Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 3

Microstructure evolution and its influence on martensitic transformation in Ni-Mn-Sn alloys

nr katalogowy: 78022

Magnetic shape memory alloys (MSMA) have received considerable attention owing to their outstanding magnetoelastic and magnetocaloric properties [1?€3]. Among various MSMA the Heusler Ni-Mn-Sn alloy system has been identified as a promising alternative to the most widely studied Ni-Mn-Ga alloy, whose applications are limited by high Ga cost, poor ductility and low martensitic transformation temperature (Ms) [4, 5]. Ni-Mn-Sn is an off-stoichiometric intermetallic compound featuring L21 Heusler structure in the high temperature austenite phase. It may undergo temperature, stress or magnetic field induced martensitic transition to a lower temperature modulated martensite phase [6]. The magnetic field provoked behaviour is in this case similar to the usual shape memory effect occurring due to the heat induced reverse transformation, and therefore it is termed metamagnetic transition as opposed to Ni-Mn- Ga, which transforms from austenite to martensite in the presence of a sufficiently high magnetic field. The coupling between magnetism and structure observed in these alloys entails that the magnetic field can induce not only an entropy change of magnetic contribution (?˘SM) but also a supplementary fraction related to the latent heat associated with the structural transformation (?˘SS ). Entropy changes up to 10.4 J/kgK at 10 kOe has been reported for Ni-Mn- Sn alloy system [7]. Increased entropy changes may be utilized for magnetic refrigeration, which is of fundamental importance from the environmental point o view. The Ms and TC of the martensite phase are found to be strongly dependant on composition whereas TC of austenite is less sensitive to it [8]. The phase transition temperature dependence on composition is mainly attributed to the change in valence electron concentration (determined as the number of 3d and 4s electrons of Ni and Mn and the number of 5s and 5p electrons of Sn and expressed in terms of electron to [...]

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