Investigation of optimal solid solution heat treatment temperature and artificial aging time of Al7075 sheet

다국어 초록 (Multilingual Abstract)

Solid solution heat treatment test of Al7075 sheet (300x500x2.5) are performed according to temperature conditions. Peak aging heat treatment tests for solution treated Al7075 are conducted according to time conditions. T6 and T73 heat treatments are performed with the optimal conditions obtained from two experiments. In solid solution test, the highest Vickers hardness of 131.77 HV is obtained from the solution treatment at 475 °C and natural aging for 24 hours. In peak aging test, the highest hardness of 186 HV is observed at 120 °C for 24 hours. The yield strength, tensile strength, elongation, and toughness of T6 treated Al7075 (475 °C/1 hr & 120 °C/24 h) are 490.5 MPa, 550.0 MPa, 12.4 %, and 66.2 MJ/cm 3 , respectively. Meanwhile, the yield strength, tensile strength, elongation rate, and toughness of T73 treated Al7075 (475 °C/1 hr & 180 °C/24 h) are 420.0 MPa, 495.4 MPa, 13.8 %, and 49.7 MJ/cm 3 , respectively.

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