Non-isothermal oxidation and ignition prediction of titanium-chromium alloys
The non-isothermal oxidation behavior and oxide scale microstructure of titanium-chromium alloys (0≤w≤25%) were studied from room temperature to 1723K by thermogravimetric analysis (TGA),X-ray diffraction (XRD) and scanning electron microscopy (SEM),et al.The influencing mechanism of chromium on the oxidation resistance of titanium-chromium alloys was discussed.The results showed that the oxidation resistance of the alloys decreases below a critical chromium content wC and increases above wC,which is within 10-15%,above 1000K,the oxidation kinetics obeys parabolic rule and titanium dominates the oxidation process,after oxidation,the oxygen-diffusing layer is present in the alloy matrix,the oxide scale is mainly composed of rutile whose internal layer is rich in chromium,and chromium oxides separated out from TiO2 near the alloy-oxide interface improve the oxidation resistance,the oxidation of the alloys is controlled by the inward diffusion of O2-and outward diffusion of Tii4+ and Cri3+,and Tii4+ has priority over Cri3+ to diffuse outwards,which leads to the enrichment of chromium near the alloy-oxide interface.Ignition of metals and alloys is a fast non-isothermal oxidation process and the oxidation mechanism of titanium-chromium alloys during ignition is predicted by this study.
Titanium-chromium alloys non-isothermal oxidation thermogravimetric analysis (TGA) oxide scale microstructure ignition
Mi Guangbao Huang Xiusong Li Peijie Cao Jingxia Huang Xu Cao Chunxiao
National Center of Novel Materials for International Research, Tsinghua University, Beijing 100084, National Center of Novel Materials for International Research, Tsinghua University, Beijing 100084, Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys, Beijing Institute of
国际会议
上海
英文
7-7
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）