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On the Crystal Structure of MnAl(r) Phase

1971; Institute of Physics; Volume: 10; Issue: 1 Linguagem: Inglês

10.1143/jjap.10.7

1347-4065

Kentaro Yoshida, Saburo Nagata,

Shape Memory Alloy Transformations

MnAl(r) phase is investigated by both X-ray powder method and transmission electron microscopy. The unit cell is concluded to have “body-centred rhombohedral” symmetry, with lattice constants of a =8.96 Å and α=89° 1' when the alloy has composition of 43 at. per cent of manganese. Single crystalline electron diffraction patterns also assure this unit cell. Surface etching patterns of the alloy, which often look like arrow feathered patterns, are also observed on transmission electron micrographs. The micro-structure can be interpreted on the basis of above cell and a model of configuration of the subgrains is proposed, boundaries of which, shafts and barbs, are indexed as {100} and {110} respectively.