Title
Electron microscopy investigation of ternary <tex>$\gamma$</tex>-brass-type precipitation in a <tex>$Ni_{39.6}Mn_{47.5}Ti_{12.9}$</tex> alloy Electron microscopy investigation of ternary <tex>$\gamma$</tex>-brass-type precipitation in a <tex>$Ni_{39.6}Mn_{47.5}Ti_{12.9}$</tex> alloy
Author
Faculty/Department
Faculty of Sciences. Physics
Faculty of Medicine and Health Sciences
Publication type
article
Publication
London ,
Subject
Physics
Engineering sciences. Technology
Source (journal)
Philosophical magazine: A: physics of condensed matter: defects and mechanical properties. - London, 1978 - 2002
Volume/pages
79(1999) :6 , p. 1279-1294
ISSN
0141-8610
1364-2804
ISI
000080687900002
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
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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