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Microstructural evolution in a precipitate-hardened (Fe0.3Ni0.3Mn0.3Cr0.1)94Ti2Al4 multi-principal element alloy during high-pressure torsion

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Abstract

Multi-principal element alloys demonstrate high strength, thermal stability, and irradiation resistance, making them excellent candidate materials for applications in nuclear reactors and other harsh environments. Some studies have examined the use of high-pressure torsion to strengthen MPEAs through grain size reduction and strain hardening. However, no studies have investigated the effect of HPT on secondary phases (precipitates) within an MPEA. Two alloys, (Fe0.3Ni0.3Mn0.3Cr0.1)94Ti2Al4 containing Ni(Ti, Al) B2 phase, and CrFe σ phase, and single-phase Fe0.3Ni0.3Mn0.3Cr0.1, were fabricated by casting and heat treatment. Both alloys were then processed with HPT to study microstructural evolution. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize the alloys before and after HPT processing. HPT processing produced a nanocrystalline structure in both alloys, but (Fe0.3Ni0.3Mn0.3Cr0.1)94Ti2Al4 exhibited a significantly smaller grain size and higher dislocation density than Fe0.3Ni0.3Mn0.3Cr0.1, with corresponding higher hardness. Before HPT, the (Fe0.3Ni0.3Mn0.3Cr0.1)94Ti2Al4 alloy consisted of large grain (~ 400 μm) and precipitates, including B2 of ~ 38 μm average size, B2 of ~ 0.7 μm average size, and small amounts of σ of ~ 1.5 µm average size. After HPT, the larger B2 precipitates were decreased in size and volume fraction, while the smaller B2 precipitates were completely dissolved; the σ precipitates appeared unaffected by HPT, likely due to their much higher hardness. Observation of the B2 precipitate distribution along radial distance indicates that the strain caused the precipitates to fracture at intermediate strain (γ = 125) and dissolve at high strain (γ = 280).

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Acknowledgements

This research was supported by a research grant (award number DMR-2207965) from U.S. National Science Foundation. RZV acknowledges the support in part from Russian Science Foundation (Grant number 22-19-00445). RKI is grateful to the Russian Science Foundation for supporting project 22-23-00714. Materials Research Center at Missouri University of Science and Technology is acknowledged for providing access to electron microscopy and X-ray diffraction Dr. Eric Bohannan is thanked for his assistance with X-ray diffraction. Characterization using the Talos F200X and JEM 2100F was performed at the Center for Nanoscale Materials at Argonne National Laboratory under user proposal 75825. Work performed at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, was supported by the U.S. DOE, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.

Funding

National Science Foundation,DMR-2207965,Haiming Wen,Russian Science Foundation,22–19-00445,Ruslan Z. Valiev,22–23-00714,Rinat K. Islamgaliev.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO, 65409, USA

    Matthew Luebbe, Jiaqi Duan & Haiming Wen

  2. Warwick Manufacturing Group, University of Warwick, Coventry, CV4 7AL, UK

    Jiaqi Duan

  3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Peipei Cao & Zhaoping Lu

  4. Institute of Physics of Advanced Materials, Ufa University of Science and Technologies, Ufa, Russia, 450076

    Rinat K. Islamgaliev & Ruslan Z. Valiev

  5. Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, 60439, USA

    Yuzi Liu

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Contributions

Matthew Luebbe: writing-original draft, conceptualization, methodology, validation, formal analysis, investigation, data curation, visualization. Jiaqi Duan: conceptualization, methodology, validation, investigation, visualization, writing-review and editing. Peipei Cao: resources, investigation. Zhaoping Lu: resources, writing-review and editing. Rinat K. Islamgaliev: investigation, writing-review and editing. Ruslan Valiev: investigation, writing-review and editing. Yuzi Liu: resources, visualization, writing-review and editing. Haiming Wen: resources, writing-review and editing, supervision, project administration, funding acquisition.

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Correspondence to Haiming Wen.

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Luebbe, M., Duan, J., Cao, P. et al. Microstructural evolution in a precipitate-hardened (Fe0.3Ni0.3Mn0.3Cr0.1)94Ti2Al4 multi-principal element alloy during high-pressure torsion. J Mater Sci (2024). https://doi.org/10.1007/s10853-024-09952-3

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