Ling Qiao, R.V Ramanujan, Jingchuan Zhu. (2023). Tensile deformation behavior and strengthening mechanism of a Fe2.5Ni2.5CrAl multi-principal element alloy. Materials & Design, Volume 230,111963, ISSN 0264-1275. https://doi.org/10.1016/j.matdes.2023.111963.
Abstract:
The microstructure and tensile deformation behavior of a Fe2.5Ni2.5CrAl multi-principal element alloy (MPEA) were investigated.
The combined effect of the soft FCC phase and the hard BCC+B2 microconstituent resulted in a best-in-class strength-ductility
combination. The stress-strain relationship obtained from nano-indentation tests agrees well with the tensile stress-strain curves.
The fracture surface of Fe2.5Ni2.5CrAl MPEAs indicates the ductile fracture. Cracks tend to form at the interfaces of the FCC/BCC
phases and expand along the voids by plastic deformation. Both dislocations and deformation twinning were responsible for the
excellent properties. Second phase strengthening resulted in the largest strength increment. MD simulations revealed the formation
of the HCP structure and stacking faults. Shockley dislocations were the key factor in the deformation behavior. Our study has shown
best-in-class strength-ductility combination in a commercially relevant multi principal element alloy, the results are promising for
several industrial applications.
License type:
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
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