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Title
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Electron microscopy investigation of ternary -brass-type precipitation in a alloy
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Author
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Abstract
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| Homogenized Ni39.6Mn47.5T12.9 material was investigated by different electron microscopy techniques. Apart from the martensite precursor distortions typical for B2 phase alloys undergoing a thermoelastic martensitic transformation upon cooling, coherent dodecahedron-shaped precipitates with sizes between 20 and 100 nm and faceted by lozenge shapes of {110}-type planes are observed. Selected-area and microdiffraction patterns reveal an overall unit cell with a size of 3 x 3 x 3 units of the bcc lattice of the matrix and a body-centred symmetry without screw axes. Finally a ternary gamma-brass-type atomic structure of space group 14(3) over bar m is suggested for these precipitates in accordance with the obtained symmetry constraints, the energy-dispersive X-ray measurements and high-resolution transmission electron microscopy images. This is the first time this type of structure is found in an alloy completely consisting of transition-metal elements. |
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Language
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English
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Source (journal)
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Philosophical magazine: A: physics of condensed matter: defects and mechanical properties. - London, 1978 - 2002
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Publication
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London
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1999
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ISSN
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0141-8610
1364-2804
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DOI
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10.1080/01418619908210361
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Volume/pages
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79
:6
(1999)
, p. 1279-1294
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ISI
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000080687900002
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Full text (Publisher's DOI)
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