Abstract: In this paper, the phase and element distribution of TNW700 titanium alloys were analyzed by means of EPMA (Electron probe microanalysis), SEM, EDS, etc. The phase transition and surface oxides of the alloy during heating process and thermal exposure were analyzed by using in-situ X-ray diffraction (XRD) technique. The result showed that the TNW700 titanium alloy is a high aluminum-equivalent alloy whose creep durability can be improved by the synergistic effect of precipitation strengthening of silicon and α2 phase. During the heating process, zirconium begins to dissolve into titanium forming solid solution at 600 ℃, and reaches saturation at 900 ℃ saturated. TiC and Ti3Al phases increase with the rising temperature exceeding 880 ℃. 700 ℃thermal exposure test confirmed that the generated surface oxides are mainly Ti6O and Ti3O with a low increment rate and only a little TiO2 and Al2O3 generated. It seems that the TNW700 alloy exhibits a satisfactory short-term resistance to high-temperature surface oxidation.
姚罡, 付明杰. TNW700高温钛合金热过程中的相组织变化分析[J]. 材料导报, 2018, 32(20): 3584-3589.
YAO Gang, FU Mingjie. Analysis of Phase Change in the Thermal Process of TNW700 High-temperature Titanium Alloy. Materials Reports, 2018, 32(20): 3584-3589.
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2018, Vol. 32 
