6016 aluminum alloy has a significant natural ageing effect at room tempera-ture,which seriously affects sheet formability.The yield strength of 6016 aluminum alloy in the stable state after natural ageing is 146 MPa,which is a 57％increase over the strength of the alloy in the water-quenched(W)temper.Increasing deformation temperature can significantly reduce strength and improve formability.The high-temperature deformation be-havior in reversion ageing state was investigated with a Gleeble thermo-mechanical simulator system.Yield strength at 260 ℃ is only 78 MPa,close to that of 6016W aluminum alloy at room temperature.However,the temperature gradient due to the water-cooled grips results in a heterogeneous strain field during the deformation process.More accurate mechanical properties can be obtained with a effective gauge length of 15 mm.The study provides exper-imental data for the development of new standards for thermo-mechanical tests in the future.
关键词
6016T4铝合金/自然时效/高温变形/温度梯度
Key words
6016 aluminum alloy/natural ageing/high temperature deformation/tem-perature gradient
维普
万方数据