A study on the deformation characteristic of heat-treated 6061,7075 aluminum alloy with changes of elevated temperature and strain rate for warm hydroforming

열처리된 알루미늄 6061, 7075 합금의 온간 액압 성형 적용을 위한 온도 및 변형 속도 변화에 따른 변형 특성 연구

The deformation behaviors of fully annealed or T6-treated 6061 and 7075 aluminum tubes are investigated at elevated temperature using uniaxial tensile test. Fully annealed 6061 and 7075 tube, and T6-treated 7075 tube do not show sharp local necking with an elongation of $50\%$ at tensile temperature of $300^{\circ}C$, accordingly, it is expected that warm hydroforming process can be applied. The increase of tensile temperature does not significantly affect the total elongation of T6-treated 6061 tube.