Role of Nanoscale Precipitates on the Enhanced Magnetostriction of Heat-Treated Galfenol (Fe1-xGax) Alloys

被引：102
作者：
Cao, H. [1 ]
Gehring, P. M. [2 ]
Devreugd, C. P. [1 ]
Rodriguez-Rivera, J. A. [3 ]
Li, J. [1 ]
Viehland, D. [1 ]
机构：
[1] Virginia Tech, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
[2] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA
[3] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 12期
关键词：
FE-GA; MAGNETOELASTICITY;
D O I：
10.1103/PhysRevLett.102.127201
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页数：4
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