|dc.description.abstract||There are three kinds of aluminum alloys investigated in this paper. One is extruded 6N01 alloy, others are rolled 6022、6111 alloys. To discuss the bending ability of 6022,6111 alloys with the experiment the parameters including of (1)different chemical compositions,solution temperature,cooling rate after solution and (2)low temperature aging.
For 6N01 alloy, we are interested in finding(1)bending ability by using different chemical compositions,re-heating temperature,cooling rate after re-heating and 175℃ artificial aging for different time (2) the influence of different chemical compositions,pre-aging on the aging precipitation behavior after artificial aging.
Precipitation behaviors of the alloys were analyzed using different scanning calorimetry (DSC) and by measuring the resistivity, observation of fracture type and microstructure by scanning electron microscope (SEM) and transmission electron microscope (TEM), formability attained by bending test. The tensile test was performed to obtain the mechanical properties of the alloys.
The results indicate that the bending ability of 6022,6111 alloys with different chemical compositions,solution temperature,cooling rate after solution and low temperature aging is good, and they have high elongation. 6N01 alloys with lower strength and higher elongation can get better formability. Low re-heating temperature increases bending ability.6N01PB,6N01PS,6N01PM alloys pre-aged for -10~30℃ for long time will have negative effect after artificial aging, but positive effect for 50~70℃.||en_US|