ISSN:
1013-9826
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:
Accumulative roll-bonding (ARB) process was applied to an oxygen free copper forimprovement of the mechanical properties via ultra grain refinement to nanometer order level.Two copper sheets 1mm thick, 30mm wide and 300mm long are degreased and wire-brushed forsound bonding. The sheets are then stacked to each other, and cold-roll-bonded by 50%reduction rolling. The sheet is then cut to the two pieces of same length and the same procedurewas repeated to the sheets. The ARB process up to eight cycles (an equivalent thickness strain of6.4) is successfully performed at ambient temperature. TEM observation reveals that ultrafinegrains, hardly containing the dislocation interior, begin to develop at the third cycle, and afterthe sixth cycle they cover most of regions of samples. The morphology of ultrafine grainsformed is different from that of aluminum alloys. Tensile strength of the ARB-processed copperincreases with the equivalent strain up to a strain of ~3.2, in which it reached 390 MPa, ~2.1times higher than the initial value. However, the strength hardly changed at the strain above ~3.2
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.239.pdf
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