Abstract
Compression test of Al 7075 T651 was carried out at high strain rates (1138 – 2534 s−1) using Split Hopkinson Pressure Bar and at slow strain rate (10−4s−1) in 100KN Universal Testing machine to understand the improvement in mechanical properties and associated changes in microstructures. Cylindrical specimens of 6 mm height and 6 mm diameter were compressed dynamically. The influence of strain rates on mechanical properties, microstructure evolution and corrosion behavior after immersion test in 3.5% NaCl solution was also investigated. Strain rate, withdrawal stress and yield stress were observed to increase with impact velocity in high strain rate tests, while in slow strain rate tests, n value was observed to increase with increasing total strain. Microstructural observations revealed that after high strain rate test, grains of Al matrix were elongated. It was observed that corrosion resistance decreased with increase in impact velocity.
Highlights
Al 7075 is a very important alloy for automobile and aeronautics industries [1]
Compression test of Al 7075 T651 was carried out at high strain rates (1138 – 2534 s-1) using Split Hopkinson Pressure Bar and at slow strain rate (10-4s-1) in 100KN Universal Testing machine to understand the improvement in mechanical properties and associated changes in microstructures
Withdrawal stress and yield stress were observed to increase with impact velocity in high strain rate tests, while in slow strain rate tests, n value was observed to increase with increasing total strain
Summary
Al 7075 is a very important alloy for automobile and aeronautics industries [1]. A days this material is used quite extensively for automotive body and aircraft structures because it has higher strength and lower weight. Split Hopkinson Pressure Bar is used [5,6,7] for high strain rate and uniaxial compression for slow strain rate deformation. By using this technique, it is proved that significant changes occurred in mechanical response under increased load or strain rate
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