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Large Nonhysteretic Volume Magnetostriction in a Strong and Ductile High-Entropy Alloy
Junming Gou1, Yun Pan1, Tianzi Yang1
1Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.
Advanced Materials (Deerfield Beach, Fla.)
|June 26, 2024
Summary
A new magnetic high-entropy alloy (HEA) offers hysteresis-free actuation, high strength, and ductility. This breakthrough in magnetostrictive materials could enable advanced smart technologies.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Metallurgy
Background:
- Smart technologies require magnetostrictive materials with isotropic, hysteresis-free actuation, high strength, and ductility.
- Existing magnetostrictive materials face limitations: volume-conserving self-assembly, hysteresis in phase transitions, and inherent brittleness.
Purpose of the Study:
- To develop a novel magnetostrictive material addressing the challenges of hysteresis, strength, and ductility.
- To investigate the properties of a magnetic high-entropy alloy (HEA) for advanced applications.
Main Methods:
- Synthesis and characterization of a magnetic high-entropy alloy (Fe35Co35Al10Cr10Ni10).
- Evaluation of magnetostriction, mechanical properties (tensile strength, elongation strain), and performance across a temperature range (293 K to 100 K).
- Microstructural analysis to understand the origin of the observed properties.
Main Results:
- The developed HEA exhibits large, nonhysteretic volume magnetostriction.
- The material demonstrates high tensile strength and significant elongation strain.
- Exceptional properties are maintained over a wide temperature range (room temperature down to 100 K).
Conclusions:
- The novel magnetic HEA successfully overcomes key limitations of traditional magnetostrictive materials.
- Its dual-phase microstructure, featuring FCC and BCC phases, is crucial for achieving the combined magnetomechanical properties.
- This research offers a new pathway for designing advanced magnetostrictive materials for technological applications.
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