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Effect of channel angle on the material flow and hardness distribution during incremental ECAP of Al-1050 billets

Salamati, Mohammad and Qarni, Muhammad Jawad and Tamimi, Saeed and Rosochowski, Andrzej (2016) Effect of channel angle on the material flow and hardness distribution during incremental ECAP of Al-1050 billets. In: The 19th International ESAFORM Conference on Material Forming, 2016-04-27 - 2016-04-29, Nantes Congress Center.

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Incremental equal channel angular pressing (I-ECAP) is an extension of the classical ECAP method used to produce ultrafine grained (UFG) metals. This paper investigates the first pass of I-ECAP performed on AA-1050 billets measuring 10x10x60mm and the effects of processing with two different dies with the channel intersection angle ϕ=90° and ϕ=120°. The forces required to produce billets were examined and compared. Micro hardness measurements were performed to create a hardness distribution contour map and to evaluate the strain distribution. Moreover FE simulations were performed to investigate the plastic strain distribution within the billets. It was found that using the ϕ=90° die results in higher deformation forces and also greater uniformity of strain distribution when compared to billets processed with ϕ=120° die. The experimental results correlated well with the findings of the simulations.