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2E12鋁合金的高溫塑性變形流變應力行為2E12鋁合金的高溫塑性變形流變應力行為Flow stress behavior of 2E12 aluminum alloy during hot plastic deformation at high temperature 通過在Gleeble?l500熱模擬試驗機上進行等溫熱壓縮試驗，研究2E12鋁合金在變形溫度為300~500 ℃和應變速率為0.0l ~ l0 s?1條件下的流變應力行為，計算、推導出用包含Arrhenius項的Zener-Hollomon參數描述2E12合金高溫壓縮流變行為的表達式，并分析形變熱、變形溫度和應變速率等參數對流變應力的影響規律。結果表明：應變速率和變形溫度對2E12合金的流變應力影響顯著，流變應力隨著溫度的升高而降低，隨著應變速率的提高而增大；在 ≥1 s?1時，形變熱導致流變應力降低，且幅度隨著應變速率的增大而增大，隨著變形溫度的升高而降低。 The flow stress behavior of a hot compressed 2E12 aluminum alloy was investigated by compression tests performed on Gleeble?1500 tester at strain rates ranging from 0.01 s?1 to 10 s?1 and temperatures ranging from 300 ℃ to 500 ℃. The expression for describing the rheological behavior of 2E12 alloy during hot compression process by Zener-Hollomon parameter including Arrhenius term was deduced. The influence of temperature rise caused by deformation, testing temperature and strain rate on the flow stress was analyzed. The results show that the flow stress of 2E12 alloy is greatly affected by strain rate and temperature. The flow stress of 2E12 alloy decreases with increasing the temperature and rises with increasing the strain rate. At ≥1 s?1, temperature rise caused by deformation results in reduced flow stress. The decrease of flow stress increases with increasing the strain rate and decreases with increasing the deformation temperature.
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