Abstract
Rapidly solidified Al78Mn20Ge2 alloy exhibits a curious structural feature; this corresponds to the simultaneous occurrence of almost all the quasicrystalline phases, e.g., primitive and face-centered icosahedral phase, rational approximant, and a new metastable cubic phase. The cubic crystalline phase shows yet another type of recently observed twin relation which effectively produces an icosahedral symmetry, a feature that has so far been specific to alloy systems Al–Mn–Si and Al–Mn–Fe–Si only. The diffraction evidences obtained in the present investigation reveal that the orientation of the structural subunit, which is a MacKay icosahedron, remains invariant across the various interphase boundaries. These results elucidate clearly the structural interrelationship among the various phases.
Similar content being viewed by others
References
D. Shechtmann, I. Blech, D. Gratias, and J. W. Cahn, Phys. Rev. Lett. 53, 1951 (1984).
S. J. Poon, A. J. Drehman, and K. R. Lawless, Phys. Rev. Lett. 55, 2324 (1985).
H. S. Chen and A. Inoue, Scripta Metall. 21, 527 (1987).
L. A. Bendersky, Phys. Rev. Lett. 55, 1461 (1985).
K. Chattopadhyay, S. Lele, N. Thangaraj, and S. Ranganathan, Acta Metall. 35, 727 (1987).
A. P. Tsai, A. Inoue, and T. Masumoto, Jpn. J. Appl. Phys. 26, L1505 (1987).
S. Ebalard and F. Spaepen, J. Mater. Res. 4, 39 (1989).
K. Chattopadhyay and N. K. Mukhopadhyay, Mater. Sci. Forum 22–24, 639 (1987).
C. H. Chen and H. S. Chen, Phys. Rev. B 33, 2814 (1986).
D. S. Rokhsar, N. D. Mermin, and D. C. Wright, Phys. Rev. B 35, 5487 (1987).
N. P. Lalla, R. S. Tiwari, and O. N. Srivastava, Philos. Mag. B 63, 629 (1991).
R. J. Schaefer and L. A. Bendersky, Scripta Metall. 20, 745 (1986).
D. C. Koskenmaki, H. S. Chen, and K. V. Rao, Phys. Rev. B 33, 5326 (1986).
L. A. Bendersky, J. W. Cahn, and D. Gratias, Philos. Mag. B 60, 837 (1989).
N. K. Mukhopadhyay, G. N. Subbanna, K. Chattopadhyay, and S. Ranganathan, Proc. IV Asia-Pacific Conference on Electron Microscopy, Bangkok, 187 (1988).
A. P. Tsai, A. Inoue, Y. Yokoyama, and T. Masumoto, Philos. Mag. Lett. 61, 9 (1990).
M. Cooper and K. Robinson, Acta Cryst. 20, 614 (1966).
P. Villars and L. D. Calvert, Pearson’s Handbook of Crystal-lographic Data for Intermetallic Phases (American Society for Metals, Metal Park, OH, 1985).
F. H. Li, G. Z. Pan, S. Z. Tao, M. J. Hui, Z. H. Mai, X. S. Chen, and L. Y. Cai, Philos. Mag. B 59, 535 (1989).
K. K. Fung and Y. Q. Zhow, Philos. Mag. B 54, L27 (1986).
N. K. Mukhopadhya, K. N. Ishihara, S. Ranganathan, and K. Chattopadhyay, Acta Metall. (submitted, 1990).
J. Devaud-Rzepski, A. Quivy, Y. Calvayrae, M. Cornier-Quiquandon, and D. Gratias, Philos. Mag. B 60, 855 (1989).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Lalla, N.P., Tiwari, R.S. & Srivastava, O.N. Coherent orientation relationship among various quasicrystalline and crystalline phases in rapidly solidified Al78Mn20Ge2 alloy. Journal of Materials Research 7, 53–61 (1992). https://doi.org/10.1557/JMR.1992.0053
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1557/JMR.1992.0053