Influence of chemical composition and magnetic effects on the elastic properties of fcc Fe-Mn alloys
Influence of chemical composition and magnetic effects on the elastic properties of fcc Fe-Mn alloys
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DOI：
10.1016/j.actamat.2010.11.013
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发表时间：
2011-02-01
期刊：
影响因子：
9.4
通讯作者：
Schneider, J. M.
中科院分区：
文献类型：
--
作者：
Gebhardt, T.;Music, D.;Schneider, J. M.
采用组合方法研究了Mn含量对面心立方Fe-Mn合金弹性性能的影响。合成了具有梯度化学成分的Fe-Mn薄膜。纳米压痕实验进行了调查的弹性性能作为锰含量的函数。随着Mn含量从近似23原子%增加到近似39原子%，平均体积模量在143 - 105 GPa之间变化。从头计算用于探索磁效应对弹性性能的影响。无序的局部磁矩的磁状态的描述产生最好的协议与实验结果，而与非磁性和反铁磁配置的体积模量被高估。磁结构的强烈影响可以根据化学键和磁体积效应的差异来理解。有人建议，由于竞争的反铁磁配置的微小的能量差，这些与“名义上的磁无序”的混合物是存在的，这实际上是很好地描述了无序的局部矩模型。这些结果表明，组合薄膜合成与随后的纳米压痕是一个合适的工具，用于调查的弹性性能的Fe-Mn合金系统的化学成分的函数，以验证理论模型。(C)2010 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The influence of the Mn content on the elastic properties of face centered cubic Fe-Mn alloys was studied using the combinatorial approach. Fe-Mn thin films with a graded chemical composition were synthesized. Nanoindentation experiments were carried out to investigate the elastic properties as a function of the Mn content. As the Mn content increases from similar to 23 to similar to 39 at.%, the average bulk modulus varies from 143 to 105 GPa. Ab initio calculations served to probe the impact of magnetic effects on the elastic properties. The magnetic state description with disordered local moments yields the best agreement with the experimental results, whereas with non-magnetic and antiferromagnetic configurations the bulk modulus is overestimated. The strong impact of the magnetic configuration may be understood based on the differences in the chemical bonding and the magnetovolume effect. It is suggested that, owing to minute energy differences of competing antiferromagnetic configurations, a mixture of these with a "notional magnetic disorder" is present, which is in fact well described by the disordered local moments model. These results show that the combinatorial thin film synthesis with subsequent nanoindentation is an appropriate tool for investigating the elastic properties of Fe-Mn alloys systematically as a function of the chemical composition, to validate theoretical models. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.