利用金属型底浇式真空吸铸技术和添加合金元素获得TiAI基合金薄板，观察并研究薄板热处理前后的组织。结果表明，在金属型强制冷却和添加合金元素的共同作用下，利用金属型底浇式真空吸铸技术获得的TiAl基合金薄板件铸态组织细小、致密。其中Ti-47A1-5Nb-0．5Si和Ti-47A1-2W-0．5Si合金的铸态平均晶粒多在20um左右，但是，铸态组织的片层组织不均匀，且在组织内部存在较大的偏析。将试样加热到1300℃，保温5h，随炉冷却热处理后，TiAl基合金薄板的铸态组织有所长大，但是片层更加平整稳定，偏析也明显得到改善。
YE Xicong, SU Yanqing, GUO Jingjie, ZHANG Lihongz, HAO Zhijiang College of Mechanical and Material, China Three Gorges University, Yichang 443002, China ; School of Materials Science and Engineering, Harbin Institute of Technology,Harbin 150001 ,China; Medical Science College, China Three Gorges University, Yichang 443002, China ; No. 6 Institute of Project Plannina and Research of Machinery Industrv Zhen,,zhou 450007
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