Structural modifications in a Mn54Al43C3 melt-spun alloy induced by mechanical milling and subsequent annealing investigated by atom probe tomography

•A Mn54Al43C3 alloy was studied by atom probe tomography.•Milling the powder for 10h leads to nanostructuration and partial oxidation.•Annealing the milled powder leads to enrichment in Al of the oxidised regions.•Annealing also leads to the formation of a nanostructured β-Mn3Al2 phase. The structur...

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Bibliographic Details
Published in:Journal of alloys and compounds 2013-12, Vol.581, p.86-90
Main Authors: Le Breton, J.M., Bran, J., Folcke, E., Lucis, M., Lardé, R., Jean, M., Shield, J.E.
Format: Article
Language:English
Subjects:
Annealing
Applied sciences
Atomic structure
Condensed matter: structure, mechanical and thermal properties
Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
Cross-disciplinary physics: materials science
rheology
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations
pressure effects
Diffraction
Exact sciences and technology
Heat treatment
Materials science
Mechanical alloying and milling
Mechanical milling
Melt spinning
Metals. Metallurgy
Microalloying
Nanostructure
Nanostructured intermetallics
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase transformations
Physics
Powder metallurgy. Composite materials
Production techniques
Structure of solids and liquids
crystallography
Technology
Tomography
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Summary:•A Mn54Al43C3 alloy was studied by atom probe tomography.•Milling the powder for 10h leads to nanostructuration and partial oxidation.•Annealing the milled powder leads to enrichment in Al of the oxidised regions.•Annealing also leads to the formation of a nanostructured β-Mn3Al2 phase. The structural changes upon milling and subsequent annealing of a Mn54Al43C3 alloy containing the intermetallic tetragonal L10 MnAl phase (τ phase) as the major phase were investigated by X-ray diffraction and atom probe tomography. The analyses show that milling the starting powder for 10h leads to the nanostructuration of the sample. The milled sample is partly oxidised and contains both non oxidised Mn60±5Al40±5 regions and oxidised regions. Annealing the powder for 1h at 500°C leads to enrichment in Al of the oxidised regions, and to the phase transformation of the non-oxidised regions into a nanostructured β-Mn-like phase with a composition close to Mn3Al2.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.07.002