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.
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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-pp.ucl.ac.uk/id/eprint/10049196 |
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