Effect of high temperature heat treatments on the deformation behavior of Mg–2%Mn–0.7%Ce extrusions investigated by in-situ energy-dispersive synchrotron X-ray diffraction and elasto-plastic self-consistent modeling
Effect of high temperature heat treatments on the deformation behavior of Mg–2%Mn–0.7%Ce extrusions investigated by in-situ energy-dispersive synchrotron X-ray diffraction and elasto-plastic self-consistent modeling
复制标题
DOI：
10.1016/j.msea.2013.08.020
复制
发表时间：
2013-12
期刊：
影响因子：
6.4
通讯作者：
M. Lentz;M. Klaus;W. Reimers;B. Clausen
中科院分区：
文献类型：
--
作者：
M. Lentz;M. Klaus;W. Reimers;B. Clausen
分析了高温热处理对ME21挤压件变形行为的影响。在>；475℃的热处理导致显著的晶粒长大，并伴随着稀土(RE)织构成分的增强，以及镁12Ce析出物和含锰弥散体的生长。此外，分散体的数密度也大大降低。这些微观结构的变化导致了室温单轴压缩试验中断裂伸长率的急剧增加。因此，观察到的断裂伸长率高达0.7真应变。原位能量色散同步X射线衍射和弹塑性自洽(EPSC)模拟相结合的结果表明，织构的改变增加了滑移系的活性，降低了孪晶的体积分数。高应变下的变形主要是由-lt；c+a&t；-锥体和-基底滑移实现的。
The effect of high temperature heat treatments on the deformation behavior of ME21 extrusions was analyzed. Heat treatments at temperatures >475 °C result in significant grain growth with an associated enhancement of the rare earth (RE) texture component and in the growth of Mg12Ce precipitates and manganese containing dispersoids. Additionally, the number density of the dispersoids is decreased drastically. These microstructural changes produce a dramatic increase in the elongation to failure in room-temperature uniaxial compression tests. Thereby, elongations to failure up to 0.7 true strain where observed. The combination of in-situ energy-dispersive synchrotron X-ray diffraction and Elasto-Plastic Self-Consistent (EPSC) modeling shows that the texture modification increases the activity of slip-systems reducing the twin volume fraction. The deformation at high strains is predominantly realized by <c+a>-pyramidal and -basal slip.