TY - JOUR
T1 - Regulate local chemical order to achieve high strength and ductility in TiZrNbVAl lightweight high entropy alloys via adding oxygen
AU - Cui, Jiaxiang
AU - Dou, Bang
AU - Sui, Mingbin
AU - Cui, Ning
AU - Wang, Benpeng
AU - Sun, Shihai
AU - Cai, Hongnian
AU - Wang, Liang
AU - Xue, Yunfei
N1 - Publisher Copyright:
© 2024 Elsevier B.V.
PY - 2024/7
Y1 - 2024/7
N2 - TiZrNbVAl lightweight high-entropy alloys (LHEAs) with body-centered cubic (BCC) structure have received extensive attention due to their low density and considerable mechanical properties. And the mechanical properties of these LHEAs can be further improved by adjusting the local chemical order (LCO). Here, we report a strategy for regulating LCOs in TiZrNbVAl LHEAs by adding oxygen. The results showed that the yield strength of LHEA increased from 787.8 MPa to 1029.5 MPa after oxygen addition. Moreover, the microstructure evolution proves that LCOs is conducive to promoting the transition of dislocation from plane slip, which is easy to produce stress concentration, to multistage slip, which improves the homogenizing deformation ability, and increasing the ductility from 12.8 % to 20.9 %, which is an increase of ∼63 %. Our work provides a paradigm for achieving outstanding strength-ductility tradeoff in BCC-LHEAs via O doping.
AB - TiZrNbVAl lightweight high-entropy alloys (LHEAs) with body-centered cubic (BCC) structure have received extensive attention due to their low density and considerable mechanical properties. And the mechanical properties of these LHEAs can be further improved by adjusting the local chemical order (LCO). Here, we report a strategy for regulating LCOs in TiZrNbVAl LHEAs by adding oxygen. The results showed that the yield strength of LHEA increased from 787.8 MPa to 1029.5 MPa after oxygen addition. Moreover, the microstructure evolution proves that LCOs is conducive to promoting the transition of dislocation from plane slip, which is easy to produce stress concentration, to multistage slip, which improves the homogenizing deformation ability, and increasing the ductility from 12.8 % to 20.9 %, which is an increase of ∼63 %. Our work provides a paradigm for achieving outstanding strength-ductility tradeoff in BCC-LHEAs via O doping.
KW - Deformation mechanism
KW - Interstitial atoms
KW - Lightweight high-entropy alloys
KW - Local chemical order
UR - http://www.scopus.com/inward/record.url?scp=85194321615&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2024.146721
DO - 10.1016/j.msea.2024.146721
M3 - Article
AN - SCOPUS:85194321615
SN - 0921-5093
VL - 906
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 146721
ER -