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

By B. Cai, Bin Liu, Saurabh Kabra, Yiqiang Wang, K. Yan, Peter D. Lee, Yong Liu. 2017

195 citations recorded by the source corpus.

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.

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/7f55925ecc2751f464eeaaf3c6b0bc12fec4b52d

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Citations in the corpus

In-situ SEM observation of phase transformation and twinning mechanisms in an interstitial high-entropy alloy (2018, methodology): “By employing in-situ neutron diffraction, the evolution of mechanical twinning was evaluated based on the evolution of the stacking fault probability [9].”
High-entropy alloys fabricated via powder metallurgy. A critical review (2019, methodology): “motion, especially when the thickness of the twin/ matrix lamellae decreases down to the nanoscale, also reinforcing the Hall–Petch effect [198].”