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:
Grain refinement taking place in a commercial 7055 aluminum alloy under equal channelangular extrusion at a temperature of 250°C, was examined. The material was deformed up to atotal strain, ε, of ~12. At ε≈1, the development of subgrain bands was found. Upon further strainingthe average misorientation of deformation-induced boundaries increases; low-angle grainboundaries (LAGBs) gradually convert into true high-angle grain boundaries (≥15°) (HAGBs). Atε≈4, a structure consisting of boundaries with low and high angle misorientations was observed. Atε≈12, a structure with an average grain size of ∼0.7 µm was formed. This size is roughly similar tothat for subgrains developed at preceding strains. It was shown that the formation ofsubmicrocrystalline grains occurs through continuous dynamic recrystallization both along initialboundaries and within interiors of original grains as well
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.691.pdf
