2524鋁合金的蠕變時效行為Creep ageing behavior of 2524 aluminum alloy

采用拉伸測試、維氏硬度測試和透射電鏡分析等方法研究實驗應力和時效時間對2524鋁合金蠕變時效行為的影響。結果表明：時效時間和試驗應力對材料的成形與微觀組織均有較大的影響，應力越大、時間越長，蠕變行為越明顯；在190 ℃溫度下，試驗應力為180 MPa，時效時間約為12 h時，材料的硬度和強度趨近于峰值；TEM分析表明，合金板材強度和伸長率的差別主要由時效后強化相S′相和S″相的尺寸和分布密度決定；采用線性回歸方法獲得合金在190 ℃下穩態蠕變速率與實驗應力的本構關系。

The creep age forming effects of 2524 aluminum alloy at different stresses and aging times were investigated through tensile performance, Vickers hardness and TEM. The results show that the aging time and stress have great effect on not only creep behavior but also microstructure of 2524 aluminum alloy. And the creep behavior will become stronger with heavier stress and longer time. The hardness and strength of material will tend to be peak at 190 ℃ when the test-stress reaches 180 MPa and ageing time is 12 h. It can be concluded that the differences of strength and elongation of the alloy plate are determined by the size and distribution of S″ and S′ phase. Finally, the constitutive relationship between the steady creep rate and stress of 2524 aluminum alloy at 190 ℃ is obtained by linear regression.

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