摘要
研究Ti-25V-15Cr-0.2Si和Ti-25V-15Cr-2Al-0.2Si两种阻燃钛合金在550℃热暴露不同时间后的力学性能,并应用光学显微镜、X射线衍射、透射电镜对合金组织进行分析。结果表明,Al元素使Ti40阻燃钛合金在550℃的热稳定性能显著降低;对相的分析表明,Al元素可促进合金中Ti5Si3和α相的形成。在550℃热暴露200 h条件下,出现明显的TiCr2有序相。降低组织的稳定性及使合金在热暴露过程中生成过多的第二相是Al元素降低合金热稳定性能的主要原因。
The mechanical properties of Ti-25V-15Cr-0.2Si and Ti-25V-15Cr-2Al-0.2Si after thermal exposure at 550℃ for different times were studied, and their microstructures were analyzed by OM, XRD and TEM. The results show that the thermal stability of the alloy decreases obviously with the addition of AI element during thermal exposure process. The analysis results of microstructures indicate that the addition of AI improves the precipitation of TisSi3 and α phase, and after 550 ℃ thermal exposed for 200 h there formed TiCr2 ordered phases in the alloy with the addition of AI element. The decrease of structure stability and much more precipitated phases are the main reasons of the effect of alloying element AI on the thermal stability.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2007年第9期1475-1480,共6页
The Chinese Journal of Nonferrous Metals
基金
国家重点民口配套资助项目(MKPT-01-101(ZD))
国防"973"资助项目(51333)
关键词
TI40阻燃钛合金
热暴露
析出物
力学性能
Ti40 bum-resistant titanium alloy
thermal exposure
precipitated phases
mechanical property
