Indentation behaviour of ion-irradiated X-750 Ni-based superalloy |
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| Authors: | P. Changizian C. Lu L. M. Wang |
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| Affiliation: | 1. Department of Mechanical and Materials Engineering, Queen’s University, Kingston, Canada;2. Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI, USA |
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| Abstract: | The mechanical properties of an ion-irradiated Ni-based superalloy have been evaluated using nano-indentation hardness tests. A high-energy Ni ion beam was employed for irradiation at room temperature up to different doses. Nano-indentation tests were carried out in the range of 100–1000 nm to measure hardness changes of the experimental alloy. The results show softening of the irradiated material compared to the un-irradiated material, with the softening being more pronounced at the higher dose. Cross-sectional transmission electron microscopy characterisation reveals that γ′-precipitate instability (disordering/dissolution) is the main reason for the softening behaviour and this outweighs the hardening effect of irradiation-induced defects. |
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| Keywords: | Ni-based superalloys ion irradiation nano-indentation transmission electron microscopy microstructural characterisation defects |
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