快速凝固Al-Mn-Cu合金中准晶相的研究

来源期刊：中南大学学报(自然科学版)1991年第4期

论文作者：易丹青 李松瑞 邓至谦 聂祚仁 成钧

文章页码：425 - 429

关键词：铝合金; 快速凝固; 准晶相

Key words：aluminium alloy; rapid solidification; quasicrystalline phase

摘    要：采用X射线衍射、透射电镜(TEM)和差热分析(DTA)等手段在快速凝固A₆₆Mn₁₄Cu₂₀合金中发现一个二十面体相。这个相的选区电子衍射花样显示出准晶体结构的五次对称性。X射线能谱分析结果表明它是一个成分为Al₁₁Mn₃Cu₆的三元相。差热分析结果反映出这个准晶相有很高的热稳定性。以20K/min的速度加热时,这个相的晶化峰值温度为818K,其转变激活能约为405.7kJ/mol。

Abstract: An icosahedral phase in a rapidly solidifidd Al₆₆ Mn₁₄ Cu₂₀ alloy is identified by means of X-ray diffraction (XRD), transmission microscope (TEM) and differential thermal analysis (DTA)methods. The selected area diffraction patterns from the phase show a fivefold symmetry of a qua-sierystalline structure. The energy dispersive X-ray spectra (EDXS) for the phase indicate that it is aternary of composition Al₁₁ Mn₃ Cu₆. The results of DTA reveal that it has high thermal stability.Its crystalization peak temperature (at heating rate 20 K/min) is 818 K, and the activation energy of the transformation is about 405. 7 kJ/mol.