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一種新型Al-Cu-Li系合金的熱壓縮流變應力

Flow stress of a new type Al-Cu-Li system alloy during hot compression deformation

  • 摘要: 采用Gleeble-1500熱模擬機高溫等溫壓縮試驗,研究了一種新型Al-Cu-Li系合金在應變速率為0.01~10s-1、變形溫度為3130~500℃條件下的流變應力特征,結果表明:流變應力隨變形溫度的升高而降低,隨變形速率的提高而增大;采用Z參數的雙曲正弦函數描述該合金高溫變形的峰值流變應力,獲得了峰值流變應力解析式,其熱變形激活能為239.02kJ·mol-1.

     

    Abstract: The flow stress behavior of a new type Al-Cu-Li system alloy during hot compression deformation was studied in the strain rate range from 0.01 to 10 s-1 and the temperature range from 300 to 500℃ by isothermal compression test on a Gleeble 1500 thermal-mechanical simulator. The results show that the flow stress of this new type Al-Cu-Li system alloy decreases with the increase of deformation temperature and increases with the increase of strain rate. The peak flow stress during high temperature deformation can be represented by Z parameter in a hyperbolic sine function. The analytical expression of peak flow stress was fitted with the hot deformation activation energy of 239.02 kJ·mol-1.

     

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