity in metallic alloys processed by HPT. A comprehensive tabulation is presented listing all of the results to date showing true superplastic elongations of at least 400 % after processing by HPT. Examples of superplastic elongations are described for tensile tests conducted using specimens cut from either disk or ring samples. An analysis shows that the flow behavior of various Al and Mg alloys is in good agreement with the predicted flow behavior for conventional superplastic materials.


Severe Plastic Deformation Initial Strain Rate Superplastic Flow Severe Plastic Deformation Processing Ring Sample 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This work was supported in part by the National Science Foundation of the United States under Grant No. DMR-1160966 and in part by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS.


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© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Division of Materials Science and EngineeringHanyang UniversitySeoulSouth Korea
  2. 2.Departments of Aerospace & Mechanical Engineering and Materials ScienceUniversity of Southern CaliforniaLos AngelesUSA
  3. 3.Materials Research Group, Faculty of Engineering and the EnvironmentUniversity of SouthamptonSouthamptonUK

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