AA7xxx alloy in order to reduce the grain size of with addition of AA7xxx+0.5% SC; Study their Microstructure, Mechanical properties, Thermal properties and Stress Corrosion cracking behaviour

Abstract

Purpose- In order to reduce the grain size with addition AA-7xxx+Sc alloy, study their mechanical properties, microstructure and corrosion behaviour of AA-7xxx with AA-7xxx + wt% (0.5Sc) alloys. Precipitation hardening of above conditions was investigated.

Design/methodology/approach- Precipitates at different age-hardening conditions were measured of nano scale precipitates MgZn2, Al2Cu and Al3Sc. The precipitation hardening behaviour of AA-7xxx+0.5 wt.% Sc alloys are studied on the basis of optical microscopy, electron microscopy (SEM & TEM), XRD observations, mechanical properties and electrochemical analysis.

Findings- AA 7xxx and AA-7xxx+0.5 wt.% Sc alloys were developed casting method and comparing mechanical properties, microstructure and stress corrosion cracking behaviour of using 3% NaCl solution medium to understand the corrosion behaviour of alloy such as AA 7xxx and AA-7xxx+0.5 wt.% Sc ally , AA-7xxx+0.5 wt.% Sc precipitation hardened (T6) alloy.

Originality/value- Hardness, mechanical properties and Stress corrosion cracking behaviour of AA-7xxx with AA-7xxx + wt% (0.5Sc) alloys and understand the corrosion behaviour of alloy such as AA 7xxx and AA-7xxx+0.5 wt.% Sc ally , AA-7xxx+0.5 wt.% Sc precipitation hardened (T6) alloy and potentio-dynamic polarization (PDP) curves.