Effect of Change in Strain Path during Cold Rolling on the Evolution of Microstructure, Texture and Hardness Properties of Different Aluminum Alloys

Saha, S and Bhattacharjee, Pinaki Prasad (2012) Effect of Change in Strain Path during Cold Rolling on the Evolution of Microstructure, Texture and Hardness Properties of Different Aluminum Alloys. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

The effect of strain path change during heavy cold rolling on the development of texture, microstructure and hardness properties is investigated in different aluminum alloys. For this purpose 99.99% aluminum (4N-Al) and Al-2.5%Mg alloy was deformed up to 90% reduction in thickness by two different rolling routes, namely, unidirectional cold rolling (UCR) and cross cold rolling (CCR). In the CCR route the specimens are rotated by 90° around the normal direction (ND) so that the transverse direction (TD) of the previous pass became the rolling direction (RD) of the present pass. The evolution of microstructure, texture was subsequently studied by X-ray and electron back scatter diffraction (XRD and EBSD, respectively). Evolution of a lamellar type deformation microstructure is observed in all materials irrespective of the processing route. The UCR processed 4N-Al shows much pronounced dynamic recovery as compared to the CCR processed materials the reasons for which need to be investigated further. In sharp contrast, the CCR processing does not affect the microstructural development of Al-Mg alloy significantly as established by the values of the various structural parameters of differently processed heavily deformed materials. This seems to originate from the much restricted dynamic recovery in Al-Mg alloy due to the presence of Mg as solute.

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