TY - JOUR
T1 - The effect of aging temperature and time on nano-lamellar structure formation and tensile properties in Al10(CoFeNi1.5)90 high entropy alloy
AU - Mazullah, Dr
AU - Ismail, Muhammad
AU - Zhang, Yiming
AU - Zhang, Ke
AU - Nuam, Vung Lam
AU - Zhang, Hao
AU - Xiong, Zhiping
N1 - Publisher Copyright:
© 2025 Elsevier B.V.
PY - 2025/2/5
Y1 - 2025/2/5
N2 - Structural materials with high strength and good ductility are required by the aerospace, automotive and energy sectors. The high strength and high ductility are limited in conventional alloys due to their simple composition (two or three base elements) and well-defined microstructure (depending on the metallic base element). As a solution to this difficult challenge, we have proposed a novel strategy to design HEAs using the eutectoid nano-lamellar microstructure concept, i.e. composed of alternative lamellar phases of soft face-centered cubic (FCC) and hard body-centered cubic (BCC), both with precipitates. Here, the eutectoid nano-lamellar microstructure composed of FCC+L12 and BCC+B2 in Al10(CoFeNi1.5)90 HEA is a result of the solid-state decomposition of the single-phase recrystallized FCC matrix during heat treatment between 500 °C and 600 °C. The aging temperature is directly related to the reciprocal of the nano-lamellar thickness and the yield strength is directly correlated to the inverse square root of the lamellar. The ultimate tensile strength and ductility measured after aging at 500 °C, 550 °C, 575 °C and 600 °C are 1530.38 ± 57 MPa and 0.99 ± 0.1 %, 1509.80 ± 23 MPa and 1.31 ± 0.15 %, 1585.56 ± 5 MPa and 8.57 ± 1 %, and 1135.95 ± 8 MPa and 24.30 ± 2 %, respectively. Such tunability of microstructures and mechanical properties in the multi-component HEA is due to lattice distortions and diffusion during thermo-mechanical processes.
AB - Structural materials with high strength and good ductility are required by the aerospace, automotive and energy sectors. The high strength and high ductility are limited in conventional alloys due to their simple composition (two or three base elements) and well-defined microstructure (depending on the metallic base element). As a solution to this difficult challenge, we have proposed a novel strategy to design HEAs using the eutectoid nano-lamellar microstructure concept, i.e. composed of alternative lamellar phases of soft face-centered cubic (FCC) and hard body-centered cubic (BCC), both with precipitates. Here, the eutectoid nano-lamellar microstructure composed of FCC+L12 and BCC+B2 in Al10(CoFeNi1.5)90 HEA is a result of the solid-state decomposition of the single-phase recrystallized FCC matrix during heat treatment between 500 °C and 600 °C. The aging temperature is directly related to the reciprocal of the nano-lamellar thickness and the yield strength is directly correlated to the inverse square root of the lamellar. The ultimate tensile strength and ductility measured after aging at 500 °C, 550 °C, 575 °C and 600 °C are 1530.38 ± 57 MPa and 0.99 ± 0.1 %, 1509.80 ± 23 MPa and 1.31 ± 0.15 %, 1585.56 ± 5 MPa and 8.57 ± 1 %, and 1135.95 ± 8 MPa and 24.30 ± 2 %, respectively. Such tunability of microstructures and mechanical properties in the multi-component HEA is due to lattice distortions and diffusion during thermo-mechanical processes.
KW - High entropy alloy (HEA)
KW - Lamellar microstructure
KW - Mechanical properties
UR - http://www.scopus.com/inward/record.url?scp=85215417852&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2025.178605
DO - 10.1016/j.jallcom.2025.178605
M3 - Article
AN - SCOPUS:85215417852
SN - 0925-8388
VL - 1014
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 178605
ER -