本文借助于热分析、金相、X射线和电子探针分析研究了Al-Mg-Ce体系富Al区三元金属间化合物与液相限。发现固相中生成的金属间化合物X可在颇大范围内形成固溶体;Al-Mg_5Al_8-CeAl_4赝三元体系仍属低共熔型体系。有对应于α-Al,Mg_5Al_8和CeAl_4的三个液相面,三条二次结晶线,一个三元低共熔点,组成约为12.6wt-％Ce,26.0wt-％Mg;温度446℃。
The liquidus of the Al-rich corner in Al-Mg-Ce phase diagram and the intermetallic compound, if any, formed in this region have been studied by themal, EMPA, chemical analysis, metallography and X-ray examination. An intermetallic compound in the solid phase was observed to form solid solution with rather extensive range. The pseudo-ternary system Al-Mg_5Al_8-CeAl_4 is of the ternary eutectie type. Three surfaces corresponding to primary crystallization of α-Al, Mg_5Al_8 and CeAl_4 respectively, three univariant curves associated with secondary crystallization and a ternary eutectic with composition about 12.6 wt-%C e and 26.0wt-%Mg at 446℃ were detected.
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