TY - JOUR

T1 - Thermal stability and irradiation response of nanocrystalline CoCrCuFeNi high-entropy alloy

AU - Zhang, Yanwen

AU - Tunes, Matheus A.

AU - Crespillo, Miguel L.

AU - Zhang, Fuxiang

AU - Boldman, Walker L.

AU - Rack, Philip D.

AU - Jiang, Li

AU - Xu, Chen

AU - Greaves, Graeme

AU - Donnelly, Stephen E.

AU - Wang, Lumin

AU - Weber, William J.

PY - 2019/5/1

Y1 - 2019/5/1

N2 - 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.

AB - 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.

KW - chemical disorder

KW - concentrated solid solution alloys

KW - highentropy alloys

KW - ion-solid interactions

UR - http://www.scopus.com/inward/record.url?scp=85064325440&partnerID=8YFLogxK

U2 - 10.1088/1361-6528/ab1605

DO - 10.1088/1361-6528/ab1605

M3 - Article

C2 - 30947152

AN - SCOPUS:85064325440

VL - 30.2019

JO - Nanotechnology

JF - Nanotechnology

SN - 0957-4484

IS - 29

M1 - 294004

ER -