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Lookup NU author(s): Dr Peng Gong
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
This study reports that the wear rate of the heat-treated CoCrMo alloy shows a sudden transition of more than 5-fold when the load/contact pressure increases from 45 N (3.6 GPa) to 50 N (3.7 GPa). Heat treatment was used to change the structure of the commercially available CoCrMo from the initial face-centred cubic (γ-fcc) with a small amount of hexagonal close-packed (ε-hcp) to predominantly hcp ε-phase with dispersed nanoscale precipitates of σ-phase. PeakForce QNM was used to quantitatively map the local mechanical properties of the surface at the nanoscale. High-resolution transmission electron microscopy (HRTEM), scanning transmission electron microscope (STEM), energy-dispersive X-ray spectroscopy (EDX), and precession electron diffraction (PED) integrated with the TEM is used to characterize the structure and chemical composition of the worn surface and tribofilm. The possible reason for wear transition was discussed.
Author(s): Qi J, Ma L, Gong P, Rainforth WM
Publication type: Article
Publication status: Published
Journal: Wear
Year: 2023
Volume: 518-519
Print publication date: 15/04/2023
Online publication date: 04/02/2023
Acceptance date: 02/02/2023
Date deposited: 23/04/2023
ISSN (print): 0043-1648
ISSN (electronic): 1873-2577
Publisher: Elsevier
URL: https://doi.org/10.1016/j.wear.2023.204649
DOI: 10.1016/j.wear.2023.204649
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