Abstract
Rapid pressurization of liquid metals has been shown both theoretically and experimentally to yield appreciable undercooling1,2. With the aim of demonstrating metastable phase formation by this technique, we have now performed a rapid pressurization experiment on an Al80Mn20 alloy and studied the product thus obtained. This was found to contain the metastable icosahedral phase first reported by Shechtman et al.3 and studied extensively by many authors4–9. (Pauling8 has recently suggested that the same phase can also be indexed to a large cubic cell. However, our conclusions on the formation of metastable phases will be unaffected by the outcome of this controversy.) We have also found that a new metastable cubic ferromagnetic phase of composition Al3Mn coexists along with the icosahedral phase. The rapid pressurization technique shows promise of becoming a method for obtaining rapidly solidified microstructures and phases in large volumes.
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References
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Sekhar, J., Rajasekharan, T. Rapid pressurization experiments on a liquid Al–Mn alloy. Nature 320, 153–155 (1986). https://doi.org/10.1038/320153a0
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DOI: https://doi.org/10.1038/320153a0
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