In this study, typical microstructural characteristics of a metastable β Ti alloy (Ti–5Al–5Mo–5V–3Cr–1Fe) forged in a dual-phase region (strain of 54% at 820 °C) were investigated in detail by the combined use of X-ray diffraction, energy dispersive spectroscopy, electron channeling contrast imaging and electron backscatter diffraction techniques. Results show that the microstructure of the forged alloy is composed of bulk α grains, α plates and β matrix. The bulk α grains correspond to retained primary α phase (α_p, average grain size ~ 2.4 μm), while the α plates are secondary α phase (α_s, width ~ 70 nm) precipitated from the β matrix during air cooling. During forging, the β matrix experiences dynamic recovery with many subgrains and significant orientation gradients formed. Analyses of the orientation relationship between the α and β phases show that the Burgers orientation relationship is not maintained between some α_p and β phases, which should be related to thermal deformation-induced changes of their orientations. In contrast, all of the α_s plates are found to maintain well the Burgers orientation relationship with the β phase.

在这项研究中，亚稳的典型显微结构特征β在双相区锻造（在820℃下的54％的应变）Ti合金（Ti系5Al金属-5Mo-5V-3CR-1FE）进行了详细的由组合的研究使用X射线衍射，能量色散光谱学，电子通道对比度成像和电子背散射衍射技术。结果表明，锻造合金的微观组织由块状α晶粒，α板和β基体组成。堆积α晶粒对应于保留初级α相（α _p，平均晶粒尺寸〜2.4微米），而α板是二次α相（α_小号，宽度〜70纳米）从沉淀的β空气冷却期间矩阵。在锻造过程中，β基体会动态恢复，并具有许多亚晶粒，并形成明显的取向梯度。之间的取向关系的分析α和β相表明，伯格斯取向关系没有被维持一些之间α _p和β相，其应与它们的取向的热变形引起的变化。与此相反，所有的的α_小号板被发现保持很好地与伯格斯取向关系β相。