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刘文辉 邱群 周凡 陈宇强.T6时效和T6I4时效对7N01铝合金高温动态力学性能与组织演化的影响[J].稀有金属材料与工程(英文),2018,47(1):311~316.[liuwenhui.Effects of T6 and T6I4 ageing treatments on the dynamic mechanical properties and microstructure evolution of 7N01 aluminum alloy at highStemperature[J].Rare Metal Materials and Engineering,2018,47(1):311~316.]
Effects of T6 and T6I4 ageing treatments on the dynamic mechanical properties and microstructure evolution of 7N01 aluminum alloy at highStemperature
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Received:November 30, 2015  Revised:March 10, 2016
DOI:
Key words: 7N01 aluminum alloy  aging treatment  dynamic mechanical properties  precipitate
Foundation item:国家自然科学基金(51475162,51405153);湖南省自然科学基金重点项目(14JJ5015)
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liuwenhui  
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Abstract:
      The effects of T6 and T6I4 aging treatments on dynamic mechanical properties and microstructure evolution of 7N01 aluminum alloy at high temperatures were investigated by using the split Hopkinson pressure bar(SHPB), Optical Microscopy(OM) and Transmission Electron Microscopy(TEM). The results show that the dynamic yield stresses of T6I4 and T6 aging state 7N01 aluminum alloy increase with the increasing strain rate. The dynamic yield stress and dislocation density descend with the increasing temperature. The dynamic yield stress of 7N01-T6I4 aluminum alloy is higher than that of 7N01-T6 aluminum alloy at 150℃ and 250℃. At 350℃, the precipitates in 7N01-T6I4 aluminum alloy is dissolved, while the precipitates in 7N01-T6 aluminum alloy is coarsened. As a result, the dynamic yield stress of 7N01-T6I4 aluminum alloy is lower than that of 7N01-T6 aluminum alloy.