Transactions of Materials and Heat Treatment

Title：Regularity of material structure evolution in equalchannel angular pressing

Authors： WANG Jian-min 1 XU Xiao-jing 1 SHI Feng-jian 2 Jiang Yin-fang 1 (1.School of Material Science and Technology Jiangsu University Zhenjiang Jiangsu 212013 China 2.School of Material Science and Technology Jiangsu University of Science and Technology Zhenj

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KeyWords： equal-channel angular pressing (ECAP) ultra-fine grain evolution of fine grained microstructure severe plastic deformation

ClassificationCode：TG376

year,vol(issue):pagenumber：2005,30(2):41-43

Abstract：

This paper describes the principle of equal channel angular pressing (ECAE/ECAP) to make ultra-fine grain structure material. The experiment takes the purity copper bar as the sample which are subjected to several pressings. After equal-channel angular pressings, there are a large number of dislocation twines and dislocation grains and with the consequent deformation developed, sub-grain bands will be become equiaxial grains. After four pressings, bandings of structure and texture are vanished and after that with the severe shearing function grain boundaries are continually thickened and revolved. So the homogeneous high angle boundaries ultra-fine grains which are about 500nm～1μm can be achieved.

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Reference：

[1]HuangWH,ChangL,KaoPW,ChangCP.Effectofdie angleondeformationtextureofcopperprocessedbyequalchannelangularextrusion[J].MaterialsScienceandEngi neeringA,2001,307(1-2):113118.
[2]HoritaZ,FurukawaM,NemotoM,etal.Developmentoffine grainedstructuresusingsevereplasticdeformation.MaterialsScienceandTechnology[J],2000,16(1112):12391245.
[3]YoshinoriI,WangJingtao,HoritaZ,etal.,Principleofequal chan nelangularpressingfortheprocessingofultra finegrainedmaterials[J].ScriptaMaterialia,1996,35(2):143146.

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