论文部分内容阅读
为改善TiAl基合金的单向韧性,研究Nb纤维含量对TiAl基复合材料冲击性能的影响,采用熔模精密铸造和真空水冷铜坩埚感应熔炼炉离心浇注工艺制备连续Nb纤维增韧TiAl-Nb复合材料,并对其进行950℃×2h真空退火处理。用SEM、EDS观察复合材料界面形貌与成分,用落锤冲击试验机测试复合材料的冲击性能。研究结果表明:Nb纤维与TiAl基体材料复合效果良好,Ti、Al、Si、Nb元素在界面层发生交互式扩散;随Nb含量增加复合材料的冲击性能改善,当Nb体积分数为20%时,冲击韧性最好。
In order to improve the one-way toughness of TiAl-based alloy and study the impact of Nb fiber content on the impact properties of TiAl-based composites, continuous Nb fiber toughened TiAl-Nb composite was prepared by using investment casting and vacuum water-cooled copper crucible induction melting furnace centrifugal casting Material, and its 950 ℃ × 2h vacuum annealing. The morphology and composition of the interface of the composites were observed by SEM and EDS, and the impact properties of the composites were tested by drop weight impact tester. The results show that the composite effect of Nb fiber and TiAl matrix material is good, Ti, Al, Si and Nb elements diffuse interactively at the interfacial layer. With the increase of Nb content, the impact properties of the composites are improved. When the volume fraction of Nb is 20% Impact toughness best.