Electron backscatter diffraction studies of focused ion beam induced phase transformation in cobalt

Journal Article · Sat Oct 15 00:00:00 EDT 2016 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2016.09.004· OSTI ID:22689633

Day, A. P. ^[1]; Cox, D. C. ^[2]

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1. Aunt Daisy Scientific Ltd, Claremont House, High St, Lydney GL15 5DX (United Kingdom)
2. National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW (United Kingdom)

A focused ion beam microscope was used to induce cubic to hexagonal phase transformation in a cobalt alloy, of similar composition to that of the binder phase in a hardmetal, in a controlled manner at 0°, 45° and 80° ion incident angles. The cobalt had an average grain size of ~ 20 μm, allowing multiple orientations to be studied, exposed to a range of doses between 6 × 10{sup 7} and 2 × 10{sup 10} ions/μm{sup 2}. Electron backscatter diffraction (EBSD) was used to determine the original and induced phase orientations, and area fractions, before and after the ion beam exposure. On average, less phase transformation was observed at higher incident angles and after lower ion doses. However there was an orientation effect where grains with an orientation close to (111) planes were most susceptible to phase transformation, and (101) the least, where grains partially and fully transformed at varying ion doses. - Highlights: •Ion-induced phase change in FCC cobalt was observed at multiple incidence angles. •EBSD was used to study the relationship between grain orientation and transformation. •Custom software analysed ion dose and phase change with respect to grain orientation. •A predictive capability of ion-induced phase change in cobalt was enabled.

• OSTI ID: 22689633
• Journal Information: Materials Characterization, Vol. 120; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BACKSCATTERING
COBALT
COBALT ALLOYS
DAMAGE
DOSES
ELECTRON DIFFRACTION
FCC LATTICES
GRAIN ORIENTATION
GRAIN SIZE
INCIDENCE ANGLE
ION BEAMS
IONS
MICROSCOPES
PHASE TRANSFORMATIONS