In a groundbreaking study published in Advanced Science, a research group managed to achieve a remarkable giant magneto-superelasticity of 5% in a single crystal composed of Ni34Co8Cu8Mn36Ga14. This achievement opens up new possibilities in the field of material science by introducing arrays of ordered dislocations to shape preferentially oriented martensitic variants during a magnetically induced reverse martensitic transformation.

Elasticity, the ability of materials to return to their original shape after deformation, is a crucial property in most metals, typically characterized by a strain of 0.2%. However, shape memory and high entropy alloys can exhibit superelasticity with strains of several percent, often triggered by external stresses. The concept of magneto-superelasticity, induced by a magnetic field, holds great importance for contactless material operation, as well as the development of innovative large stroke actuators and efficient energy transducers.

The research team, led by Prof. Jiang Chengbao and Prof. Wang Jingmin from the School of Materials Science and Engineering at Beihang University, collaborated with the High Magnetic Field Laboratory at the Hefei Institutes of Physical Science of Chinese Academy of Sciences. They conducted a stress-constrained transition cycling (SCTC) training for the Ni34Co8Cu8Mn36Ga14 single crystal by applying compressive stress, resulting in the introduction of ordered dislocations with a specific orientation. These ordered dislocations played a crucial role in influencing the formation of specific martensitic variants during the reversible transformation induced by a magnetic field.

By combining the reversible martensitic transformation with the preferential orientation of martensitic variants, the single crystal achieved an unprecedented giant magneto-superelasticity of 5%. Furthermore, the researchers designed a device utilizing a pulsed magnetic field with this single crystal, demonstrating a large stroke at room temperature with a pulse width of 10 ms. The device exhibited a rapid response to an 8 ms pulse with a negligible delay of about 0.1 ms, showcasing its potential for various applications. Prof. Wang emphasized, “Our work presents an attractive strategy to access high-performance functional materials through defect engineering.”

The development of giant magneto-superelasticity in functional materials represents a significant advancement in the field of material science. The successful integration of ordered dislocations and preferentially oriented martensitic variants opens up new avenues for the design and creation of high-performance materials with unique properties. This research paves the way for the development of cutting-edge technologies and devices that can revolutionize various industries.

Physics

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