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HomeMaterials Science ForumMaterials Science Forum Vols. 638-642Mechanisms of Ultrafine Grain Formation in Severe...

Mechanisms of Ultrafine Grain Formation in Severe Plastic Deformation

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Abstract:

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.

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THERMEC 2009

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Periodical:

Materials Science Forum (Volumes 638-642)

Pages:

98-103

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.98

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Online since:

January 2010

Authors:

Taku Sakai, Hiromi Miura

Keywords:

Continuous Dynamic Recrystallization, Dynamic Recovery, Grain Fragmentation, Microshear Band, Multidirectional Forging, Severe Plastic Deformation (SPD), Ultrafine Grained

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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