摘要
采用分离式霍普金森压杆、金相显微镜、透射电镜研究了T6和T6I4两种时效处理工艺对7N01铝合金高温动态力学性能及组织演化的影响。结果表明:两种时效态的7N01铝合金的动态屈服应力均随应变速率的提高而增大。随着温度的升高,合金动态屈服应力降低,位错密度下降。在150和250℃条件下,T6I4态铝合金的动态屈服应力较T6态铝合金高。而350℃条件下,T6I4态铝合金析出相基本回溶,T6态铝合金析出相明显粗化,T6I4态铝合金的动态屈服应力较T6态铝合金低。
The effects of T6 and T614 aging treatments on dynamic mechanical properties and microstructure evolution of 7N01 aluminum alloy at high temperatures were investigated by the split Hopkinson pressure bar （SHPB）, Optical Microscopy （OM） and Transmission Electron Microscopy （TEM）. The results show that the dynamic yield stresses of 7N01 aluminum alloy in T614 and T6 aging state increase with the increasing strain rate. The dynamic yield stress and dislocation density descend with the increasing temperature. The dynamic yield stress of 7N01-T614 aluminum alloy is higher than that of 7N0 l-T6 aluminum alloy at 150 ℃ and 250 ℃. At 350 ℃, the precipitates in 7N01-T614 aluminum alloy are dissolved, while the precipitates in 7N01-T6 aluminum alloy are coarsened. As a result, the dynamic yield stress of 7N01-T614 aluminum alloy is lower than that of 7N0 l-T6 aluminum alloy.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第1期311-316,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51475162
51405153)
湖南省教育厅优秀青年基金(16B092)
关键词
7N01铝合金
时效
动态力学性能
析出相
7N01 aluminum alloy
aging treatment
dynamic mechanical properties
precipitate
