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The Influence of Growth Rate on Porosity in Al-Pd-Mn Icosahedral Quasicrystals.

Published online by Cambridge University Press:  17 March 2011

Amy R. Ross ,
Ian R. Fisher ,
Paul C. Canfield  and
Thomas A. Lograsso
Amy R. Ross
Affiliation:
Ames Laboratory and, Materials Science and Engineering, Iowa State University, Ames, IA 50011-3020, USA
Ian R. Fisher
Affiliation:
Stanford University, Stanford, Ca 94305, USA
Paul C. Canfield
Affiliation:
Ames Laboratory and, Materials Science and Engineering, Iowa State University, Ames, IA 50011-3020, USA Department of Physics and Astronomy, and Materials Science and Engineering, Iowa State University, Ames, IA 50011-3020, USA
Thomas A. Lograsso
Affiliation:
Ames Laboratory and, Materials Science and Engineering, Iowa State University, Ames, IA 50011-3020, USA Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011-3020, USA
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Abstract

Growth experiments have been carried out to characterize the occurrence and development of porosity in Bridgman and flux grown Al-Pd-Mn icosahedral quasicrystals. The porosity level has been observed to fluctuate between values of 0.0 and 3.75 percent along the length of Bridgman single crystals implying that the development of porosity is affected by the local growth conditions. Experiments were conducted to evaluate the influence of the rate of solidification on the occurrence of porosity. Alloys were solidified with different growth rates, 1mm/hr and >10 mm/hr, using the Bridgman configuration and at different cooling rates, ranging from 0.29°C/hr to 10°C/hr, using the flux growth method. Porosity levels were analyzed via optical image analysis. These experiments indicate that porosity percentages are greatly influenced by cooling rates and crystal size.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K1.5
Copyright
Copyright © Materials Research Society 2001

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References

References:

1. , Beeli, Ph.D Thesis, ETH Zürich (Switzerland), 1992 Google Scholar
2. Beeli, C. and Nissen, H.-U.., Phil. Mag. B., 68 (4), 487 (1993)Google Scholar
3. Beeli, C., Gödecke, T., and Lück, R., Proceedings of the 6th International Conference on Quasicrystals, edited by. Takeuchi, S. and Fujiwara, T. (World Scientific, Singapore, 1998), pp. 421–424 Google Scholar
4. Beeli, C., Gödecke, T., and Lück, R., Phil. Mag. Let., 78 (5), 339 (1998)Google Scholar
5. Mancini, L., Janot, C., Loreto, L., Farinato, R., Gastaldi, J., and Baruchel, J., Phil. Mag. Let., 78 (2), 159 (1998)Google Scholar
6. Janot, C., Loreto, L., Farinato, R., Mancini, L., Baruchel, J., Gastaldi, J., Quasicrystals, edited by Dubois, J.-M., Thiel, P. A., Tsai, A.-P., Urban, K. (Mater. Res. Soc. Proc. 553, Pittsburgh, PA, 1999) pp 55–66 Google Scholar
7. Ross, A.R., Wiener, T.A., Fisher, I.R., Canfield, P.C., and Lograsso, T.A., Mat. Sci Eng. A, 294, p53 (2000)Google Scholar
8. Fisher, I.R., Kramer, M.J., Wiener, T.A., Islam, Z., Ross, A.R., Lograsso, T.A., Krachker, A., Goldman, A.I., Canfield, P.C., Phil. Mag. B. 79 (10), 1673 (1999).Google Scholar
9. Ross, A.R., unpublished results, 1999 – 2000 Google Scholar
10. Fisher, I.R., (private communications)Google Scholar
11. Kluge, F., Cai, T-H., Grushko, B., Thiel, P.A., Ebert, Ph., and Urban, K., in preparationGoogle Scholar