静高压下Al80Mn14Si6合金准晶相形成的研究

 本文首次研究了Al₈₀Mn₁₄Si₆合金在静高压下准晶相得形成。利用静高压熔态淬火方法，在压力2.8和3.1 GPa下得到淬火的Al-Mn-Si样品。电子和X射线衍射实验表明，高压淬火样品中含有准晶二十面体相和非晶相。X射线衍射实验还表明，高压淬火样品经350 ℃退火一小时基本上没有发生变化；而经过500 ℃退火一小时后，准晶相晶化为α-Al₇₃Si₁₀Mn₁₇相。另外，电子衍射实验表明，高压淬火后样品中还存在其它中间亚稳相。本文还讨论了静高压熔态淬火方法的适用性。

A STUDY ON THE FORMATION OF QUASI-CRYSTAL Al_(80)Mn(14)Si_6 UNDER HIGH STATIC PRESSURE

By using the method of quenching in fusing state under high static pressure (MQFSHP), the samples of Al₈₀Mn₁₄Si₆ alloy rapidly quenched were gained under pressure of 2.8 and 3.1 GPa respectively. The quenched samples were examined by X-ray diffraction and electron diffraction. Results show that they contain icosahedra phase, non-crystal, intermediate metastable phase. After the quenched samples were heated to 350 ℃ maintained for 1 h, there occurred no detectable crystallization of Ⅰ-phase in them, but for the case of 500 ℃/h, the samples crystallized completely into a stable α-Al₇₃Si₁₀Mn₁₇. In this paper, the applicability of MQFSHP to the quasi-crystal formation has also been discussed.