Finite Element Simulation of Deformation Behaviour of Aluminium Alloy Processed by Cyclic Constrained Groove Pressing

Abstract

Background and Objective: Cyclic constrained groove pressing (CCGP) is a SPD technique which is applicable for metallic sheets or plates and can produce fine grained structures for various applications. The aim of the present study was to understand the impact of CCGP processing on the behaviour of 6061 aluminium alloy. Materials and Methods: A hydraulic press with suitable dies was used in the process to corrugate and straighten the specimens. Samples in “as cast” conditions were processed by CCGP with 0, 1, 2, 3 and 4 passes. The samples obtained were characterized for their hardness and tensile strength. Advanced tools such as finite element method (FEM) and scanning electron microscopy (SEM) have been used in order to better explain the process and the results obtained. Results: It was observed that the grain refinement, hardness and tensile strength of the samples increased with the number of CCGP passes. The hardness of the specimen was found to increase with the number of passes of corrugation and straitening from 29-50 HV 10. Tensile strength of the specimen was found to increase with the number of passes of corrugation and straitening from 60-145 MPa. The SEM analysis of the fractured specimens due to tensile testing of the UFG samples showed that they have a dimple structure characteristic. Conclusion: The study revealed that the hardness of the specimen increased with the number of passes of corrugation and straitening from 29-50 HV 10. Tensile strength of the specimen was found to increase with the number of passes of corrugation and straitening from 60-145 MPa. The SEM analysis of the fractured specimens due to tensile testing of the UFG samples showed that they have a dimple structure characteristic.