本文借助于热分析、金相和X射线结构分析,研究了Al-Mg-La体系富Al区的液相限。所有样品均经过化学分析以确定其组成。发现:Al-Mg_5Al_6-LaAl_4赝三元体系属低共熔型;有对应于α-Al,Mg_5Al_6和LaAl_4的三个液相面;三条二次结晶线;一个三元低共熔点,其组成为11.3％La,62.9％Al和25.8wt-％Mg,温度445℃。
The liquidus of the Al-rich corner in the phase diagram of Al-Mg-La system has been investigated by means of thermal, metallographic and X-ray diffraction techniques. The composition of all samples was determined accurately by chemical analysis. It was found that the pseudo-ternary system Al-Mg_5Al_8-LaAl_4 is of the ternary eutectic type. There are three surfaces corresponding to the primary crystallization of a-Al, Mg_5Al_8 and LaAl_4 respectively, and three univariant lines related to the secondary crystallization. The temperature of the ternary eutectic, composed of 11.3 wt-% La, 62.9 wt-% Al and 25.8 wt-% Mg, was determined to be 445℃.
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