纳米级析出相对热处理的盖芬合金（Fe1-xGax）磁致伸缩增强的作用。

Role of nanoscale precipitates on the enhanced magnetostriction of heat-treated galfenol (Fe1-xGax) alloys.

作者信息

Cao H, Gehring P M, Devreugd C P, Rodriguez-Rivera J A, Li J, Viehland D

机构信息

Department of Materials Science and Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA.

出版信息

Phys Rev Lett. 2009 Mar 27;102(12):127201. doi: 10.1103/PhysRevLett.102.127201. Epub 2009 Mar 25.

DOI:10.1103/PhysRevLett.102.127201

PMID:19392316

Abstract

We report neutron diffuse scattering measurements on highly magnetostrictive Fe1-xGax alloys (0.14<x<0.20) with different thermal treatments. This diffuse scattering scales with magnetostriction and exhibits asymmetric peaks at the (100) and (300) reciprocal lattice positions that are consistent with the coexistence of short-range ordered, coherent nanometer-scale precipitates embedded in a long-range ordered, body-centered cubic matrix. A large peak splitting is observed at (300) for x=0.19, which indicates that the nanoprecipitates are not cubic and have a large elastic strain. This implies a structural origin for the enhanced magnetostriction.

摘要

我们报告了对经过不同热处理的高磁致伸缩Fe1-xGax合金（0.14<x<0.20）进行的中子漫散射测量。这种漫散射与磁致伸缩成比例，并在（100）和（300）倒易晶格位置呈现不对称峰，这与嵌入长程有序体心立方基体中的短程有序、相干纳米级析出物的共存相一致。对于x=0.19，在（300）处观察到一个大的峰分裂，这表明纳米析出物不是立方的，并且具有大的弹性应变。这意味着磁致伸缩增强的结构起源。