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Title: Improved Strength–Ductility Synergy of a CoCrNi Medium-Entropy Alloy by Ex Situ TiN Nanoparticles
Authors: Wang, A
Wang, J
Yang, F
Wen, T
Yang, H
Ji, S
Keywords: heat treatments;mechanical properties;medium-entropy alloys;microstructures;powder metallurgy
Issue Date: 22-Nov-2022
Publisher: Wiley-VCH GmbH
Citation: Wang, A. et al. (2022) 'Improved Strength–Ductility Synergy of a CoCrNi Medium‐Entropy Alloy by Ex Situ TiN Nanoparticles', Advanced Engineering Materials, 25 (2), 2200939, pp. 1 - 7. doi: 10.1002/adem.202200939.
Abstract: Copyright © 2022 The Authors. The introduction of ex situ reinforcement particles to increase the strength of alloys generally reduces ductility. Herein, a method to fabricate CoCrNi/TiN composite via spark plasma sintering (SPS) and rolling and annealing to achieve a superior combination of strength and ductility is presented. Under the as-SPSed condition, the CoCrNi/TiN composites exhibit the fracture strain of 41.9%, yield strength (YS) of 0.48 GPa, ultimate tensile strength (UTS) of 0.88 GPa, and hardness of 232.0 Hv. After rolling at 25 °C for the thickness reduction of 50%, the alloy presents fracture strain of 6.9%, YS of 1.24 GPa, UTS of 1.41 GPa, and hardness (408.9 Hv). After rolling at 25 °C for the thickness reduction of 50%, and annealing at 700 °C for 1 h, a good combination of YS of 0.77 GPa, UTS of 1.01 GPa, and fractured strain of 55.2% can be obtained in the samples. The superior strength–ductility synergy can be attributed to the refined structure, the formation of lattices defects (i.e., stacking faults [SFs] and Lomer–Cottrell Locks (LCs)), the interaction of nanotwin–TiN particles, and the concurrent process of potential grain boundary sliding accommodated by intragranular dislocation in the softer face-centered cubic (fcc) matrix.
Description: Data Availability Statement: The data that support the findings of this study are openly available in [National Key Research and Development Program of China] at [], reference number [52071343].
ISSN: 1438-1656
Other Identifiers: ORCID iD: Shouxun Ji
Appears in Collections:Brunel Centre for Advanced Solidification Technology (BCAST)

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