Variant selection during phase transformation creates a specific transformation texture and finally affects the mechanical properties of the alloys. The transformation lattice deformation associated selection mechanism has not been well addressed. In the present work, the α variant selection in a Ti–7Mo–3Nb–3Cr–3Al alloy under isothermal compression at low temperature was investigated. The results show that the selection of the α variants is strongly affected by the imposed strain and the load with the dependence on the effective strain distribution induced by macroscopic shape deformation. In the center region of the compressed sample, 4 Burgers orientation relationship (BOR) variants orienting in four different directions and forming two sets of ‘cross-shaped’ clusters were selected. Such variants consumed the maximum strain contribution to the macroscopic compression. In the edge region of the compressed sample, only 2 BOR variants with 90°/<1 1.38 $\overline{2.38}$ 0> or 10°/<0001> disorientation relationship were selected. The selection criterion was still obeyed by the variants but with restriction from the local effective strain distribution induced by macroscopic shape deformation. The present work provides the clear information on the interweaving of the imposed compression with the internal lattice deformation and its impact on the β to α transformation variant selection.

相变过程中的变体选择会产生特定的转变纹理，并最终影响合金的机械性能。与转换晶格变形相关的选择机制尚未得到很好的解决。在目前的工作中，研究了低温等温压缩下 Ti-7Mo-3Nb-3Cr-3Al 合金中 α 变体的选择。结果表明，α 变体的选择受外加应变和载荷的强烈影响，并依赖于宏观形状变形引起的有效应变分布。在压缩样品的中心区域，选择了 4 个 Burgers 取向关系 (BOR) 变体，它们在四个不同的方向上取向并形成两组“十字形”簇。这些变体消耗了对宏观压缩的最大应变贡献。在压缩样本的边缘区域，只有 2 个 BOR 变体 90°/<1 1.38$\overline{2.38}$选择了 0> 或 10°/<0001> 迷失方向关系。变体仍然遵守选择标准，但受到宏观形状变形引起的局部有效应变分布的限制。目前的工作提供了关于施加压缩与内部晶格变形的交织及其对 β 到 α 变换变体选择的影响的清晰信息。