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Aluminum alloys; Binary alloys; Ferromagnetic materials; Ferromagnetism; High resolution transmission electron microscopy; Manganese; Probes; Rare earths; Transmission electron microscopy, Atom-probe tomography; Elemental segregation; Ferromagnetic Heusler alloy; Heusler alloys; Massive transformations; Rare-earth-free; Solute diffusion; Solute segregation, Manganese alloys
Abstract:
Electron microscopy and atom probe tomography were combined to investigate the crystallography and chemistry of a single twin boundary (TB) in a rare-earth-free ferromagnetic MnAl Heusler alloy. The results establish a significant segregation of Mn along the twin boundaries. An enrichment of approx. ~8 at. Mn was measured along the twin boundary with a confined depletion outside the twin boundary, suggesting short range solute diffusion occurring during massive transformation. © 2018 Elsevier Ltd