Improving the Al₆Li₃Cu quasicrystals by annealing treatments

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• 作者：Donnadieu ; P. ; Wang ; K. ; Degand ; C. ; Garoche ; P.
• 刊名：Journal of Non-Crystalline Solids
• 出版年：1995
• 出版时间：April, 1995
• 年：1995
• 卷：183
• 期：1-2
• 页码：100-108
• 全文大小：1.35 M

文摘

The Al₆Li₃Cu (T2) phase is known as a very imperfect icosahedral quasicrystal. Up to now, the cast phase has not been annealed because of the difficulties in preventing lithium loss during annealing. By using a dedicated device described in the present paper, it has been possible to carry out thermal treatments at temperatures higher than 500°C. The procedure involves two steps: the former aims at eliminating the eutectic phases; the latter is a long annealing at 575°C that improves the quasicrystal structure. The quality of the annealed quasicrystals was checked by transmission electron microscopy investigations. A comparison of several specimens of annealed Al₆Li₃Cu (T2) phase with the cast material is reported.