Quasicrystalline phases and their approximants in Al—Mn—Zn alloys

Singh, A. ; Ranganathan, S. ; Bendersky, L. A. (1997) Quasicrystalline phases and their approximants in Al—Mn—Zn alloys Acta Materialia, 45 (12). pp. 5327-5336. ISSN 1359-6454

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S13596...

Related URL: http://dx.doi.org/10.1016/S1359-6454(97)00103-1


Two Al—Mn—Zn alloys in melt-spun condition have been studied by transmission electron microscopy. The Al24Mn5Zn alloy was found to be fully icosahedral, while the Al12Mn2.9Zn alloy gave rise to decagonal quasicrystal. The decagonal phase grew in clusters with an orientation relationship between the grains suggesting nucleation on an icosahedral seed. On annealing at 500-600°C, the quasicrystalline phase transformed to a body centered orthorhombic phase L (a = 1.24, b = 1.26 and c = 3.05nm) with a high density of planar defects. This phase transforms to an ordered and defect free monoclinic phase M, a superlattice structure of L (a = c = 1.77, b = 3.05nm and β = 89.1°). The L phase is shown to be a rational approximant of the icosahedral phase. The interrelationship among quasicrystalline phases and their rational approximants in Al—Mn—Zn system are highlighted.

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