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Lattice Distortion Effects on Mechanical Properties in Nb-Ti-V-Zr Refractory Medium-Entropy Alloys
Xiaochang Xie1, Ping Yang1, Yuefei Jia2,3
1AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China.
Materials (Basel, Switzerland)
|July 30, 2025
Summary
This study on niobium-titanium-vanadium-zirconium (Nb-Ti-V-Zr) medium-entropy alloys (MEAs) reveals that moderate lattice distortion optimizes mechanical properties. Controlled distortion enhances strength and ductility for extreme environments.
Area of Science:
- Materials Science
- Metallurgy
- Solid-state Physics
Background:
- Medium-entropy alloys (MEAs) exhibit unique structure-property relationships.
- Niobium-titanium-vanadium-zirconium (Nb-Ti-V-Zr) alloys are promising candidates for demanding applications.
- Lattice distortion is a key factor influencing alloy properties.
Purpose of the Study:
- To investigate the impact of varying lattice distortion on the mechanical behavior of Nb-Ti-V-Zr MEAs.
- To determine the optimal level of lattice distortion for achieving a balance between strength and ductility.
- To provide design guidelines for high-performance MEAs.
Main Methods:
- Synthesis and characterization of two Nb-Ti-V-Zr alloy series: Nb(Ti1.5V)xZr and Nb(TiV)xZr.
- Analysis of atomic size mismatches and lattice distortion.
- Evaluation of mechanical properties, including yield strength and ductility.
Main Results:
- Nb(TiV)xZr alloys showed greater lattice distortion and higher yield strength due to solid-solution strengthening.
- Excessive lattice distortion led to reduced plasticity, compromising the strength-ductility balance.
- Moderate lattice distortion was found to be crucial for achieving superior strength and ductility.
Conclusions:
- Lattice distortion significantly influences the mechanical properties of Nb-Ti-V-Zr MEAs.
- Optimizing lattice distortion is essential for designing alloys with both high strength and high ductility.
- These findings guide the development of body-centered cubic (BCC) MEAs for extreme environments.
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