Wen Sun, Hanyang Qian, Qi Fu, Mingxiao Zhang, Juan Cheng, Zhaojun Mo, Jian Liu, Wei Li, Guowei Li
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引用次数: 0
Abstract
Ni–Mn–Sn metamagnetic shape memory alloys have garnered significant attention in solid-state refrigeration due to their highly tunable magnetic properties and large elastocaloric effects. However, their intrinsic brittleness hinders practical application. Laser powder bed fusion (L-PBF) additive manufacturing technology can overcome the machining difficulties of brittle alloys, enabling freeform geometrical design. Meanwhile, the rapidly cooled melt pool also facilitates the attainment of austenite functional phases. However, the elastocaloric effect of L-PBF alloys, especially for directly printed bulk materials without heat treatment, has not been systematically studied in Ni–Mn-based alloys. This work successfully obtained a rapidly solidified microstructure with austenite phases in Ni45Mn44Sn11 alloys using a one-step L-PBF method without heat treatment. The relative densities of the L-PBF samples reached a maximum of 98.20%, with the entropy change values remaining stable in the range of 26 to 31 J kg−1 K−1. Compared to compression along the building direction, impressive and larger elastocaloric temperature changes (6.7 K) were achieved when compressing along the scanning direction due to the dominance of columnar grains and micron-sized defects. A maximum entropy change of 4.8 J kg−1 K−1 is achieved under an external magnetic change of 5 T. This work offers a simplified method for rapidly constructing solid-state refrigeration alloys with a large elastocaloric effect.
期刊介绍:
The Journal of Materials Chemistry is divided into three distinct sections, A, B, and C, each catering to specific applications of the materials under study:
Journal of Materials Chemistry A focuses primarily on materials intended for applications in energy and sustainability.
Journal of Materials Chemistry B specializes in materials designed for applications in biology and medicine.
Journal of Materials Chemistry C is dedicated to materials suitable for applications in optical, magnetic, and electronic devices.
Example topic areas within the scope of Journal of Materials Chemistry C are listed below. This list is neither exhaustive nor exclusive.
Bioelectronics
Conductors
Detectors
Dielectrics
Displays
Ferroelectrics
Lasers
LEDs
Lighting
Liquid crystals
Memory
Metamaterials
Multiferroics
Photonics
Photovoltaics
Semiconductors
Sensors
Single molecule conductors
Spintronics
Superconductors
Thermoelectrics
Topological insulators
Transistors