Nanolamellar hybrid high-entropy alloys with superior micromechanical properties
Abstract
Metallic materials with nanolamellar structures, such as pearlitic steels, exhibit high strength with appropriate ductility. Considering the potential ability of such nanolamellar structures to break the traditional strength-ductility trade-off in metallic alloys, this study aims at developing a unique nanolamellar structure with superior micromechanical properties by combining two different highentropy alloys (HEAs). Al0.1CoCrFeNi with the face-centered cubic (FCC) structure is combined with TiZrHfNbTa with the body-centered cubic (BCC) structure using high-pressure torsion (HPT) of half discs of each alloy. That way, a layered hybrid structure was formed, with layer thickness down to about 61 nm. The BCC/FCC nanolamellar hybrid structure exhibits an exceptional combination of properties with an ultimate tensile strength of 2.4 GPa, a maximum bending strength of 4.0 GPa, and a hardness of 740 Hv, while retaining some ductility/plasticity under both tensile and bending loads. Detailed analyses by synchrotron diffraction, electron microscopy and atom probe tomography suggests that these high strength and hardness, which are superior to those of nanostructured HEAs, result from: (i) extreme grain boundary strengthening from nanograins with a mean size of 22 nm, (ii) presence of defects such as dislocations in FCC and BCC, stacking faults in FCC and twins in FCC, and (iii) interphase hardening from BCC/FCC nanolamellar boundaries with about 30% contribution to the total hardness. This work demonstrates that combining two HEAs using HPT into a defect-rich hybrid nanolamellar composite forms a promising synergy of ultrahigh strength and reasonable ductility/plasticity.
Versions
Related
- Multi-task deep-learning optimization of trade-off properties for superior-performance Fe-based soft magnetic alloys
- Synthesis and properties of (FeSnPbSb)S quinary sulphides: Bridging mechanochemical and high-entropy concepts
- Machine Learning Assisted Design of Complex and High Entropy Alloys by Hybrid HiPIMS/Pulsed-DC PVD Process for Low Carbon Energy Applications in Extreme Environments
- Photoresponse properties of single-crystalline thick film based on high-entropy topological insulator (Bi3/4Sb1/4)2(Te2/5Se2/5S1/5)3
- Atomic investigations on the mechanical properties of CoCrNi medium-entropy alloy nanowires
BibTeX
@article{dangwal2026nanolamellar,
title = {{Nanolamellar hybrid high-entropy alloys with superior micromechanical properties}},
author = {Shivam Dangwal and Yoji Mine and Shohei Ueki and Xavier Sauvage and Fabien Cuvilly and Liliana Romero Resendiz and Muhammad Naeem and Kaveh Edalati},
journal = {Journal of Alloys and Compounds},
year = {2026},
month = sep,
doi = {10.1016/j.jallcom.2026.190702},
url = {https://normandie-univ.hal.science/hal-05763700v1},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Nanolamellar hybrid high-entropy alloys with superior micromechanical properties
AU - Shivam Dangwal
AU - Yoji Mine
AU - Shohei Ueki
AU - Xavier Sauvage
AU - Fabien Cuvilly
AU - Liliana Romero Resendiz
AU - Muhammad Naeem
AU - Kaveh Edalati
PY - 2026
DA - 2026/09/25
JO - Journal of Alloys and Compounds
DO - 10.1016/j.jallcom.2026.190702
UR - https://normandie-univ.hal.science/hal-05763700v1
AB - Metallic materials with nanolamellar structures, such as pearlitic steels, exhibit high strength with appropriate ductility. Considering the potential ability of such nanolamellar structures to break the traditional strength-ductility trade-off in metallic alloys, this study aims at developing a unique nanolamellar structure with superior micromechanical properties by combining two different highentropy alloys (HEAs). Al0.1CoCrFeNi with the face-centered cubic (FCC) structure is combined with TiZrHfNbTa with the body-centered cubic (BCC) structure using high-pressure torsion (HPT) of half discs of each alloy. That way, a layered hybrid structure was formed, with layer thickness down to about 61 nm. The BCC/FCC nanolamellar hybrid structure exhibits an exceptional combination of properties with an ultimate tensile strength of 2.4 GPa, a maximum bending strength of 4.0 GPa, and a hardness of 740 Hv, while retaining some ductility/plasticity under both tensile and bending loads. Detailed analyses by synchrotron diffraction, electron microscopy and atom probe tomography suggests that these high strength and hardness, which are superior to those of nanostructured HEAs, result from: (i) extreme grain boundary strengthening from nanograins with a mean size of 22 nm, (ii) presence of defects such as dislocations in FCC and BCC, stacking faults in FCC and twins in FCC, and (iii) interphase hardening from BCC/FCC nanolamellar boundaries with about 30% contribution to the total hardness. This work demonstrates that combining two HEAs using HPT into a defect-rich hybrid nanolamellar composite forms a promising synergy of ultrahigh strength and reasonable ductility/plasticity.
SN - 0925-8388
ER -