Ti-3Al-2.5V钛合金管织构演变规律研究（英文）

发布时间：2018-06-05 08:27

本文选题：Ti-Al-.V管 + 织构演变　；参考：《稀有金属材料与工程》2017年11期

【摘要】：各向异性是钛合金管的一种重要性能,宏观上通常用收缩应变比(CSR)进行描述,而在微观上则可以通过织构演变分析其变化规律。通过EBSD方法研究了Ti-3Al-2.5V管轴向拉伸过程中的织构演变,揭示了CSR与织构演变的内在联系。结果表明,随着轴向塑性应变的增加,钛合金管α相晶体的基轴从开始变形时的沿径向分布逐渐朝着周向方向偏转,然后稳定在与径向成45°左右的位置。另外,β相在轴向拉伸过程中也表现出了明显的择优取向。正是因为织构的变化导致了CSR先迅速减小,然后缓慢减小,最后趋于稳定的变化规律。考虑到α相密排六方晶胞的基轴取向在轴向上的分量,改进了简化的CSR-f(织构量化参数)模型。与实验结果的对比表明,改进模型与实验值符合得较好。
[Abstract]:Anisotropy is an important property of titanium alloy tubes, which is usually described by shrinkage strain ratio (CSR) macroscopically. The texture evolution of Ti-3Al-2.5V tube during axial stretching was studied by EBSD method, and the relationship between CSR and texture evolution was revealed. The results show that, with the increase of axial plastic strain, the base axis of 伪 phase crystal of titanium alloy tube gradually deflects to the circumferential direction from the beginning of deformation, and then stabilizes at the position of about 45 掳. In addition, the 尾 -phase also showed an obvious preferred orientation during the axial tensile process. It is precisely because of the texture change that the CSR decreases rapidly, then slowly, and finally tends to stabilize. The simplified CSR-f (texture quantization parameter) model is improved considering the axial component of the basic axis orientation of the 伪 -phase dense hexagonal unit cell. The comparison with the experimental results shows that the improved model is in good agreement with the experimental results.
【作者单位】：西北工业大学凝固技术国家重点实验室;
【基金】：Key Program Project of the Joint Fund of Astronomy and National Natural Science Foundation of China(U1537203) National Science Fund for Excellent Young Scholars of China(51222509) National Natural Science Foundation of China(51175429)
【分类号】：TG146.23

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