TY - JOUR
T1 - High specific yield strength TiZrAlNbV high-entropy alloys via coherent nanoprecipitation strengthening
AU - Liu, Fuxin
AU - Chen, Songshen
AU - Wang, Benpeng
AU - Wang, Liang
AU - Xiao, Yao
AU - Wang, Lu
AU - Sun, Shihai
AU - Xue, Yunfei
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/12/19
Y1 - 2022/12/19
N2 - Developing lightweight high-entropy alloys (LHEAs) having considerable strength and ductility is a new perspective in the quest of novel lightweight alloys for potential engineering applications. The paper describes that by tailoring the aging treatment, abundant coherent B2 nanoprecipitates can be induced in body-centered-cubic (BCC) Ti–Zr–Al–Nb–V LHEAs. These nanoprecipitates can strengthen the alloys by around 20% based on the dislocation-shearing mechanism. Moreover, due to the effective inhibition of these precipitates on dislocation propagation, frequent cross-slip events appear, which benefit the deformation delocalization. Finally, based on the B2 precipitation strengthening, a LHEA having specific yield strength as high as ∼202 MPa m3/kg and considerable fracture strain of ∼25% is developed. Our results provide a solution to overcome strength-ductility trade-off for the alloy to be suitable for structural applications.
AB - Developing lightweight high-entropy alloys (LHEAs) having considerable strength and ductility is a new perspective in the quest of novel lightweight alloys for potential engineering applications. The paper describes that by tailoring the aging treatment, abundant coherent B2 nanoprecipitates can be induced in body-centered-cubic (BCC) Ti–Zr–Al–Nb–V LHEAs. These nanoprecipitates can strengthen the alloys by around 20% based on the dislocation-shearing mechanism. Moreover, due to the effective inhibition of these precipitates on dislocation propagation, frequent cross-slip events appear, which benefit the deformation delocalization. Finally, based on the B2 precipitation strengthening, a LHEA having specific yield strength as high as ∼202 MPa m3/kg and considerable fracture strain of ∼25% is developed. Our results provide a solution to overcome strength-ductility trade-off for the alloy to be suitable for structural applications.
KW - Coherent nanoprecipitates strengthening
KW - Lightweight high-entropy alloys
KW - Mechanical properties
KW - Micro-structure evolution
UR - https://www.scopus.com/pages/publications/85141926336
U2 - 10.1016/j.msea.2022.144346
DO - 10.1016/j.msea.2022.144346
M3 - Article
AN - SCOPUS:85141926336
SN - 0921-5093
VL - 861
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 144346
ER -