X2A66鋁鋰合金等溫壓縮時的流變變形行為

X2A66鋁鋰合金等溫壓縮時的流變變形行為Rheological Deformation Behavior of X2A66 AluminumLithiumAlloy during Isothermal Compression

采用 Gleeble-3500 熱模擬試驗機(jī)對 X2A66 合金進(jìn)行等溫?zé)釅嚎s實驗，變形溫度為 623.15~743.15 K、應(yīng)變速率為 0.001~10 s-1，并利用雙曲正弦函數(shù)和動態(tài)材料模型，建立合金峰值應(yīng)力的本構(gòu)方程和加工圖。結(jié)果表明：X2A66 合金的流變應(yīng)力隨溫度的升高而減小，隨應(yīng)變速率的增加而增大；X2A66 合金的溫度敏感性不受應(yīng)變速率的影響，高應(yīng)變速率（應(yīng)變速率高于 0.1 s-1）時的速率敏感性高于低應(yīng)變速率時的速率敏感性。X2A66 合金等溫壓縮時峰值流變應(yīng)力和應(yīng)變速率之間滿足雙曲正弦函數(shù)關(guān)系，其本構(gòu)方程為：Σ =5.09×109[sinh(0.019σ)]^4.54414exp(–145.377/RT)。在實驗工藝參數(shù)范圍內(nèi)，X2A66 合金的失穩(wěn)區(qū)集中在高應(yīng)變速率區(qū)，當(dāng)應(yīng)變速率為 0.01~0.3 s-1，溫度為 700~743 K 時是耗散效率的峰值區(qū)域，也是 X2A66 合金最佳的熱加工工藝區(qū)。

An isothermal compression experiment of X2A66 alloy was carried out by a Gleeble-3500 thermal simulator within thedeformation temperature range of 623.15~743.15 K and the strain rate range of 0.001~10 s-1. The alloy peak stress constitutive equationand processing map were established by a hyperbolic sine function and a dynamic materials model. The results show that flow stress of thealloy decreases with the increase of deformation temperature while increases with the increase of strain rate. In addition, the strain rate hasno effect on temperature sensitivity of X2A66 alloy; the rate sensitivity at high strain rate above 0.1 s-1is higher than that at low strain rate.In isothermal compression experiment of X2A66 alloy, the relationship between the peak flow stress and strain rate satisfies the hyperbolicsine function and the constitutive equation is ?=5.09×109[sinh(0.019σ)]^4.54414exp(–145.377/RT). In the range of test parameters, theinstability zones of X2A66 alloy are mainly concentrated in the area of high strain rate. The peak area of dissipation efficiency is in the strainrate range of 0.01~0.3 s-1and the deformation temperature range of 700~743 K, which is the best thermal processing zone for X2A66.

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