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Deformation mechanisms of Mo alloyed FeCoCrNi high entropy alloy: In situ neutron diffraction

Cai, B; Liu, B; Kabra, S; Wang, Y; Yan, K; Lee, PD; Liu, Y; (2017) Deformation mechanisms of Mo alloyed FeCoCrNi high entropy alloy: In situ neutron diffraction. Acta Materialia , 127 pp. 471-480. 10.1016/j.actamat.2017.01.034. Green open access

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Abstract

A FeCoCrNiMo0.23 high entropy alloy was processed by powder metallurgy with two conditions: hot extruded and annealed. In situ neutron diffraction, together with electron microscopy, was used to study the deformation mechanisms and concomitant microstructural evolution for both conditions. The as-extruded alloy has a single face-centered-cubic structure with a calculated stacking fault energy of ∼19 mJ/m2. When the alloy is tensile deformed, nano-twins and microbands are induced, resulting in an excellent combination of strength and ductility (784 MPa ultimate tensile strength and over 50% elongation). Annealing at 800 °C for 72 h increases the strength of the alloy but decreases its ductility. This is due to the decomposition of the alloy after annealing, causing the formation of Mo-rich intermetallic particles and a decrease of the stacking fault probability. These results highlight that combined mechanisms (i.e. solute strengthening and twin/microband induced plasticity) can effectively improve both the strength and ductility of high entropy alloys.

Type: Article
Title: Deformation mechanisms of Mo alloyed FeCoCrNi high entropy alloy: In situ neutron diffraction
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.actamat.2017.01.034
Publisher version: https://doi.org/10.1016/j.actamat.2017.01.034
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Materials Science, Multidisciplinary, Metallurgy & Metallurgical Engineering, Materials Science, High entropy alloy, Neutron diffraction, Twin induced plasticity, Lattice strains, Stacking faults, INDUCED PLASTICITY STEEL, STACKING-FAULT ENERGY, X-RAY-DIFFRACTION, AL-C STEEL, TENSILE DEFORMATION, TWIP STEEL, DISLOCATION SUBSTRUCTURE, AUSTENITIC STEELS, DAMAGE-TOLERANCE, MICROSTRUCTURE
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10049196
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