小口径TA18航空钛合金管材织构测定与分析

Testing and Analysis of the Texture for the Small-Caliber Seamless Ti-3Al-2.5V Alloy Tube

摘要:

利用X射线衍射极图测量技术，对国内试制的Φ6 mm的TA18 (Ti-3Al-2.5V) 合金冷轧管材的织构类型进行研究。并测量了国外同直径的商用航空管材的织构类型和强度，与国产的管材进行了对比分析。采用管材减薄展平法解决了形状对X射线衍射强度影响无法修正的困难，实现了对管材织构的精确测定。结果表明：国产管材的织构类型与进口管材基本相似，主织构的（0002）面与管材径向夹角均为24°，晶向[100]与管轴向平行。但是织构的强度差别很大，进口管材的织构强度是国产管材的2倍以上。提高织构强度及减小离散程度是改善国产管材性能的一个重要方向。

Abstract:

The textures of homemade cold rolled Ti-3Al-2.5V alloy tubes with the diameter of 6 mm were investigated. The textures were measured by means of pole figure technique of X-ray diffraction. Meanwhile, the components and intensity of textures of the imported commercially aviational tubes with the same diameter were measured and compared to those of the homemade tubes. The difficulty of the inable revision of the shape effect on X-ray diffraction intensity was solved by the method of thinning and flattening, resulting in realizing of the accurate measurement of the tube texture. The experimental results show that the textures type of domestic and imported tubes are the similar. Main type of texture is that the included angle between the crystal orientation [0002] and radial direction of tube is 24°, meanwhile the crystal orientation [100] is parallel to the axial direction of tubes. However, the texture intensity difference between domestic and imported tubes is remarkable. The quantitative value of the latter is twice as much as that of the former. Thus inceasing of the texture intensity and reducing of dispersion degree are an important factor of improving the properties of domestic tubes.