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Tensile strain-induced softening of iron at high temperature
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.ORCID iD: 0000-0003-4341-5663
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2015 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, 16654Article in journal (Refereed) Published
Abstract [en]

In weakly ferromagnetic materials, already small changes in the atomic configuration triggered by temperature or chemistry can alter the magnetic interactions responsible for the non-random atomicspin orientation. Different magnetic states, in turn, can give rise to substantially different macroscopic properties. A classical example is iron, which exhibits a great variety of properties as one gradually removes the magnetic long-range order by raising the temperature towards its Curie point of T-C(degrees) = 1043 K. Using first-principles theory, here we demonstrate that uniaxial tensile strain can also destabilise the magnetic order in iron and eventually lead to a ferromagnetic to paramagnetic transition at temperatures far below T-C(degrees). In consequence, the intrinsic strength of the ideal single-crystal body-centred cubic iron dramatically weakens above a critical temperature of similar to 500 K. The discovered strain-induced magneto-mechanical softening provides a plausible atomic-level mechanism behind the observed drop of the measured strength of Fe whiskers around 300-500 K. Alloying additions which have the capability to partially restore the magnetic order in the strained Fe lattice, push the critical temperature for the strength-softening scenario towards the magnetic transition temperature of the undeformed lattice. This can result in a surprisingly large alloying-driven strengthening effect at high temperature as illustrated here in the case of Fe-Co alloy.

Place, publisher, year, edition, pages
Nature Publishing Group, 2015. Vol. 5, 16654
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-177935DOI: 10.1038/srep16654ISI: 000364383700001PubMedID: 26556127ScopusID: 2-s2.0-84946744723OAI: diva2:876333

QC 20151203

Available from: 2015-12-03 Created: 2015-11-30 Last updated: 2015-12-03Bibliographically approved

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Bergqvist, Lars
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