An in situ tensile X-ray diffraction (XRD) set-up with an area detector was employed to characterize deformation behaviors of individual phases in a commercial dual-phase β-Ti alloy. A developed analytical approach based on the modified Williamson-Hall plot accounting for dislocation evolution was proposed to elucidate the deformation mechanism of each phase from the in situ XRD data. A commercial purity titanium (alpha type, α-Ti) alloy was examined as a comparison to assist identifying the influence of inter-phase interaction on the deformation behavior of the β-Ti alloy. We found that the small amount of the fine lamella shaped hcp (α) precipitates, which is only 5% in volume, has great effects on the deformation mechanism of the bcc (β) matrix in the β-Ti alloy due to the Burger's orientation relationship (BOR) between the two phases. Due to the reason that slip on the coherent plane of (211)_β of the β phase (i.e. (10 $\bar{1}0$)_α plane of the α phase) is more predominant than that of (110)_β plane (i.e. (0002)_α plane) in a hcp ploycrystal, slip on (211)_β plane is easier than that on (110)_β plane in the β-Ti alloy (cf. {110} < 111 > is the typical slip system in single phase bcc polycrystals). Although slip on (211)_β plane is the most facile, lattice strain on (211)_β plane is not the smallest, manifesting that stress/strain redistribution between α precipitates and β matrix occurred to accommodate the inter-phase interaction.

一个原位拉伸X射线衍射（XRD）的建立与区域检测器被用于各相的特征分析变形行为在商业双相β-Ti合金。提出了一种基于改进的Williamson-Hall图的解析分析方法，该方法考虑了位错演化，以从原位阐明每个相的变形机制。XRD数据。作为比较产品，对商品级纯钛（α型，α-Ti）合金进行了比较，以帮助确定相间相互作用对β-Ti合金变形行为的影响。我们发现，由于Burger's取向，少量的薄片状hcp（α）细小析出物（体积仅5％）对β-Ti合金中bcc（β）基质的变形机理有很大影响两个阶段之间的关系（BOR）。由于在β相的（211）_β相干平面（即（10$\overline{\mathrm{1个}}0$）在hcp多晶中，α相的_α平面比（110）_β平面（即（0002）_α平面）更占优势，在（211）_β平面上的滑动比在（110）_β平面上的滑动更容易β-Ti合金（参见{110} <111>是单相bcc多晶中的典型滑移系统）。虽然上（211）滑动_β平面是最容易的，晶格应变上（211）_β平面不是最小，表现之间α析出物和β基质发生以容纳相间相互作用的应力/应变的再分配。