Kotzurek J A, Hofmann M, Simic S, Pölt P, Hohenwarter A, Pippan R, Sprengel W, Würschum R
Institute of Materials Physics, Graz University of Technology, Graz, Austria.
Research Neutron Source Heinz Maier-Leibnitz (FRM II), Technical University of Munich, Garching, Germany.
Philos Mag Lett. 2017 Dec 13;97(11):450-458. doi: 10.1080/09500839.2017.1408966. eCollection 2017.
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.
对通过高压扭转制备的亚微晶镍进行中子衍射和差示膨胀法的联合研究，旨在研究膨胀法过程中的各向异性行为及其与内应力和结构各向异性的关系。在膨胀仪样品中未检测到宏观应力。连同诸如冷轧后等特定测试一起，这表明观察到的退火时各向异性长度变化不是由内应力引起的，而是可以由固有微观结构来解释，即形状各向异性微晶的晶界处弛豫空位的各向异性退火。
