Microstructures and mechanical properties of HPT processed 6063 Al alloy

Das, Mousumi and Das, Goutam and Ghosh, M and Wegner, Matthias and Rajnikanth, V and Ghosh Chowdhury, S and Pal, T K (2012) Microstructures and mechanical properties of HPT processed 6063 Al alloy. Materials Science and Engineering A, 558 (IF-2.108). pp. 525-532.

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6063 Al alloy is subjected to severe plastic deformation through high-pressure torsion (HPT) using disk samples. The values of the Vickers microhardness and equivalent strain were recorded along diameters in each disk. The microhardness of 6063 Al alloys increases strongly and continuously with increasing equivalent strain but levels off and enters into a steady-state where the hardness remains unchanged with further straining. It is confirmed that the yield and ultimate tensile strength also follows the same single role of the equivalent strain as the hardness. Transmission electron microscopy showed that a subgrain structure develops at an initial stage of straining with individual grains containing disloca- tions. When increasing the straining, the subgrain size decreases whereas the misorientation angle increases and more dislocations are formed within the grains. In the steady-state range, some recrystallized grains formed which are free from dislocations. The mechanism for the grain refinement is discussed in terms of dislocation mobility.

Item Type:Article
Official URL/DOI:http://dx.doi.org/10.1016/j.msea.2012.08.040
Uncontrolled Keywords:Severe plastic deformation (SPD), High-pressure torsion(HPT), Transmission electron microscopy (TEM), 6063Al alloy Ball indentation technique Fine precipitation
Divisions:Material Science and Technology
ID Code:5981
Deposited By:Dr. A K Sahu
Deposited On:03 Sep 2012 10:41
Last Modified:18 Jun 2020 10:28
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