Effects of retrogression heating rate on microstructures andmechanical properties of aluminum alloy 7050

来源期刊：中国有色金属学报(英文版)2010年第6期

论文作者：李国锋 张新明 李鹏辉 游江海

文章页码：935 - 941

Key words：aluminum alloy 7050; retrogression and re-aging treatment; microstructure; mechanical properties

Abstract: The effects of the retrogression heating rate (340 ℃/min, 57 ℃/min, 4.3 ℃/min) on the microstructures and mechanical properties of aluminum alloy 7050 were investigated by means of hardness measurement, tensile properties testing, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). The results show that the retrogression heating rate significantly affects the microstructures and mechanical properties of the alloys treated by retrogression and re-aging (RRA) process, and it is found that the medium rate (57 ℃/min) leads to the highest mechanical properties. The strengthening phases in the matrix are mainly the fine dispersed η′ precipitates and GP zones, and the grain boundary precipitates are coarse and discontinuous η phases.

基金信息：the National Basic Research Program of China