Mechanical properties evaluation of ultra fined grained materials at low temperature

What is it about?

Creating Ultra-fine grains by severe plastic Deformation has been made by various researchers as demand of lightweight materials increases in various industries. SPD techniques have been utilised by researchers for producing UFGs. But to maintain the overall properties of the material at the same time is very difficult. To enrich the overall properties of the materials as well as alloys, Liquid nitrogen processes are involved. Processes at Cryogenic temperature improved the strengthen of the material. Comparison has been also made by various researchers and it has been noted, the properties of the materials after Liquid nitrogen improved as it compared with room temperature processes. The microstructure Evolution has also been made and it has been noticed the properties enhancement by liquid nitrogen is much more preferable than conventional processes.

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Why is it important?

The comparative study made in tables shows there is an enhancement of fracture toughness of CR+AN material due to the generation of UFG. It has been also observed CR after SPD techniques improved the fracture toughness of materials. Cross rolling at liquid nitrogen results nanostructure. During Hot cross rolling techniques, Dynamic recovery shows a governing refurbishment mechanism in the material alloys. The grains get finer and longer as the rolling strain increases. There is little change in microstructure or mechanical properties between direct and crossrolling of annealed aluminium. It has been also observed the rolling at low temperature increases the formability of the materials.