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Formation of nanocrystalline γ-ZrH in Zr-Nb alloy: Crystal structure and twinning

2023; Elsevier BV; Volume: 167; Linguagem: Inglês

10.1016/j.micron.2023.103414

1878-4291

Xinu Tan, Yushun Liu, Feitao Li, Risheng Qiu, Qing Liu,

Titanium Alloys Microstructure and Properties

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, Zr2H2 unit cell) is determined to be a = 0.336 nm, c = 0.508 nm. Twinning γ-ZrH hydride ({011} type) is for the first time reported in zirconium alloys, whose orientation relationship with α-Zr is [100]γ-twins // [12̅10]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.