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:
The softening behaviour during annealing was investigated in cold and hot rolledAA3103 alloys after different heat treatments. It was found that the evolution of boundary spacingdetermined using gallium enhanced microscopy gives a very good representation of the softeningbehaviour. The results show that cold rolled Al-Mn alloys soften by continuous growth of thesubgrain structure, “continuous recrystallisation”, provided the pre-treatment of the ingots has beenmade to avoid too high a density of dispersoids and the cold rolling reduction has been very large.The very high strain creates a microstructure with a large fraction of high angle boundaries that aremostly parallel to the sheet surface. A recently developed subgrain growth model which takes theeffect of solute drag into account, gives a good description of the softening kinetics. The solute dragis controlled by bulk diffusion of Mn. The simultaneous precipitation of Mn from the solid solutiontakes place by grain boundary diffusion of the Mn atoms mainly to pre-existing particles. The soluteconcentration decreases as the inverse of the boundary spacing, which is due to the grain growthmainly in the thickness (normal) direction
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1591.pdf
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