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Multi-Phase Design Strategy for Synergistic Strength-Ductility Optimization in V-Ti-Cr-Nb-Mo Refractory High-Entropy
Xinwen Liang1, Jiahao Zhu1, Zhenjiao Tan1
1Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Nanning 530004, China.
Adjusting elemental ratios and heat treatments in refractory high-entropy alloys balances strength and ductility. Multi-phase V-Ti-Cr-Nb-Mo alloys show enhanced mechanical properties, offering a foundation for alloy design.
Area of Science:
- Materials Science
- Metallurgy
- Alloy Design
Background:
- Refractory high-entropy alloys (RHEAs) are crucial for demanding applications due to their unique properties.
- Balancing strength and ductility in RHEAs remains a significant challenge.
- Multi-phase microstructures offer a promising route to achieve superior mechanical synergy.
Purpose of the Study:
- To investigate the effect of elemental composition and heat treatment on the microstructure and mechanical properties of V-Ti-Cr-Nb-Mo alloys.
- To explore the correlation between phase constitution (BCC, HCP, Laves) and the strength-ductility balance.
- To establish a basis for optimizing RHEAs through compositional control and thermal processing.
Main Methods:
- Design and synthesis of five V-Ti-Cr-Nb-Mo alloy compositions.
- Annealing treatment at 1200 °C for 8 hours.
- Systematic characterization of crystal structure, microstructure evolution, and mechanical properties (compressive strength, ductility).
Main Results:
- V-Ti-Cr-Nb-Mo alloys exhibited dual-phase (BCC + HCP) or triple-phase (BCC + HCP + Laves) structures.
- As-cast alloy V15Ti30Cr5Nb35Mo15 showed a triple-phase structure with 1775 MPa strength and 18.2% ductility.
- Annealing refined microstructure, reduced Laves phase, and significantly improved ductility, with alloy V5Ti35Cr5Nb40Mo15 achieving 26.9% ductility at 1530 MPa.
Conclusions:
- Elemental ratio and heat treatment are effective in controlling phase fractions and balancing strength-ductility in RHEAs.
- Multi-phase RHEAs, particularly those with BCC and HCP phases, demonstrate significant potential for enhanced mechanical synergy.
- This study provides critical insights for designing high-performance RHEAs with tailored microstructures and properties.
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