Abstract A combined study of neutron diffraction and difference dilatometry on submicrocrystalline Ni prepared by high pressure torsion aims at studying the anisotropic behaviour during dilatometry and its relation to internal stress and structural anisotropy. Macroscopic stresses were undetectable in the dilatometer samples. Along with specific tests such as post cold-rolling, this shows that an observed anisotropic length change upon annealing is not caused by internal stress, but can be explained by the inherent microstructure, i.e. the anisotropic annealing of relaxed vacancies at grain boundaries of shape-anisotropic crystallites.

中文翻译：

---

中子衍射和差示膨胀法研究亚微晶镍的内应力和缺陷相关自由体积

摘要 高压扭转法制备亚微晶镍的中子衍射和差分膨胀法联合研究旨在研究膨胀法中的各向异性行为及其与内应力和结构各向异性的关系。在膨胀计样品中无法检测到宏观应力。连同冷轧等特定测试一起，这表明观察到的退火时的各向异性长度变化不是由内应力引起的，而是可以通过固有的微观结构来解释，即形状晶界处松弛空位的各向异性退火 -各向异性微晶。