Role of nanoscale precipitates on the enhanced magnetostriction of heat-treated galfenol (Fe1-xGax) alloys.
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.
Cao
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Department of Materials Science and Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA.
Gehring
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Devreugd
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Rodriguez-Rivera
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JA
Li
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J
Viehland
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