Effect of RRA Heat Treatment Parameters on Mechanical Properties Of 7075 High Strength Aluminum Alloy

Abstract

Retrogression and Re-Aging Heat Treatment improves tensile and wear resistance of aluminum alloys, to study the effect of Retrogression temperature and Retrogression time on the tensile strength, Toughness Impact and Hardness of 7075 aluminum alloy, we have applied in this research Retrogression treatments at different temperatures are 150°C, 180°C, 240°C and 370°C for 15 min, 30 min and 90 min. When the retrogression temperature was 180°C for 30 min, the alloy has reached its highest tensile strength and hardness it was respectively 586 Mpa and 165 HB, While the alloy has reached its highest impact toughness it was 32.7 J\Cm2, When the retrogression temperature was 370°C for 30 min.