Using Torsion to produce severe strain and ultrafine grains

Zenji Horita, Terence G. Langdon

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


    It is now well established that severe plastic deformation (SPD) leads to a very significant reduction in the grain size of many metallic materials. Processing by SPD may be achieved through torsional straining by rotating a disk around its center or by rotating a cylindrical rod about its longitudinal axis. High-Pressure Torsion (HPT) is a typical torsional straining procedure which may be used to produce an array of ultrafine grains having average sizes lying in the submicrometer or the nanometer range. Generally, the HPT process is applied to disk samples but very recent studies have demonstrated that HPT is applicable also to bulk samples. The principle of torsional straining was also recently developed as a Severe Torsion Straining Process (STSP) in which a rod is moved in a longitudinal direction while torsional strain is introduced through rotation. This report describes both the principles and some typical results attained using these various torsional straining procedures.

    Original languageEnglish
    Title of host publicationUltrafine Grained Materials IV
    Number of pages6
    Publication statusPublished - 2006
    Event2006 TMS Annual Meeting - San Antonio, TX, United States
    Duration: Mar 12 2006Mar 16 2006

    Publication series

    NameTMS Annual Meeting


    Other2006 TMS Annual Meeting
    Country/TerritoryUnited States
    CitySan Antonio, TX

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys


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