Abstract: Effect of parking time after solution treatment on the bending properties of 6005A aluminum alloy profiles and effect of aging delay time on the properties of alloy profiles were systematically investigated by means of tensile, hardness and conductivity tests. The results show that the strength of alloy rises rapidly within 48 h after solid solution, and the tensile and yield strengths rise from 140.5 MPa and 37 MPa to 207 MPa and 96 MPa, respectively, the hardness rises from 43.6 HV to 66 HV. Through the cupping value and the change of the work hardening exponent n value, it is pointed out that the optimal parking time after solid solution should not exceed 24 h. When aging delay time is within 3 h, the properties of the alloy changes sigificantly, the tensile strength and yield strength decrease from 293.3 MPa and 277 MPa to 262 MPa and 245 MPa, and the elongation decreases from 15% to 12.6%, the best aging delay time should be less than 3 h. After the delay time exceeds 10 d, the tensile and yield strengths drop to 256 MPa and 231 MPa, respectively, in a “cliff-like” manner.

Key words: 6005A aluminum alloy, parking effect, bending profile, mechanical properties