TY - JOUR
T1 - Dynamic mechanical response of TaMoNbZrTi refractory high entropy alloy via multi-wire arc additive manufacturing
AU - Zhou, Yujing
AU - Peng, Siyi
AU - Guo, Yueling
AU - Di, Xinglong
AU - Liu, Bin
AU - Liu, Changmeng
N1 - Publisher Copyright:
© 2025 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2025
Y1 - 2025
N2 - Here, the TaMoNbZrTi refractory high entropy alloy (RHEA) is fabricated by multi-wire arc additive manufacturing (MWAAM), and the dynamic mechanical behaviour is analysed. A pre-alloyed droplet transfer mode is proposed to facilitate decent metallurgical reactions of different wire feedstocks, with the assistance of hot-wire and pulsed arc processing. The RHEA exhibits dendritic microstructures and consists of two Body-Centered-Cubic (BCC) phases. Dynamic compression testing suggests that as the strain rate increases from 920 to 4100 s−1, the yield strength of the RHEA is boosted by ∼158%, and the fracture strain increases by ∼72%. More dislocations appear at the Zr-Ti-rich interdendritic region with 4.0 × 1014 /m2 geometrically necessary dislocations (GND) density, compared with the dendrite with 2.1 × 1014 /m2 GND density, and they accumulate around the Ta-Mo-Nb-rich cellular particles. Our work provides an efficient pathway for the one-step additive manufacturing of RHEAs and makes a pioneering exploration of their microstructures and dynamic mechanical behaviour.
AB - Here, the TaMoNbZrTi refractory high entropy alloy (RHEA) is fabricated by multi-wire arc additive manufacturing (MWAAM), and the dynamic mechanical behaviour is analysed. A pre-alloyed droplet transfer mode is proposed to facilitate decent metallurgical reactions of different wire feedstocks, with the assistance of hot-wire and pulsed arc processing. The RHEA exhibits dendritic microstructures and consists of two Body-Centered-Cubic (BCC) phases. Dynamic compression testing suggests that as the strain rate increases from 920 to 4100 s−1, the yield strength of the RHEA is boosted by ∼158%, and the fracture strain increases by ∼72%. More dislocations appear at the Zr-Ti-rich interdendritic region with 4.0 × 1014 /m2 geometrically necessary dislocations (GND) density, compared with the dendrite with 2.1 × 1014 /m2 GND density, and they accumulate around the Ta-Mo-Nb-rich cellular particles. Our work provides an efficient pathway for the one-step additive manufacturing of RHEAs and makes a pioneering exploration of their microstructures and dynamic mechanical behaviour.
KW - dynamic mechanical behaviour
KW - microstructure
KW - multi-wire arc additive manufacturing
KW - Refractory high entropy alloys
UR - http://www.scopus.com/inward/record.url?scp=85214895461&partnerID=8YFLogxK
U2 - 10.1080/14786435.2024.2447040
DO - 10.1080/14786435.2024.2447040
M3 - Article
AN - SCOPUS:85214895461
SN - 1478-6435
JO - Philosophical Magazine
JF - Philosophical Magazine
ER -