Qiao, L., Ramanujan, R. V., Zhu, J. (2023). Uncovering wear mechanism of a Fe2Ni2CrAl multi-principal elements alloy. Journal of Materials Science, 58(6), 2660–2675. https://doi.org/10.1007/s10853-023-08193-0
Abstract:
Fe2Ni2CrAl multi-principal elements alloy (MPEA) has been regarded as promising candidate for engineering application due to
its desirable combination of strength and plasticity. In this work, the microstructure, hardness and wear resistance of Fe2Ni2CrAl
MPEA was systematically investigated. This alloy has a dual-phase structure, comprised of the FCC and BCC/+B2 phase. The
average nanohardness is 4.59 GPa and the average elastic modulus is 199.4 GPa. By performing reciprocating ball-on-flat friction
tests, the Fe2Ni2CrAl MPEA shows good wear resistance, with a wear rate of 8.72×10−5mm3/(Nm) and average friction coefficient
of ∼0.54. The wear mechanisms are a mixture of adhesive, abrasive and oxidation wear, accompanied by cracks and delamination.
Molecular dynamics (MD) was utilized to study the wear behavior at nano-scale. The surface suffers severer deformation during
the first slide. Then the reciprocating friction contributes to the surface strain hardening in the later slide. The large displacement
and shear strain region were concentrated below the rigid ball, the atomic damage were identified. Fewer dislocations are produced
during reciprocating friction, accompanied with the reduced atomic shear strain and lattice deterioration. The Shockley type dislocation
plays a dominant role in the whole nano wear process. This work explored the friction behavior in depth and provided a deep
insight into wear mechanisms for Fe2Ni2CrAl MPEAs.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the Agency for Science, Technology and Research - Structural Metal Alloys Programme
Grant Reference no. : A18B1b0061
This research / project is supported by the Agency for Science, Technology and Research - AME Programmatic Fund
Grant Reference no. : A1898b0043
Description:
This is a post-peer-review, pre-copyedit version of an article published in Journal of Materials Science. The final authenticated version is available online at: http://dx.doi.org/10.1007/s10853-023-08193-0