Seelam, Rajasekhar Reddy
(2016)
Effect of strain path on the evolution of microstructure and
texture of equiatomic CoCrFeMnNi high entropy alloy.
Masters thesis, Indian Institute of Technology Hyderabad.
Abstract
The effect of strain path on the evolution of microstructure and texture during cold rolling and subsequent annealing was investigated in equiatomic CoCrFeMnNi high entropy alloy. For this purpose the alloy was subjected to cold rolling up to 90% reduction in thickness by four different strain path routes namely (i) unidirectional rolling (UCR); (ii) Multi step cross rolling (MSCR); (iii) two step cross rolling (90°) (TSCR [90°]); (iv) two step cross rolling (45°) (TSCR [45°]). These deformed samples were subjected to isochronal annealing(for 1 h)at different temperatures ranging from 700°C to 1000°C and were characterized by using electron back scattered diffraction (EBSD) technique. Development of ultrafine microstructure and presence of shear bands in all deformed materials attributes to the grain subdivision at finer scale. The differently cross rolled materials shown weaker brass and stronger ND rotated brass components in contrast to UCR processed material where strong brass type texture was observed.
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