Developing a Model for Grain Refinement in Equal-Channel Angular Pressing

Abstract:

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It is now recognized that processing by equal-channel angular pressing (ECAP) leads to very significant grain refinement in polycrystalline materials with the as-pressed grains typically having sizes within the submicrometer range. Furthermore, the materials produced by ECAP exhibit many useful properties including a high strength at ambient temperatures and, if these ultrafine grains are retained to elevated temperatures, a potential for superplastic forming. This paper examines the fundamental characteristics of grain refinement by making use of two sets of experimental observations: experimental data obtained from the pressing of aluminum single crystals through one pass of ECAP and hardness measurements taken on polycrystalline aluminum for samples subjected to ECAP for up to a total of eight passes. These experimental results are used to develop a microstructural model that provides a satisfactory explanation for the grain refinement occurring in ECAP.

Info:

Periodical:

Materials Science Forum (Volumes 503-504)

Edited by:

Zenji Horita

Pages:

19-24

DOI:

10.4028/www.scientific.net/MSF.503-504.19

Citation:

C. Xu et al., "Developing a Model for Grain Refinement in Equal-Channel Angular Pressing", Materials Science Forum, Vols. 503-504, pp. 19-24, 2006

Online since:

January 2006

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Price:

$35.00

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