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利用真空电磁悬浮熔炼炉对铝热法还原攀枝花酸溶性钛渣所得的粗TiAl基合金进行精炼,研究了精炼前后合金物相组成、合金元素在微区中的分布、组织结构和杂质含量的变化。发现在精炼参数为熔炼电流60A,保温时间5min,冷却速率4A/min时,精炼后的合金层片状组织和裂纹减少,晶粒尺寸减小。Si、Fe元素置换Al元素形成置换固溶相,存在于TiAl、TiAl_2等相中,形成了Fe_2AlTi、Si_2Ti、Al_2FeSi、AlFe、FeTiSi等物相,接近于Ti-Al二元合金的双相组织。合金中夹杂物的含量减少了45%,去除了合金中的粒径>5μm的大颗粒夹杂物。
In the vacuum electromagnetic suspension smelting furnace, the crude TiAl-based alloy obtained by aluminothermic reduction of acid-soluble titanium slag from Panzhihua was refined. The changes of the phase composition, distribution of alloying elements in the micro-zone, microstructure and impurity content before and after refining . It was found that the refining temperature of 60A, holding time of 5min and cooling rate of 4A / min decreased the lamellar structure and cracks of the alloy layer and decreased the grain size. Si and Fe elements replace the Al element to form a substitutional solid solution phase, which exists in the phases of TiAl and TiAl_2. The phases of Fe 2 AlTi, Si 2 Ti, Al 2 FeSi, AlFe and FeTiSi are formed, which are close to that of Ti-Al binary alloy. The content of inclusions in the alloy is reduced by 45%, removing large inclusions> 5μm in the alloy.