Abstract
In this paper strain distribution and deformation behaviour of 4 commercially available aluminium alloys with increasing range of hardness through ECAP process is studied. Present work shows the dependencies of corner gap formation on outer arc angle and materials hardness. A circular channel ECAP die is studied in this work, which is suitable for processing both hard and soft materials. For analysing the results FEM modelling approach has been adopted, and for validating the analytical results, FEM analysis and lab experiments are performed. FEM analyses are carried out with four different aluminium alloys i.e., AL99/AA1100, AL6061/AA6061, AL7075 and AL2014 with increasing hardness. It is concluded that with increasing hardness of material and increasing outer arc angle, the corner gap formation reduces and shifts towards the first channel, the lower corner gap formation also leads to uniform distribution of equivalent strain. It is also observed that ECAP die with 30o outer arc angle, deformation is more homogenous without any strain concentration.
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