Issue 19, 2018

Simultaneous tuning of martensitic transformation behavior, magnetic and mechanical properties in Ni–Mn–Sn magnetic alloy by Cu doping

Abstract

As typical multiferroic materials with a large magnetoelastic effect, which is based on giant caloric effects, Ni–Mn–Sn ferromagnetic shape memory alloys are regarded as potential environmentally friendly solid-state refrigeration materials. The significant brittleness of these alloys and their low martensitic transformation temperatures limit their practical applications. We propose a new means of performance tuning, which shows that replacing Sn by Cu in Ni47Mn38Sn15−xCux magnetic shape memory alloys can simultaneously tune their martensitic transformation behavior and magnetic and mechanical properties. When 6 at% Cu is added, a maximum compressive strength of 546 MPa with a fracture strain of up to 23.4% can be achieved at room temperature. The substitution of Cu for Sn also markedly increases the martensitic transformation temperature from 22.2 °C to 167.9 °C, which is crucial for actual applications. Moreover, using first-principles calculations, we clarify the effect of the substitution of Cu for Sn on the martensitic transformation behavior. On the basis of the above idea, we anticipated that a high-temperature magnetic shape memory alloy with excellent mechanical properties would be obtained by doping with Cu and another element simultaneously. This design method will solve a bottleneck in the development of high-temperature magnetic memory alloys.

Graphical abstract: Simultaneous tuning of martensitic transformation behavior, magnetic and mechanical properties in Ni–Mn–Sn magnetic alloy by Cu doping

Article information

Article type
Paper
Submitted
28 Nov 2017
Accepted
23 Apr 2018
First published
23 Apr 2018

J. Mater. Chem. C, 2018,6, 5228-5238

Simultaneous tuning of martensitic transformation behavior, magnetic and mechanical properties in Ni–Mn–Sn magnetic alloy by Cu doping

K. Zhang, C. Tan, E. Guo, Z. Feng, J. Zhu, Y. Tong and W. Cai, J. Mater. Chem. C, 2018, 6, 5228 DOI: 10.1039/C7TC05440H

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