Directional solidification and elastocaloric effect in a Ni₄₅Mn₄₄Sn₁₁magnetic shape memory alloy

Abstract

In this work, the microstructural evolution, texture development and elastocaloric effect have been investigated in directionally solidified Heusler-type Ni45Mn44Sn11 alloys. A multi-phase structure is found in the as-grown sample, while only L21 phase exists after annealing. By employing the infrared thermography method, a significant average temperature change of −7.5 K is observed in the annealed Ni45Mn44Sn11 alloy with a highly oriented [2 2 0] texture. Also, the formation of cracks and its influence on the mechanical stability and elastocaloric cooling behavior have been studied.

Influence of Doping Tb on the Mechanical Properties and Martensitic Transformation of Ni-Mn-Sn Magnetic Shape Memory Alloys

“…Either based on the MCE or eCE, the materials 2 of 11 all show the largest potential to replace the traditional vapor-compression technologies due to the zero-production of ozone-depleting or greenhouse gases. Quite recently, a large temperature change of 4 K was found during compressing the sample of Ni 45 Mn 44 Sn 11 with a small transformation strain of 1.3% at 291.5 K [23]. All of these indicate that, as a typical multiferroic material with a large magnetoelastic effect or elastocaloric effect, Ni-Mn-Sn FSMAs are regarded as having potential for environmentally-friendly solid-state refrigeration materials.…”

All-d-Metal Full Heusler Alloys: A Novel Class of Functional Materials

“…This value is superior to many Ni–Mn based conventional Heusler systems such as Ni 1.80 Mn 1.76 Sn 0.44 (Δ T ad = −11.6 K unloading 600 MPa of uniaxial stress), Ni 2.0 Mn 1.11 Ga 0.89 (Δ T ad = −6.1 K unloading of 100 MPa of uniaxial stress), and Ni 1.82 Mn 1.46 In 0.53 Co 0.20 (Δ T ad = −3.5 K unloading 100 MPa of uniaxial stress). Moreover, the stress–strain curves showed a fracture resistance of 1.1 GPa, superior to other conventional full Heusler alloys such as Ni 1.80 Mn 1.76 Sn 0.44 (about 300 MPa) and Ni 2.06 Mn 1.32 In 0.62 (about 700 MPa) . Theoretical calculations also revealed that stoichiometric Ni 2 MnTi displays mechanical properties superior to those of conventional Heusler systems.…”

Characterization of caloric effects for magnetostructural transition materials: State-of-the-art and prospects

“…哈尔滨 工业大学张学习团队 [54] 利用电子背散射衍射技术结 合红外热成像仪的方法, 在同一Cu-Al-Mn薄带样品中 原位观测了不同取向晶粒的热效应. 红外热成像法具 有非接触、高精度、快速响应、空间分辨等优点, 不 仅可以给出样品在相变过程中具有空间分辨的温变, 还可以借此研究马氏体形核点 [50] 、裂纹萌生处 [55] 等 相变动力学问题. 此外, 红外热成像仪可以对薄膜、细 stathiou等人 [57] 在Ni-Fe-Ga单晶中通过DIC应变云图直 接观察到了多级马氏体相变行为, 并计算出不同总应 变下各类型马氏体所占的比例.…”