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:
It is believed that the shear deformation superimposed on rolling deformation acceleratesgrain refinement. However, it has not yet been completely understood whether the grain refinement isdue to the increase in amount of equivalent strain, or the change in strain path. In the present study,three different strain paths in plane strain - (1) simple shear, (2) compression and (3) the combinationof simple shear and compression - are introduced into 1100 aluminum sheet. The recrystallizationbehaviours are compared. Plane-strain compression was achieved by a normal rolling, while thesimple shear was achieved by a continuous ECAE (conshearing). The combined strain path wasachieved by the conshearing subsequently followed by the rolling. The same amount of the equivalentstrain of 1.28 was accumulated in the three paths. The ratio of shear strain to compressive strain wasvaried by three levels in the combined strain process. After heat treatment, the material processed bythe combined strain path gave a finer recrystallized grain size than both of the monotonic strain pathsat either annealing temperature. The finest recrystallized grain size was obtained at the shear strainratio of 0.6 to the total equivalent strain. It was found that the change in strain path was effective forintroducing more new high-angle grain boundaries
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.550.315.pdf
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