Tetragonal fcc-Fe induced by κ -carbide precipitates: Atomic scale insights from correlative electron microscopy, atom probe tomography, and density functional theory
2018; American Physical Society; Volume: 2; Issue: 2 Linguagem: Inglês
10.1103/physrevmaterials.2.023804
ISSN2476-0455
AutoresChristian H. Liebscher, Mengji Yao, Poulumi Dey, Marta Lipińska-Chwałek, Benjamin Berkels, Baptiste Gault, Tilmann Hickel, Michael Herbig, Joachim Mayer, Jörg Neugebauer, Dierk Raabe, Gerhard Dehm, Christina Scheu,
Tópico(s)Metal and Thin Film Mechanics
ResumoCorrelative scanning transmission electron microscopy, atom probe tomography, and density functional theory calculations resolve the correlation between elastic strain fields and local impurity concentrations on the atomic scale. The correlative approach is applied to coherent interfaces in a $\ensuremath{\kappa}$-carbide strengthened low-density steel and establishes a tetragonal distortion of fcc-Fe. An interfacial roughness of $\ensuremath{\sim}1\phantom{\rule{4pt}{0ex}}\mathrm{nm}$ and a localized carbon concentration gradient extending over $\ensuremath{\sim}2--3\phantom{\rule{4pt}{0ex}}\mathrm{nm}$ is revealed, which originates from the mechano-chemical coupling between local strain and composition.
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