Details

Autor(en) / Beteiligte

• Li, Dong
• Zhang, Xiaoliang
• Zhang, Guoyao
• Li, Zongbin
• Yang, Bo
• Yan, Haile
• Wang, Dunhui
• Zhao, Xiang
• Zuo, Liang

Titel

Enhancing the elastocaloric effect in Ni–Mn–Ga alloys through the coupling of magnetic transition and two-step structural transformation

Ist Teil von

• Applied physics letters, 2021-05, Vol.118 (21)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2021

Quelle

Scitation (American Institute of Physics)

Beschreibungen/Notizen

• Elastocaloric effect driven by uniaxial stress in the Ni–Mn–Ga alloys can be greatly enhanced through introducing magnetic transition or inter-martensitic transformation to martensitic transformation. Here, we present large elastocaloric effect in a ⟨0 0 1⟩A textured Ni55Mn19Ga25Ti1 polycrystalline alloy prepared by directional solidification by exploiting the coupled multiple phase transformations, i.e., paramagnetic-ferromagnetic transition, martensitic transformation, and inter-martensitic transformation. Owing to such magneto-multistructural transformation, the transformation entropy change related to the inverse transformation is enhanced to 29.6 J kg−1 K−1. Consequently, on unloading from a compressive stress of 180 MPa, a large adiabatic temperature change of −12.9 K and specific adiabatic temperature change of −72 K GPa−1 are achieved, being much superior over those in the Ni–Mn–Ga based alloys obtained previously.