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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effect of silicon on atomic distribution and shape memory in Fe-Mn base alloys
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Effect of silicon on atomic distribution and shape memory in Fe-Mn base alloys

机译：硅对Fe-Mn基合金中原子分布和形状记忆的影响

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摘要

Electron spin resonance and transmission electron microscopy are used for studying the ordering-clustering-precipitation phenomenon in Fe-Mn base austenitic solid solutions. The effect of 5 percent of Si on the short-range atomic order in the Fe alloys containing (mass percent) 17Mn, 9Cr and 4N1 was derived from the analysis of change in the temperature dependence of magnetic susceptibility caused by single atoms of d-elements and their clusters. It is shown that Si increases the size of superparamagnetic clusters consisting mainly of Mn atoms. The size of the clusters was estimated to be of about 1.6 nm in the Si-free and 2.1 nm in the Si-added alloy. Based on the Si-increased concentration of conduction electrons and previously observed correlation between the electronic structure and short-range atomic ordsr, it is concluded that, due to prevailing Fe-Si atomic bonds, the Mn atoms are pushed out of the solid solution thereby forming the clusters. This conclusion is supported by TEM observation of precipitates after ageing at 873 K for 36 h. The increase in the Mn content up to 20mass percent in the alloy Fe-20Mn-9Cr-6Si and to 31 mass percent in the alloy Fe-3 lMn-6Si enhances the precipitation of particles having the crystal structure and lattice parameters of (3-Mn and the size of 5-25 mn. TEM data are consistent with Thermo Calc calculations of the phase equilibrium, according to which the addition of 6 mass percent of Si to the Fe-Mn system shifts the concentration border of (3-Mn phase stability at 873 K from 55 down to 25 percent of Mn. Clusters and precipitates with structure of (3-Mn are considered to be responsible for a positive effect of Si on shape memory in Fe-Mn base alloys.
机译：电子自旋共振和透射电子显微镜用于研究Fe-Mn基奥氏体固溶体中的有序-成簇-沉淀现象。通过分析由d元素单原子引起的磁化率对温度依赖性的变化分析，得出5％的Si对含（质量百分比）17Mn，9Cr和4N1的Fe合金中短程原子序的影响。及其集群。结果表明，Si增加了主要由Mn原子组成的超顺磁簇的尺寸。无硅团簇的尺寸估计为约1.6nm，而添加硅的合金团簇的尺寸约为2.1nm。基于增加的硅的导电电子浓度和先前观察到的电子结构与短程原子序数之间的相关性，得出的结论是，由于主要的Fe-Si原子键，Mn原子因此被从固溶体中推出。形成集群。 873 K老化36 h后的TEM观察表明，该结论得到了支持。 Mn含量在Fe-20Mn-9Cr-6Si合金中达到20质量％，在Fe-3 lMn-6Si合金中达到31质量％，这会增加具有（3- Mn和5-25百万大小的TEM数据与相平衡的Thermo Calc计算一致，根据该计算，在Fe-Mn系统中添加6质量％的Si会改变（3-Mn相的）浓度边界从5％到25％的Mn在873 K时具有最大的稳定性。具有（3-Mn）结构的簇和析出物被认为是Si对Fe-Mn基合金形状记忆的积极影响。

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