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Coherent orientation relationship between an icosahedral phase and a cubic α phase in melt-spun Al-Si-Mn

1986; American Physical Society; Volume: 33; Issue: 8 Linguagem: Inglês

10.1103/physrevb.33.5328

1095-3795

David C. Koskenmaki, H. S. Chen, K.V. Rao,

Microstructure and mechanical properties

We report what we believe to be the first observation of definite coherent directional relationship between a cubic \ensuremath{\alpha} phase and an icosahedral phase in rapidly quenched Al-Si-Mn. Electron-microscopic studies reveal that the set of three cubic orthogonal [001]-type directions are parallel, respectively, to three icosahedral twofold axes, and all cubic [111] directions are parallel to threefold icosahedral axes, while the fivefold icosahedral directions are very close to [530]-type cubic directions. Structural models of the quasicrystal as a disordered \ensuremath{\alpha} phase are consistent with the present results.