航空学报 > 2005, Vol. 26 Issue (1): 103-106

Nb-10Si合金室温断裂韧性研究

李伟, 杨海波, 单爱党, 吴建生   

  1. 上海交通大学 材料科学与工程学院, 上海 200030
  • 收稿日期:2003-11-27 修回日期:2004-03-20 出版日期:2005-02-25 发布日期:2005-02-25

Study on the Fracture Toughness of Nb-10Si Alloys

LI Wei, YANG Hai-bo, SHAN Ai-dang, WU Jian-sheng   

  1. School of Material Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China
  • Received:2003-11-27 Revised:2004-03-20 Online:2005-02-25 Published:2005-02-25

摘要: 利用真空电弧熔炼制备了处于亚共晶区的Nb-10Si-xMo(x=5,15)复合材料,采用扫描电子显微镜(SEM)和X射线衍射(XRD)分析了在1200℃退火100h后复合材料的微观组织形貌、相组成和断口形貌,并测定了Nb-10Si-Mo复合材料的显微硬度。用单边切口悬臂梁法(SENB)研究了加入合金元素后复合材料室温韧性的变化。深入分析了合金元素对材料韧性相变形行为和复合材料室温断裂韧性的影响。

关键词: Nb/Nb5Si3复合材料, 断裂韧性, 单边切口悬臂梁(SENB), 维氏硬度, 亚稳相

Abstract: Nb-10Si and Nb-10Si-xMo(x=5,15) composites at hypoeutectic compositions are prepared by arc-melting, followed by heat treatment at 1200℃ for 100 hours. The microstructures, compositions and the fracture surface of annealed sample are investigated using scanning electron microscopy (SEM) and X-ray energy disperse spectrum (EDS), as well as X-ray diffraction (XRD). The microhardness of Nb-10Si-Mo is determined. Single edge notched bending (SENB) test is used to measure the fracture toughness of Nb-10Si-xMo(x=0,5,15). The effect of Mo addition on the deformability of ductile phase in Nb/Nb5Si3 and the fracture toughness of Nb/Nb5Si3 in situ composites is further studied.

Key words: Nb/Nb5Si3 composites, fracture toughness, single edge notched bending (SENB), Vickers hardness, metastable phase

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