A Study on the Formation and the Stability of Al6Mn Quasicrystal under High Static Pressure
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摘要: 静高压（4.5 GPa）下Al6Mn合金熔态淬火（冷却速度约为102 ℃/s），得到Al6Mn合金的高压淬火样品。X射线分析表明：Al6Mn合金的高压淬火样品中含有准晶二十面体相、Al6Mn相及Al的面心立方相；与常压结果相比，高压淬火方法的冷却速率可比常压的低约3个数量级的条件下产生准晶二十面体相。其晶化温度与急冷甩带的相近。对静高压（2.5 GPa）下Al6Mn准晶条带样品的晶化过程进行了研究。X射线分析表明：静高压下Al6Mn准晶条带样品的晶化过程中，出现了一种新的未知亚稳相准晶向晶体转化中的一种中间过渡态，具有类T相形式；与常压结果比较，高压下准晶相晶化温度提高。Abstract: In this paper, a new method of quenching at fuse state (1 300 ℃) under high static pressure (4.5 GPa) hase been set up to prepare the quasicrystal icosahedral phase of the Al6Mn alloy, the crystallization temperature of which is close to the one of rapid cooling ribbon sample, and the cooling rate during the quenching is of about 102 ℃/s. A new intermediate metastable phase (a T-phase-like) occures during the crystallization process of Ⅰ-phase under high static pressure (2.5 GPa) for the rapid cooling ribbon of Al6Mn. The high static pressure increases its crystallization temperature and enhances the stability of the intermediate metastable phase.
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Key words:
- quasicrystal icosahedral /
- high static pressure /
- quenching at fuse state /
- crystallization /
- intermediate phase /
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