The dominant hydride precipitates have been well demonstrated to follow two types of orientation relationships (ORs) with Ti matrix: OR1 with $\left\{0001\right\}//\left\{001\right\}$, $<1\overline{2}10>//<110>$ and OR2 with $\left\{0001\right\}//\left\{1\overline{1}1\right\}$, $<1\overline{2}10>//<110>$. Within the grains with special orientations, the complicated interactions of different hydride variants inside Ti-hydride diffusion layer are characterized in this work. For OR1 hydride layer, the orientations of $\left\{10\overline{1}0\right\}$ plane parallel to the sample surface and a-axis parallel to the normal direction prefer multiple OR1 variants. The orientations favorable for OR2 hydride layer are: $\left\{10\overline{1}3\right\}$ plane parallel to sample surface corresponding to the layer with one OR2 variant dominated and c-axis parallel to the surface normal with multiple OR2 variant layer preferred. Furthermore, $\left\{10\overline{1}2\right\}$ extension twins and $\left\{11\overline{2}2\right\}$ contraction twins are activated to accommodate the OR2 hydride-induced surface expansion and local misfit strain. The stimulation of these two twins is also orientation-dependent: $\left\{10\overline{1}2\right\}$ and $\left\{11\overline{2}2\right\}$ twins are observed in the grains with c-axis parallel to and deviated from the surface normal, respectively. The further variant selection for each twin mode is performed through shear accommodation of hydride-twin pairs.

已充分证明主要的氢化物析出物与 Ti 基体遵循两种类型的取向关系 (OR)：OR1 与 $\left\{0001\right\}//\left\{001\right\}$, $<1\overline{2}10>//<110>$ 和 OR2 与 $\left\{0001\right\}//\left\{1\overline{1}1\right\}$, $<1\overline{2}10>//<110>$. 在具有特殊取向的晶粒内，Ti-氢化物扩散层内不同氢化物变体的复杂相互作用在这项工作中得到表征。对于 OR1 氢化物层，方向为$\left\{10\overline{1}0\right\}$平行于样品表面的平面和平行于法线方向的 a 轴更喜欢多个 OR1 变体。有利于 OR2 氢化物层的取向是：$\left\{10\overline{1}3\right\}$平行于样品表面的平面对应于具有一个 OR2​​ 变体占主导地位的层，c 轴平行于具有多个 OR2​​ 变体层的表面法线。此外，$\left\{10\overline{1}2\right\}$ 延伸双胞胎和 $\left\{11\overline{2}2\right\}$收缩双胞胎被激活以适应 OR2 氢化物引起的表面膨胀和局部失配应变。这两个双胞胎的刺激也是定向依赖的：$\left\{10\overline{1}2\right\}$ 和 $\left\{11\overline{2}2\right\}$在晶粒中观察到孪晶，c 轴分别平行于表面法线和偏离表面法线。每个孪晶模式的进一步变体选择是通过氢化物-孪晶对的剪切调节进行的。