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:
Microstructural evolution taking place during equal channel angular pressing (ECAP) wasstudied in a commercial coarse-grained Al-6%Mg-0.4%Mn-0.3%Sc alloy at a temperature of 300oC(~0.6Tm). Samples were pressed using route A to a total strain of 12 and quenched in water after eachECAP pass. ECAP at moderate-to-high strains leads to the formation of a bimodal grain structure withgrain sizes of around 1 and 8 μm and volume fractions of 0.3 and 0.6, respectively. The development ofnew-grained regions has been shown to result from a concurrent operation of continuous dynamicrecrystallization that occurs during deformation and static recrystallization that occurs during each ECAPcycle by the exposure of the as-deformed material in the die kept at 300oC for around 1.5 minutes. Themicrostructural development during warm-to-hot ECAP is discussed in terms of the enhanced drivingforce for recrystallization, resulting from the evolution of high-density dislocation substructures due to thelocalization of plastic flow and inhibition of recovery in the present alloy
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.569.pdf
