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Published on: May 25, 2016
Formation of nanocrystalline γ-ZrH in Zr-Nb alloy: Crystal structure and twinning
Xinu Tan1, Yushun Liu2, Feitao Li3
1Electron 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.
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, Zr2H2 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]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.
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