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Transformation‐Induced Magnetoelasticity in FeGa Alloys
Author(s) -
Steiner Jacob,
Pokharel Sabine,
Lisfi Abdellah,
Fleischer Jason,
Wyrough Paul,
Salamanca-Riba Lourdes,
Cumings John,
Wuttig Manfred R.
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201900399
Subject(s) - magnetostriction , materials science , diffusionless transformation , transformation (genetics) , thermoelastic damping , shape memory alloy , plasticity , phase (matter) , magnetic shape memory alloy , alloy , nanostructure , martensite , condensed matter physics , metallurgy , magnetic domain , composite material , thermodynamics , magnetic field , microstructure , nanotechnology , magnetization , physics , chemistry , biochemistry , quantum mechanics , thermal , gene
Global or local phase transformations are commonly used to create or improve useful properties of materials: the functionality of shape memory alloys is enabled by a global thermoelastic transformation. Transformation‐induced plasticity (TRIP) steels and the creation of transformation‐toughened ceramics are examples of materials innovations through local martensitic phase transformations. This research is undertaken to elucidate the nature of the large magnetostriction in FeGa alloys. An investigation of the evolution of the alloy's nanostructure in the varying magnetic fields of the objective lens of an electron microscope reveals the mechanism leading to the large magnetostriction; it is caused by a local martensitic transformation of the DO 3 nanoprecipitates to a 6M phase, leading to transformation‐enhanced magnetoelasticity. The analysis of macroscopic elastic, magnetostriction, and magnetic torque data corroborates this finding.