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Instruments / Technical Area	Publication Details	Published	Actions
E02-JEM ARM 300CF	In-situ TEM study of irradiation-induced damage mechanisms in monoclinic-ZrO2 Junliang Liu , Anamul Haq Mir , Guanze He , Mohsen Danaie , Jonathan Hinks , Stephen Donnelly , Heidi Nordin , Sergio Lozano-Perez , Chris R. M. Grovenor Acta Materialia 199, 429 - 442 DOI: 10.1016/j.actamat.2020.08.064 Diamond Proposal Number(s): [20528, 23235] Show Abstract ▼ Abstract: We have investigated the microstructural and crystallographic evolution of nanocrystalline zirconia under heavy ion irradiation using in-situ transmission electron microscopy (TEM) and have studied the atomic configurations of defect clusters using aberration-corrected scanning transmission electron microscopy (STEM). Under heavy ion irradiation the monoclinic-ZrO2 is observed to transform into cubic phase, stabilised by the strain induced by irradiation-induced defect clusters. We suggest that the monoclinic-to-cubic transformation is martensitic in nature with an orientation relationship identified to be (100)m∥(100)c and [001]m∥[001]c. By increasing the damage dose, both the formation of voids and irradiation-induced grain growth were observed. A model for the formation of voids is proposed, taking defect interactions into consideration. The study has also demonstrated that high resolution orientation mapping by transmission Kikuchi diffraction (TKD) combined with in-situ irradiation in a TEM is a powerful method to probe the mechanisms controlling irradiation-induced processes, including grain boundary migration, phase transformations and texture evolution.	Oct 2020
I12-JEEP: Joint Engineering, Environmental and Processing	Multi-length-scale study on the heat treatment response to supersaturated nickel-based superalloys: Precipitation reactions and incipient recrystallisation Yuanbo T. Tang , Chinnapat Panwisawas , Benjamin M. Jenkins , Junliang Liu , Zhao Shen , Enrico Salvati , Yilun Gong , Joseph N. Ghoussoub , Stefan Michalik , Bryan Roebuck , Paul A. J. Bagot , Sergio Lozano-Perez , Chris R. M. Grovenor , Michael P. Moody , Alexander M. Korsunsky , David M. Collins , Roger C. Reed Additive Manufacturing 15 DOI: 10.1016/j.addma.2023.103389 Diamond Proposal Number(s): [23674] Open Access Show Abstract ▼ Abstract: A supersaturated phase microstructure is produced in Ni-based superalloys using laser powder bed fusion (L-PBF) – the cooling rate arising from the process is shown to suppress the solid-state precipitation of the phase. The response of the material to a heat treatment therefore requires new understanding at the fundamental level, since the first population of precipitate forms upon heating, in contrast to cooling from homogenisation above the solvus. Here, we have interrogated two new nickel-based superalloys designed for the L-PBF technology, both in situ and ex situ, at multiple length scales using advanced characterisation methods. First, we conducted in situ synchrotron X-ray diffraction during various heat treatments to trace the evolution of the volume fraction with temperature. The first structural changes were detected at an unexpectedly low temperature of 445 °C. Second, the temperature for nucleation and its sensitivity to heating rate was studied using an electrical resistivity method. Then, the composition upon heating, isothermal holding and cooling is analysed using atom probe tomography (APT), the result is rationalised by further scanning-transmission electron microscopy and nanoscale secondary ion mass spectroscopy. Finally, static recrystallisation during isothermal exposure was investigated, which occurs within minutes. This work sheds light on a new strategy of tailoring microstructure for additively manufactured superalloys by manipulation of the precipitate distribution upon heating.	Jan 2023

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