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首页> 外文期刊>Journal of Materials Engineering and Performance >Optimization of Hot Deformation Parameters and Constitutive Analysis for As-Cast Mg-5Li-3Zn-0.3Y Alloy Using Processing Maps
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Optimization of Hot Deformation Parameters and Constitutive Analysis for As-Cast Mg-5Li-3Zn-0.3Y Alloy Using Processing Maps

机译：使用加工地图优化铸造Mg-5Li-3zn-0.3Y合金的热变形参数和本构体易分析

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摘要

Hot deformation behavior of as-cast Mg-5Li-3Zn-0.3Y (wt.%) alloy has been studied by establishing processing maps covering the range of 200-450?°C in temperature and 0.001-10?s_(?1)in strain rate. The map corresponding to the strain of 0.7 reveals that a domain of dynamic recrystallization occurred at 340-400?°C/0.01-0.158?s_(?1)with its peak efficiency of approximately 31%. Analysis of the flow behaviors and microstructural observations indicated that dynamic recrystallization occurred in the domain, in which fine microstructure can be achieved. The above conditions represent the optimum processing parameters, and the flow instability regimes are also recognized from the maps. The average deformation in the deformed range was 136.414?kJ/mol which is close to that for lattice self-diffusion in magnesium and far smaller than that for as-cast Mg-5.75Zn-0.73Y-0.36Zr (wt.%) alloy. It is believed that a lower activation energy for Mg-5Li-3Zn-0.3Y alloy can partly result from both the weak particle pinning effects and adding Li into the Mg-Zn-Y-Zr alloy. Results of extrusion experiments conducted at 350?°C show that the alloy can be easily extruded with good mechanical properties of the yield strength of 132?MPa, the fracture strength of 215?MPa and the elongation of 20.9%, and the grains can be well refined.
机译：通过建立温度范围为200-450°C范围和0.001-10Ω_（α1），研究了AS铸造Mg-5LI-3ZN-0.3Y（WT.％）合金的热变形行为。以应变率。对应于0.7的应变对应的地图显示，动态重结晶的结构域发生在340-400？°C / 0.01-0.158？S _（α1），其峰值效率约为31％。流动行为的分析和微观结构观察表明，在畴中发生动态重结晶，其中可以实现细微结构。上述条件代表了最佳处理参数，并且还可以从地图中识别出流量不稳定性。变形范围内的平均变形为136.414Ω·kj / mol，其接近镁的晶格自扩散，远小于铸造Mg-5.75zn-0.73Y-0.36 zr（wt.％）合金的晶格自扩散。据信，用于Mg-5LI-3ZN-0.3Y合金的较低激活能量可以部分地由弱颗粒钉凝固效应和加入Mg-Zn-Y-Zr合金中的两者。在350℃下进行的挤出实验结果表明，合金可以容易地用良好的机械性能挤出132μm≤215Ω·MPa，裂缝强度和20.9％的伸长率，并且颗粒可以是精制。

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