Electron Microscopy Center, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; International Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
Electron Microscopy Center, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; Department of Mechanical Engineering, University of Manitoba, 15 Gillson Street, Winnipeg MB R3T 5V6, Canada.
Micron. 2023 Apr;167:103414. doi: 10.1016/j.micron.2023.103414. Epub 2023 Jan 14.
In the present work, the lattice parameter and the twins of γ-ZrH hydride in Zr-2.5Nb-1Si were characterized using high resolution electron microscopy. The lattice parameters of γ-ZrH (P4/mmc, ZrH unit cell) is determined to be a = 0.336 nm, c = 0.508 nm. Twinning γ-ZrH hydride ({011}<01̅1> type) is for the first time reported in zirconium alloys, whose orientation relationship with α-Zr is [100] // [12̅10] and (011) // (0002). The formation process of γ-ZrH twins is also discussed based on a 'grow-in' mechanism during the transformation from α-Zr to γ-ZrH hydride.
在本工作中，采用高分辨电子显微镜对 Zr-2.5Nb-1Si 中 γ-ZrH 氢化物的晶格参数和孪晶进行了表征。确定 γ-ZrH（P4/mmc，ZrH 单胞）的晶格参数为 a = 0.336nm，c = 0.508nm。首次在锆合金中报道了孪晶 γ-ZrH（{011}<01̅1>型），其与 α-Zr 的取向关系为[100]//[12̅10]和（011）//（0002）。还基于从 α-Zr 向 γ-ZrH 氢化物转变过程中的“生长”机制，讨论了 γ-ZrH 孪晶的形成过程。
