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基于Murty準則的ZnAl10Cu2合金熱變形機制
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-09-21
在Gleeble?1500D熱模擬機上研究了ZnAl10Cu2合金在變形溫度為180～330 ℃、應變速率為0.01～10 s?1、最大變形量為0.7條件下的熱變形行為，采用動態材料模型的Murty失穩準則繪制了ZnAl10Cu2合金的熱加工圖，結合微觀組織觀察研究了該合金在實驗條件下的微觀變形機制及流動失穩現象，并優化了熱變形的工藝參數。
基于Murty準則的ZnAl10Cu2合金熱變形機制Hot deformation mechanism and process optimization for?ZnAl10Cu2 alloy based on Murty criterion
?在Gleeble?1500D熱模擬機上研究了ZnAl10Cu2合金在變形溫度為180～330 ℃、應變速率為0.01～10 ?s?1、最大變形量為0.7條件下的熱變形行為，采用動態材料模型的Murty失穩準則繪制了ZnAl10Cu2合金的熱加工圖，結合微觀組織觀察研究了該合金在實驗條件下的微觀變形機制及流動失穩現象，并優化了熱變形的工藝參數。結果表明：ZnAl10Cu2合金在高應變速率區域容易發生流變失穩現象，45°剪切開裂、絕熱剪切帶和局部塑性流動是流動失穩區的主要變形機理，在變形安全區片狀α1和α2相均發生了不同程度的球化和扭折，且基體β相發生了動態再結晶，在變形溫度為240 ℃、應變速率為0.1 s?1時，能量耗散率達到峰值，約為53%。
The hot deformation behavior of ZnAl10Cu2 alloy was studied by compression testing on a Gleeble?1500D simulator in the temperature range from 180 ℃ to 330 ℃ and true strain rate range from 0.01 s?1?to 10 s?1at the maximum true strain of 0.7. A processing map was developed on the basis of Murty instability criterion of dynamic material model. The micro-deformation mechanism and the flow instability phenomena of ZnAl10Cu2 alloy were studied by the microstructure under the experimental conditions, and the optimum processing parameters were evaluated. The results show that ZnAl10Cu2 alloy exhibits flow instability at high strain rate. The 45° shear cracking, adiabatic shear band and the local plastic flow are the main deformation mechanisms. The globalization and kinking of the laminar α1?and α2?phases are observed in the stable domain, and the dynamic recrystallization of β phase is also observed in the stable domain. At deformation temperature of 240 ℃ and strain rate of 0.1 s?1, the power dissipation rate reaches the peak, which is about 53%.
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