Projects per year
Grain growth and phase stability of a nanocrystalline face-centered cubic (fcc) Ni0.2Fe0.2Co0.2Cr0.2Cu0.2 high-entropy alloy (HEA), either thermally- or irradiation-induced, are investigated through in situ and post-irradiation transmission electron microscopy (TEM) characterization. Synchrotron and lab x-ray diffraction measurements are carried out to determine the microstructural evolution and phase stability with improved statistics. Under in situ TEM observation, the fcc structure is stable at 300 °C with a small amount of grain growth from 15.8 to ~20 nm being observed after 1800 s. At 500 °C, however, some abnormal growth activities are observed after 1400 s, and secondary phases are formed. Under 3 MeV Ni room temperature ion irradiation up to an extreme dose of nearly 600 displacements per atom, the fcc phase is stable and the average grain size increases from 15.6 to 25.2 nm. Grain growth mechanisms driven by grain rotation, grain boundary curvature, and disorder are discussed.
|Number of pages||1|
|Early online date||1 May 2019|
|Publication status||Published - 19 Jul 2019|
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- Department of Engineering and Technology - Research Professor
- School of Computing and Engineering
- Ion Beam Centre - Director
- 1 Finished
World Class Materials Facilities at the University of Huddersfield
Ball, A., Donnelly, S., Vishnyakov, V., Hinks, J. & Greaves, G.
1/04/15 → 31/03/16