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:
A pure OFHC copper is subjected to severe plastic deformation (SPD) by a well defined high pressuretorsion process at ambient temperature. The change in microstructure of samples deformed todifferent strains, up to ε=64, is investigated in-situ, during annealing at 170°C, within a scanningelectron microscope. The spatial distribution of nucleation sites changes significantly withincreasing strain from nucleation at triple junctions and grain boundaries to a random distribution ofsites for von Mises equivalent strains beyond ε=4. The resulting mean size of recrystallized grains isabout 6.75 times larger than the mean microstructural size of the corresponding as-deformed state.For strains larger than ε=16 the recrystallized microstructure appears to be independent ofpreceding strain. A detailed investigation of the nucleation of recrystallized grains following verylarge strains shows that certain microstructural elements are favoured as nuclei and wereparticularly taken into account
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.1345.pdf
