Effect of die coating on surface crack depth of hot extruded 7075 aluminum alloy

Abstract The aluminum alloys belonging to the 7000 series are high-strength used in a wide variety of products for weight reduction. They primarily field transportation and aerospace. Among these, A7075 alloy has highest strength is expected be applicable range fields, such as aircraft components sports equipment. However, it high deformation resistance prone surface defects, which called tearing. Tearing typically occurs at temperatures ram speeds, adversely affects productivity. localized melting Zn additive compounds, due heat generated during process, considered cause In this study, effect friction, heat, tearing tool—metal interface was mitigated by improving die quality. reduced friction eliminated recrystallization preventing temperature from increasing temperature. addition, an AlCrN coating adopted instead nitriding improve size when using were found limited. Moreover, grain observed region on extruded small. simulations shear coefficient m tests indicate that use improved material flow. Thus, effective reducing surface. From aforementioned results, can inferred reduce sensitivity increase productivity alloy.