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Grain boundary character distribution (GBCD) plays a vital role in determining functional and mechanical properties of polycrystalline materials. Materials which contain increased fraction of interconnected special boundaries are expected to have improved resistance to intergranular corrosion or cracking. Coincident Site Lattice (CSL) boundaries, especially E3-related boundaries are mainly responsible for improvement in properties. Present work explores the changes in nature of mechanical and annealing twins during annealing of deformed Cu-5%Zn using in-situ method. Orientation maps were collected using Orientation imaging micrography (OIM) technique during heating. Results show that twin density increases rapidly starting from the on-set of recrystallization and surprisingly not all of the twins have misorientation very close to ideal one. Change in the deviation of twins progresses and reaches to saturation with recrystallization. However there are still twins with larger deviation which are left in the material even at the state of full recrystallization. Current study elucidates the broad perspective related to mechanisms of annealing twin formation. © Copyright 2015 MS&T15®.

Department of Metallurgical & Materials Engineering

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Materials Science and Technology Conference and Exhibition 2015, MS and T 2015

In-situ study of deviation of Σ3 Coincident Site Lattice boundaries during recrystallization of Cu-Zn alloy

Interstitial-free (IF) steels were rolled upto 98% of reduction in area at room temperature and even upto 97% at sub-zero temperatures of-50 to-90 C. Ultrafine-grained structure can be achieved with hardness double to that of coarse grained material by suitable flash annealing of deformed IF steel. Extent of refinement increases with lowering of rolling temperature and with increase in degree of deformation. At the initial stage of deformation, the microstructure contains bands. Their width decreases and dislocation density increases with amount of deformation. The band consists of cells/sub-grains. Cell sizes decrease with the decrease in rolling temperature as well as with the increase in amount of deformation. Below certain lower temperature ($\sim$-50 0 C), temperature has less pronounced effect on refinement. Flash annealing induces recrystallisation in cold rolled IF steel at 650 C but recrystallisation process could be advanced to 550 C due to higher defect density in cryorolled samples.