Abstract
Quasi–crystals of Al65Cu20RU15 alloy are known to be an icosahedral— phase (I— phase) of the F–type. This state has been confirmed to be stable near 1100 K, but perhaps not at temperatures higher than around 1300 K. In this paper we report high temperature behavior of this alloy. We have found that the stable I-phase would decompose into three or four phases at 1420 K, one of which is an I–phase having a different composition. We denote the lower temperature I–phase, I–phase(L), and this high temperature one, I–phase(H).5N Al and Cu and 3N Ru were arc-melted in Ar. The nominal composition of the alloy was 65A1, 20Cu and 15Ru. In order to obtain homogeneous materials, the ingot was annealed at 1020 K for 100 hours. The X-ray powder diffraction pattern confirmed that the heat-treated ingot was only I-phase(L). This is the starting material in this study. DTA and EPMA analysis, and SEM and TEM observations were carried out in order to investigate subsequence thermal reaction. Experimental results with brief discussion are as follows.
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