한국주조공학회

In this paper tensile strength and fatigue propagation rate were investigated by aging treatment (T_6) and thermomechanical treatment (TMT) of 7075-Al Alloy specimen. The results of teat showed that TMT improved tensile strength and fatigue crack propagation due to bomogenization of microstructure. In TMT, the results of comparison between T-H' AHA and T-AHA and T-AH and T-HA were showed that T-AHA and T-AH treatments, after solution treatment, which are aging treated before rolling have higher tensile strength. Our investigation on high temperature stability at the Specimen for T_6, T-AHA, $T-AH treatments resulted in rapid reduction of tensile strength over 150℃, but the reduction of tensile strength for specimen of TMT was smoothed than T_6.