作　　者： ; ; ; ; ;

机构地区： 安徽机电职业技术学院机械工程系

出　　处： 《兵器材料科学与工程》 2017年第1期80-83,共4页

摘　　要： 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 unidirectional toughness of Ti Al alloy and study effects of Nb fiber content on impact properties of Ti Al matrix composites,continuous Nb fiber-reinforced Ti Al matrix composites were prepared by using jacketed copper crucible induction melting technology and investment precision casting process. The Ti Al matrix composites were treated by vacuum annealing at 900 ℃ for 2 h. The microstructures,chemical composition of interface layer were tested by SEM and EDS.The impact properties of Ti Al-Nb composites were tested on the drop hammer impact test machine. It is shown that Nb fiber and matrix have good composite effect. There exists interactive diffusion of Ti,Al,Si and Nb elements on the interface layer. The impact properties of Ti Al matrix composites can be improved with Nb content increasing. When the volume fraction of Nb content is 20%,the impact toughness reaches the best.

关 键 词： 含量 退火处理 冲击性能

领　　域： [金属学及工艺]