On the correlative microscopy analyses of nano-twinned domains in 2 mol % zirconia alloyed yttrium tantalate thermal barrier material

K. Gururaj; Mainak Saha; Sumit Kumar Maurya; Rajat Nama; A. Alankar; M.B. Ponnuchamy; K.G. Pradeep

doi:10.48505/nims.4630

Article On the correlative microscopy analyses of nano-twinned domains in 2 mol % zirconia alloyed yttrium tantalate thermal barrier material

K. Gururaj ; Mainak Saha (Metallurgical and Materials Engineering, Indian Institute of Technology, Madras) ; Sumit Kumar Maurya ; Rajat Nama ; A. Alankar ; M.B. Ponnuchamy ; K.G. Pradeep

Manuscript_2ZYT_revised_18.09.2021_RN_MS.docx

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K. Gururaj, Mainak Saha, Sumit Kumar Maurya, Rajat Nama, A. Alankar, M.B. Ponnuchamy, K.G. Pradeep. On the correlative microscopy analyses of nano-twinned domains in 2 mol % zirconia alloyed yttrium tantalate thermal barrier material. Scripta Materialia. 2022, 212 (), 114584. https://doi.org/10.48505/nims.4630

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Formation of nano-twinned domains associated with ferro-elastic transformation in 2 mol.% ZrO2 alloyed YTaO4 has been investigated using a correlative microscopy approach. Transmission Kikuchi diffraction reveals the presence of two phases, monoclinic (M) and tetragonal (T) in the material sintered at 1485 ◦C for 3 hr. The microstructure comprises of alternate nano-twinned domains with an average spacing of 154.07 ± 42.52 nm. Crystallographic symmetry based spontaneous strain analyses support the observation of single domain state. Abinitio calculations further indicate the propensity of stabilizing both M and T phases at room temperature as a function of ZrO2 alloying, without any change in chemical composition, as is evidenced by atom probe tomography.

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Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International

Keyword: Correlative microscopy, Ferroelastic transformation, Nanotwins, transmission Kikuchi diffraction, atom probe tomography

Date published: 2022-02-09

Publisher: Elsevier

Journal:

Scripta Materialia (ISSN: 03048853) vol. 212 114584

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4630

First published URL: https://doi.org/10.1016/j.scriptamat.2022.114584

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Updated at: 2024-10-08 11:52:48 +0900

Published on MDR: 2024-08-06 12:30:26 +0900

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