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Iowa State University

Series

Metallurgy

Physics and Astronomy

2000

Articles 1 - 1 of 1

Full-Text Articles in Physics

The Influence Of Growth Rate On Porosity In Al-Pd-Mn Icosahedral Quasicrystals, Amy R. Ross, Ian R. Fisher, Paul C. Canfield, Thomas A. Lograsso Jan 2000

The Influence Of Growth Rate On Porosity In Al-Pd-Mn Icosahedral Quasicrystals, Amy R. Ross, Ian R. Fisher, Paul C. Canfield, Thomas A. Lograsso

Ames Laboratory Conference Papers, Posters, and Presentations

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 ...