Study of Dynamic Mechanical Properties and Microstructures of Aluminium 7075 T651 Alloy by using Split-Hopkinson Pressure Bar and Universal Testing Machine

Aluminium 7075 T651 alloy is an advanced high-strength, precipitation hardened alloy extensively used in aerospace and automotive structural components due to its exceptional strength-to-weight ratio and superior fatigue resistance. A comprehensive evaluation of the Aluminium 7075 T651 alloy under quasi-static compression utilized the Universal Testing Machine (UTM) at room temperature followed by high strain rates between 1138–2534 s−1 and the lower strain rate of 10−4−1s through Split-Hopkinson Pressure Bar (SHPB). Microstructural changes were recorded by using Scanning Electron Microscope (SEM) after exposing the material. The SHPB apparatus compressed cylindrical specimens measuring 6 mm in height with a 6 mm diameter. The strain rate, withdrawal stress, and yield stress both escalated while the strain hardening exponent (n value) grew when compared to impact velocity test rates at high strain rates in contrast to slow strain rate tests. The microscopic analysis demonstrated grains of the Al matrix experienced elongation after the high strain rate test operation. The mechanical characteristics of Aluminium 7075 T651 strengthen dynamically due to microstructural variations and strain rate-dependent strengthening mechanisms. Research findings obtained from this study lead to beneficial data for designing and deploying this alloy in high-strain- rate applications to create safer more efficient engineering components.