Mechanisms of Ultrafine Grain Formation in Severe Plastic Deformation

Abstract:

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The evolution mechanisms of ultrafine grains processed by severe plastic deformation are studied in ferritic steel, copper and aluminum alloys. The structural changes are characterized by the evolution of deformation bands such as microshear bands (MSBs) at moderate strains. The process of strain-induced grain formation can be subdivided in the following three stages irrespective of deformation temperature: i.e. an incubation period for new grain evolution in low strain; grain fragmentation by frequent development of MSBs in medium strain, and a full development of new grains in large strain. A mechanism of new grain formation during SPD, i.e. the MSB-based model, is proposed and discussed comparing with the subgrain-based model.

Info:

Periodical:

Materials Science Forum (Volumes 638-642)

Main Theme:

Edited by:

T. Chandra, N. Wanderka, W. Reimers , M. Ionescu

Pages:

98-103

DOI:

10.4028/www.scientific.net/MSF.638-642.98

Citation:

T. Sakai and H. Miura, "Mechanisms of Ultrafine Grain Formation in Severe Plastic Deformation ", Materials Science Forum, Vols. 638-642, pp. 98-103, 2010

Online since:

January 2010

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$35.00

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