本文選題：鋁合金 + 動態(tài)壓縮�。� 參考：《材料導報》2017年10期

【摘要】：采用分離式霍普金森(SHPB)壓桿裝置進行6013-T4鋁合金動態(tài)壓縮試驗,獲得溫度為25℃、100℃、200℃、300℃、400℃,應變速率為1 000s~(-1)、2 000s~(-1)、3 000s~(-1)、4 000s~(-1)、5 000s~(-1)條件下材料的真應力-真應變曲線,并通過透射電子顯微鏡(TEM)觀測了6013-T4鋁合金在不同變形條件下的組織演變。結(jié)果表明:6013鋁合金有明顯的溫度敏感性,但是對應變速率的敏感性較弱。應變速率和溫度對6013鋁合金微觀組織的影響顯著,位錯密度隨應變速率的升高而增大,隨溫度的升高而減小。基于實驗數(shù)據(jù),求得了6013鋁合金Johnson-Cook模型的本構參數(shù)并建立其本構模型。與實驗結(jié)果進行對比,結(jié)果表明,所建立的本構模型能夠很好地預測6013鋁合金的流變應力。
[Abstract]:The dynamic compression test of 6013-T4 aluminum alloy was carried out by the separation Hopkinson (SHPB) pressure rod device, and the true stress - true strain curves of the materials under the conditions of temperature of 25, 100, 200, 300, 400, 1 000s~ (-1), 2 000s~ (-1), 3 000s~ (-1), 4 000s~ (-1), 5 000s~ (-1), were observed by the transmission electron microscope. The microstructure evolution of 13-T4 aluminum alloy under different deformation conditions shows that 6013 aluminum alloy has obvious temperature sensitivity, but the sensitivity of the corresponding strain rate is weak. The strain rate and temperature have significant influence on the microstructure of 6013 aluminum alloy. The dislocation density increases with the increase of the strain rate, and decreases with the increase of temperature. The constitutive parameters of the 6013 aluminum alloy Johnson-Cook model are obtained and the constitutive model is established. The results are compared with the experimental results. The results show that the established constitutive model can predict the rheological stress of 6013 aluminum alloy well.

【作者單位】： 湖南大學汽車車身先進設計制造國家重點實驗室;湖南大學機械與運載工程學院;
【分類號】：TG146.21

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