Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Phase transformation and mechanical properties of Ni-Co-Mn-In ferromagnetic shape memory alloys containing γ-phase particles

nr katalogowy: 79734

In recent years the Ni-Mn-X (X = Sn, In, Co + In) ferromagnetic shape memory alloys (FSMA) have attracted attention of the scientific world [1]. The alloys undergo first order revisable phase transformation from high to low temperature phase known as austenite and martensite. Depending on the chemical composition and thermal treatment, the austenite has structure of the B2 or L21 parent phase in these alloys, while for martensite the modulated structures have been usually reported [2]. This makes them exhibit many interesting physical properties, such as magneto-resistance, magneto-caloric effect and magnetic shape memory effect (MSME). Therefore, the alloys are promising candidates for magneto-mechanical actuators, connectors in clamps or brakes. Unfortunately, the restrictions of low Curie point and their brittleness limit the practical applications of the FSMA [3]. In order to improve the plastic properties and ductillity, the existence of the second phase particles is desirable in the alloy. Y. Feng et al. [4] have studied the influence of cobalt addition on structure, phase transformation and mechanical properties of Ni50Mn34In16-xCox. The results showed that the γ-phase appeared with the amount more than 3 at. % of cobalt. The existence of the large amount of γ-phase particles was in favour of the ductility of the studied alloys. W. Maziarz [5] have studied the Co-Ni-Al alloys containing from 0 to 23% of γ-phase particles. The author [5] reported that the alloys containing primary particles have better mechanical properties, as compression strength or maximal strain, which are closely connected with the γ-phase existence. In this paper, the report on effect of γ-phase particles on structure, physical parameters and properties of the Ni-Co-Mn-In ferromagnetic shape memory alloys is presented. The structure, martensitic transformation temperatures, Curie point, elastic constant and hardness were ex[...]

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