Extremely stable stress-induced martensitic transformation at the nanoscale during superelastic cycling of Ni51Mn28Ga21 shape memory alloy

Gómez-Cortés, Jose F.; Czaja, Pawel; Nó, María L.; Szczerba, Maciej J.; San Juan, Jose M.

doi:10.1016/j.msea.2023.145339

Materials Science and Engineering: A

2023

DOI: 10.1016/j.msea.2023.145339

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Extremely stable stress-induced martensitic transformation at the nanoscale during superelastic cycling of Ni51Mn28Ga21 shape memory alloy

Jose F. Gómez-Cortés,

Pawel Czaja,

María L. Nó

et al.

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2024

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Cited by 6 publications

References 47 publications

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Ultrahigh Elastic Energy Storage in Nanocrystalline Alloys with Martensite Nanodomains

Dang,

Li,

Yang

et al. 2024

Advanced Materials

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Elastic materials that store and release elastic energy play pivotal roles in both macro and micro mechanical systems. Uniting high elastic energy density and efficiency is crucial for emerging technologies such as artificial muscles, hopping robots, and unmanned aerial vehicle catapults, yet it remains a significant challenge. Here, a nanocrystalline structure embedded with elliptical martensite nanodomains in ferroelastic alloys was utilized to enable high yield strength, large recoverable strain, and low energy dissipation simultaneously. As a result, the designed Ti–Ni–V alloys demonstrate ultrahigh energy density (>40 MJ m−3) with ultrahigh efficiency (>93%) and exceptional durability. This concept, which combines nano‐sized embryos to minimize energy dissipation of psuedo‐elasticity and employs a fine‐grained structure to enhance yield strength, can be applied to other ferroelastic materials. Furthermore, it holds promise for the development of phase transformation‐involved functionalities such as high‐performance dielectric energy storage, ultralow‐hysteresis magnetostrain, and high‐efficiency solid‐state caloric cooling.

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Ultrahigh Elastic Energy Storage in Nanocrystalline Alloys with Martensite Nanodomains

Dang,

Li,

Yang

et al. 2024

Advanced Materials

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Effect of Linear Velocity on Magneto-mechanical Properties of Ni-Mn-Ga-Based Melt-Spun Ribbons

Kowalska,

Czaja,

Rogal

et al. 2024

Metall Mater Trans A

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The study brings original data on the effect of linear velocity during melt-spinning process on magneto-mechanical properties of Heusler Ni-Mn-Ga-based melt-spun ribbons. The research revealed that different linear velocity of the copper wheel had a significant impact on the ribbon's geometry resulting in distinct changes in magneto-mechanical properties. X-ray diffraction measurements were used to examine the phase composition, confirming the presence of L21 austenite phase. To assess the mechanical properties of the Ni-Mn-Ga-based melt-spun ribbons, cyclic bending experiments were conducted at a strain rate of 0.1 mm/s. Additionally, experiments involving magnetic field-induced bending were carried out in an external magnetic field ranging from 0 to 0.28 T. Finally, it was observed that there was a proportional relationship between the linear velocity of the copper wheel and magnetic field-induced ribbons deflection. Conversely, the dependence between linear velocity and mechanical bending load was found to be inversely proportional. Electron backscattered diffraction measurements revealed that melt-spun ribbons produced at high linear velocity of 18.5 m/s exhibited fine-grained microstructure in contrast to low linear velocity of 3 m/s. Based on these results it seems feasible to optimize the functional properties of the studied ribbons by varying the linear velocity of the melt-spinning process.

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Anisotropy and Temperature Dependence of Annealing During Mechanical Bending in Ni-Mn-Ga-Based Melt-Spun Ribbons

Kowalska,

Czaja,

Czeppe

et al. 2024

J. of Materi Eng and Perform

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Mechanical response during bending experiments of Ni-Mn-Ga-Co-Cu melt-spun ribbons with the L21 austenite structure was studied. This material exhibited anisotropy in mechanical properties depending on the side to which the applied bending force was directed. When force was applied to the “free side,” a substantial load drop was observed in the initial stage of bending. On the other hand, no load drop anomalies were observed when force was applied to the “wheel side.” Additionally, mechanical training effects were assessed by applying up to 10 bending cycles. It was demonstrated that with an increase in the number of bending cycles, there was no significant decrease in bending force, and the load–displacement curve remained unaltered. The temperature dependence of annealing of the ribbons' mechanical properties was also examined. The Ni-Mn-Ga-Co-Cu melt-spun ribbons were annealed at 373 K, 573 K, 773 K, 973 K, and 1173 K for 30 min, followed by subsequent bending tests. Annealing influenced bending response through two major phenomena detected. The first was associated with crystal structure ordering and recovery; while, the second was attributed to grain growth. Changes in mechanical properties influenced by different annealing temperatures were correlated with alterations in the microstructure of the studied ribbons.

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Extremely stable stress-induced martensitic transformation at the nanoscale during superelastic cycling of Ni51Mn28Ga21 shape memory alloy

Cited by 6 publications

References 47 publications

Ultrahigh Elastic Energy Storage in Nanocrystalline Alloys with Martensite Nanodomains

Ultrahigh Elastic Energy Storage in Nanocrystalline Alloys with Martensite Nanodomains

Effect of Linear Velocity on Magneto-mechanical Properties of Ni-Mn-Ga-Based Melt-Spun Ribbons

Anisotropy and Temperature Dependence of Annealing During Mechanical Bending in Ni-Mn-Ga-Based Melt-Spun Ribbons

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