Martensitic transformation and magnetic behavior in Mn-rich Heusler MnNiIn shape memory alloys

2nd International Workshop on Materials Science and Mechanical Engineering

机械制造;材料科学

Bachagha, T.^1^2 ; Zhang, J.^1 ; Sunol, J.J.^3 ; Khitouni, M.^2

School of Computer Sciences and Technology, University of Qingdao, China^1

Laboratory of Inorganic Chemistry, UR-11-ES-73, University of Sfax, Tunisia^2

Dep. de Fisica, Universitat de Girona, Campus Montilivi, Girona

17071, Spain^3

关键词: Austenitic phase;    Characteristic temperature;    Different-magnetic fields;    Ferromagnetic transitions;    Heusler;    Magnetic behavior;    Martensite structures;    Melt-spinning techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/504/1/012009/pdf
DOI  :  10.1088/1757-899X/504/1/012009

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The present work is devoted to study the microstructure and magnetic behavior of Mn-rich Heusler MnNiIn alloys. The Mn-substituted alloys with Mn50Ni50-xInx (at.%) (x = 7.5 and 10) were prepared by melt-spinning technique. Experimental results show that the alloys crystallized into a monoclinic martensite structure 14M type, for the Mn50Ni42.5In7.5 alloy and L21 type cubic austenite structure for the Mn50Ni40In10 alloy. The characteristic temperatures decreased with the increase of In content under different magnetic fields: 50 Oe, 500 Oe, 5 kOe and 30 kOe. For the Mn50Ni42.5In7.5 alloy, the presence of a paramagnetic-ferromagnetic transition is noted. This transition in the austenitic phase occurs before the martensitic transformation during cooling. On the other side, for the Mn50Ni40In10 alloy, there is the presence of a martensitic transformation followed by a ferromagnetic transition. This transformation is carried out between a paramagnetic cubic austenite type and a ferromagnetic monoclinic martensite. This allows us to conclude that Indium addit ion plays a role to change the structure and magnetic behavior in MnNiIn alloys.