The Development of Giant Magneto-Superelasticity in Single Crystals

A recent research study has made significant progress in the field of materials science by achieving a giant magneto-superelasticity of 5% in a Ni34Co8Cu8Mn36Ga14 single crystal. This breakthrough was made possible by the introduction of ordered dislocations to create preferentially oriented martensitic variants during the magnetically induced reverse martensitic transformation. The findings of this study were published in the prestigious journal Advanced Science.

Elasticity is a crucial property of materials that allows them to return to their original shape after deformation. While most metals exhibit a strain of 0.2%, shape memory alloys and high entropy alloys can display superelasticity with strains of several percent under external stresses. Magneto-superelasticity, which is induced by a magnetic field, is particularly important for contactless material operation and the development of large stroke actuators and energy transducers.

The research team, comprised of experts from the High Magnetic Field Laboratory at the Hefei Institutes of Physical Science of Chinese Academy of Sciences and the School of Materials Science and Engineering at Beihang University, conducted stress-constrained transition cycling (SCTC) training on the Ni34Co8Cu8Mn36Ga14 single crystal. By applying compressive stress, the researchers were able to introduce ordered dislocations with specific orientations. These dislocations played a crucial role in influencing the formation of martensitic variants during the reversible transformation induced by a magnetic field.

Through a combination of reversible martensitic transformation and the preferential orientation of martensitic variants, the single crystal was able to achieve a remarkable magneto-superelasticity of 5%. Additionally, a device utilizing a pulsed magnetic field was designed using this single crystal. With a pulse width of 10 ms, the device demonstrated a large stroke at room temperature, showcasing the potential for efficient energy transduction. The rapid response time of approximately 0.1 ms to an 8 ms pulse opens up possibilities for a wide range of practical applications.

The findings of this research study offer a promising strategy for enhancing the performance of functional materials through defect engineering. By leveraging the unique properties of ordered dislocations and martensitic variants, the development of giant magneto-superelasticity in single crystals represents a significant advancement in the field of materials science. Further exploration of this concept could lead to groundbreaking innovations in various industries.

Science

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