Work

Boosting Caloric Performances of Ni-Co-Mn-Ti Shape Memory Alloy for Multi-Scenario Refrigeration by Spark Plasma Sintering

Year: 2025

Type: article

Abstract: In this study, Ni37Co13Mn33.5+xTi16.5–x alloys with different particle sizes (75–150 μm, 50–75 μm, 0–50 μm) were successfully fabricated using spark plasma sintering under different processing conditions. By adjusting the composition of alloy and particle size, a significant transformation entropy change and the generation of a suitable amount of second phases along the grain boundaries were achieved in the SPS Ni37Co13Mn34.5Ti15.5 alloy with a particle size range of 0–50 μm. The mechanical properties of this optimized alloy were excellent, exhibiting a compressive strength of 2005 MPa and a fracture strain of 27%. Furthermore, under a loading rate of 0.28 s−1, the alloy demonstrated an adiabatic temperature change of up to 34.2 K. In addition, the alloy also exhibited a barocaloric effect under low-pressure conditions, achieving a substantial entropy change of 16.1 J·kg−1·K−1 and an estimated adiabatic temperature change of 11.2 K under 100 MPa pressure. Through these results, SPS Ni37Co13Mn34.5Ti15.5 alloy is proved to be a potential candidate for solid-state refrigeration applications.

Source: Materials

DOI: 10.3390/ma18204691

Authors: Hongyuan Tang, Ziqi Guan, Yanze Wu, Zhenzhuang Li, Jiaqi Liu, Xing Lu

Institutions: Dalian Jiaotong University, Chinese Academy of Sciences, Institute of Metal Research, Shenyang National Laboratory for Materials Science

Language: English

Topic: Shape Memory Alloy Transformations

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,137

Funders: National Natural Science Foundation of China, China Postdoctoral Science Foundation, Natural Science Foundation of Liaoning Province