Formation of nanocrystalline γ-ZrH in Zr-Nb alloy: Crystal structure and twinning. (April 2023)

• Record Type: Journal Article
• Authors: Tan, Xinu; Liu, Yushun; Li, Feitao; Qiu, Risheng; Liu, Qing
• Is Part Of: Micron. Volume 167(2023)
• Publication Date: 2023-04
• Subjects: Zirconium alloys -- The hydride -- Phase transition -- Electron diffraction -- Transmission electron microscopy; Microscopy -- Periodicals; Electron Probe Microanalysis -- Periodicals; Microscopy -- Periodicals; Microscopie -- Périodiques; Microscopy; Periodicals; 502.82
• DOI: 10.1016/j.micron.2023.103414
• Languages: English
• ISSNs: 0968-4328

Abstract

Abstract: 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 (P42 /mmc, Zr2 H2 unit cell) is determined to be a = 0.336 nm, c = 0.508 nm. Twinning γ-ZrH hydride ({011}<0 1 ̅ 1> type) is for the first time reported in zirconium alloys, whose orientation relationship with α-Zr is [100]γ-twins // [1 2 ̅ 10]α and (011)γ-twins // (0002)α . 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. Highlights: The lattice parameters of γ-ZrH (P42 /mmc, Zr2 H2 unit cell) is determined to be a 0.336 nm, c = 0.508 nm by transmission electron microscope. The twinning ({011}<0 1 ̅ 1> type) in γ-ZrH hydride is for the first time reported in zirconium alloys. The formation process of the twining was discussed based on a 'grow-in' mechanism during the transformation from α-Zr to γ-ZrH hydride.