TY - JOUR
T1 - Microstructure and mechanical property of novel L12 nanoparticles-strengthened CoFeNi-based medium entropy alloys
AU - Wang, Lei
AU - Wu, Xinyuan
AU - Su, Haijun
AU - Deng, Bo
AU - Liu, Gang
AU - Han, Zhenhua
AU - Su, Yanning
AU - Huang, Yuandong
AU - Zhang, Yunpeng
AU - Shen, Jun
AU - Zhang, Guojun
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/4/18
Y1 - 2022/4/18
N2 - A novel L12 nanoparticles-strengthened (CoFeNi)84Ti8V8 medium entropy alloy (MEA) is fabricated. It has typically equiaxed grains (mean grain size: ∼65 μm) in which the near-spherical L12 particles (mean size: ∼23 nm) are uniformly distributed with a volume fraction of ∼45%. This L12 nanoparticle is identified as the novel (Ni,Co,Fe)3(Ti,V) phase. (CoFeNi)84Ti8V8 MEA has an excellent combination of high yield strength (∼950 MPa) and ultimate tensile strength (∼1394 MPa) and good ductility (∼25%). Compared to single-phase (fcc) CoFeNi base alloy, the yield strength and ultimate tensile strength of (CoFeNi)84Ti8V8 MEA increase by ∼428% and ∼215%, respectively. This is mainly attributed to the precipitation strengthening of L12 nanoparticles. The dimple features in the fracture surface imply a good ductility. Moreover, the main deformation mode is dominated by dislocation slips and microbands.
AB - A novel L12 nanoparticles-strengthened (CoFeNi)84Ti8V8 medium entropy alloy (MEA) is fabricated. It has typically equiaxed grains (mean grain size: ∼65 μm) in which the near-spherical L12 particles (mean size: ∼23 nm) are uniformly distributed with a volume fraction of ∼45%. This L12 nanoparticle is identified as the novel (Ni,Co,Fe)3(Ti,V) phase. (CoFeNi)84Ti8V8 MEA has an excellent combination of high yield strength (∼950 MPa) and ultimate tensile strength (∼1394 MPa) and good ductility (∼25%). Compared to single-phase (fcc) CoFeNi base alloy, the yield strength and ultimate tensile strength of (CoFeNi)84Ti8V8 MEA increase by ∼428% and ∼215%, respectively. This is mainly attributed to the precipitation strengthening of L12 nanoparticles. The dimple features in the fracture surface imply a good ductility. Moreover, the main deformation mode is dominated by dislocation slips and microbands.
KW - Medium entropy alloy
KW - Precipitation strengthening
KW - Tensile property
UR - https://www.scopus.com/pages/publications/85125457776
U2 - 10.1016/j.msea.2022.142917
DO - 10.1016/j.msea.2022.142917
M3 - 文章
AN - SCOPUS:85125457776
SN - 0921-5093
VL - 840
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 142917
ER -