High Strain Behaviour of Ultrafine‑grained Aluminium Alloys Processed Through the Severe Plastic Deformation Techniques: A Review

Abstract

In the present study, the various literature based on the high strain rate behaviour of the ultrafine-grained (UFG) aluminium alloys produced through severe plastic deformation techniques have been discussed. It was observed from various literature that under the high strain rate from (3000–120000 s−1) adiabatic shear bands (ASBs) were formed which is the main reason for dynamic failure. These ASBs were the main reason for the failure of Al alloys when they were exposed to high impact. The adiabatic shear bands are mainly of two types i.e. deformed and transformed ASBs. As the strain rate increased, the deformed ASBs formed at the initial stage of adiabatic shear localization and further changed into transformed ASBs. It was found that deformed ASBs were formed in 6061-T6 Al alloy at the strain rate of 6754 s−1, which further helped in resisting the sudden failure. It was observed that UFG 6061 aluminium alloy processed through friction stir processing (FSP) at cryogenic temperature (173 K) shows maximum strain hardening at the strain rate of 120000 s−1 as compared to other reported studies.