ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The microstructures of pure Cu processed by equal channel angular pressing (ECAP)from 4 to 24 passes were investigated. It was found that the microstructures of Cu samples with asmall number of ECAP passes (4-8) were not inhomogeneous and the fraction of high-angle grainboundary (HAGB) was low (25~43%). While for the samples with many number of ECAP passes(12-24), the grains became more equiaxed-like and the GB misorientations exhibited double-peakdistribution with high fraction (51~64%) of HAGB. It was dislocation cells formed in large grainsof the few-pass samples, but subgrains in the many-pass samples. These characterizations suggestedthat ultrafine-grained (UFG) microstructures in the few-pass samples were not fully accomplished,while it was obtained after many passes (〉12). It is believed that dynamic recovery duringprocessing for many passes was attributed to the formation of UFG microstructures
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.333.pdf
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