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Tensile strain-induced softening of iron at high temperature
KTH Royal Inst Technol, Dept Mat Sci & Engn, S-10044 Stockholm, Sweden..
KTH Royal Inst Technol, Dept Mat Sci & Engn, S-10044 Stockholm, Sweden..
Budapest Univ Technol & Econ, Dept Theoret Phys, HU-1111 Budapest, Hungary..
KTH Royal Inst Technol, Dept Mat & Nano Phys, SE-16440 Kista, Sweden..
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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
2015. Vol. 5, 16654
National Category
Other Natural Sciences Physical Sciences
URN: urn:nbn:se:uu:diva-268399DOI: 10.1038/srep16654ISI: 000364383700001PubMedID: 26556127OAI: diva2:878510
Swedish Research CouncilSwedish Research Council FormasEU, European Research CouncilSwedish e‐Science Research CenterGöran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of TechnologyEU, European Research CouncilEU, European Research Council, TAMOP 4.2.4.A/2-11-1-2012-0001
Available from: 2015-12-09 Created: 2015-12-04 Last updated: 2015-12-09Bibliographically approved

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