Enhanced magnetocaloric effect in Heusler Ni–Mn–Sn unidirectional crystal

Ren, Jian; Li, Hongwei; Yu, Jinke; Feng, Shini; Zhai, Qijie; Fu, Jianxun; Luo, Zhiping; Zheng, Hongxing

doi:10.1016/j.jallcom.2015.02.090

Cited by 21 publications

(7 citation statements)

References 26 publications

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“…Thus the RC eff is 94 Jkg -1 . It is 14 much higher than Ni 49 Mn 39 Sn 12 (58 Jkg -1 ) [17] and Mn 50 Ni 40 In 10…”

Section: Experimental Procedures 19mentioning

confidence: 86%

“…Considering that in Ni-Mn-Z Heusler alloys the structural transition 9 temperatures are highly sensitive to small composition changes the attainment of successive 10 martensitic transformations can be obtained by creating chemical segregation or composition 11 gradient. Segregations typically occur with directional solidification, most prominently in the 12 growth of unidirectional [17] crystal or single crystal [18,19]. 13…”

Section: Introductionmentioning

confidence: 99%

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The effect of step-like martensitic transformation on the magnetic entropy change of Ni40.6Co8.5Mn40.9Sn10 unidirectional crystal grown with the Bridgman-Stockbarger technique

Chen

Tong

et al. 2017

Journal of Alloys and Compounds

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“…Thus the RC eff is 94 Jkg -1 . It is 14 much higher than Ni 49 Mn 39 Sn 12 (58 Jkg -1 ) [17] and Mn 50 Ni 40 In 10…”

Section: Experimental Procedures 19mentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

The effect of step-like martensitic transformation on the magnetic entropy change of Ni40.6Co8.5Mn40.9Sn10 unidirectional crystal grown with the Bridgman-Stockbarger technique

Chen

Tong

et al. 2017

Journal of Alloys and Compounds

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“…Hernando et al reported the RC total reached~148 J/kg in Mn 50 Ni 40 In 10 melt-spun ribbons under a magnetic field change of 30 kOe [31], which was higher than most of reported values in Heusler NieMn based materials, for example, Ni 50 Mn 37 Sn 13 (~82 J/kg, 30 kOe) [22] and Ni 49 Mn 39 Sn 12 (~127 J/kg, 30 kOe) [32]. In the present work, a Mn-rich Heusler Mn 50 Ni 40 In 10 unidirectional crystal was produced using a modified high-pressure optical zone-melting furnace to investigate its magnetocaloric effect.…”

Section: Introductionmentioning

confidence: 83%

“…The temperature of the molten zone was estimated to bẽ 1200 K. The pulling rate of 14 mm/h and rotation rate of 15 rpm were kept at constants during the growth process. More experimental details on the crystal growth have been described elsewhere [32,33].…”

Section: Methodsmentioning

confidence: 99%

Giant magnetocaloric effect in a Heusler Mn 50 Ni 40 In 10 unidirectional crystal

Ren

Feng

et al. 2015

Intermetallics

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“…As in any other engineering task, a requirements analysis at the beginning of the design process is essential. Respective to the state of the art of established fastswitching pneumatic valves, the following requirements were specified as targets: a minimal response time under 1 ms, a minimal modular dimension under 9 mm and a nominal volume flow of at least 100 Nl/min at a maximum supply voltage of 48 V. Moreover, a high duty cycle, and therefore, a thermal resistance of the MSM-based actuator is important, which is mostly challenging in the design process, because the MSM alloys tend to lose their effect at temperatures between 60 and 80°C [7]. Many possible operating principles of MSM alloys [8] result in a large number of valve concepts.…”

Section: Msm Materials and Design Processmentioning

confidence: 99%

A Design Approach for a Valve Based on a Magnetic Shape Memory Actuator

Effner

Zawada

Weber

2020

Shap. Mem. Superelasticity

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With the motivation to meet the increasing requirements on fast-switching pneumatic valves, Magnetic Shape Memory alloys (MSM) are considered as a promising alternative to conventional actuators. Regarding the desired strokes, forces and actuation frequencies MSM alloys meet the requirements best among other solid-state transducers for valve applications. However, the hysteresis in the magneto-mechanical behavior is challenging during the sizing process of a component based on an MSM actuator. It has proved to be valuable to apply a system simulation including a lumped element model of the MSM element in the early design phase. In this contribution, a design approach for the valve based on an MSM actuator is shown. A system network model was used to design a functional prototype of the valve to achieve the specifications defined within a requirements analysis. These specifications were derived from characteristic features of conventional established fast-switching pneumatic valve. The analysis of the subsystems was done to exploit the deviations and their influences on the system behavior. Furthermore, the experimental research of the functional prototype of the valve was carried out to check for functionality and to evaluate whether the specifications were met. A nominal volume flow of 120 Nl/min was reached at a supply Voltage U of 48 V and current i of 7:6 A which exceeds the aim of 100 Nl/min. By means of an optimization of the actuators geometry the response time could be reduced to less than 1 ms. The desired maximum modular dimension of 9 mm was not achieved by the functional prototype due to the available production process, but would be feasible with series production. Keywords Magnetic shape memory Á Mechanical behavior Á NiMaGa Á Pneumatic valve Á Fast switching Á MSM actuator This article is an invited submission to Shape Memory and Superelasticity selected from presentations at the International Conference on Ferromagnetic Shape Memory Alloys (ICFSMA) held June 2-7, 2019 in Prague, Czech Republic, and has been expanded from the original presentation.

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Enhanced magnetocaloric effect in Heusler Ni–Mn–Sn unidirectional crystal

Cited by 21 publications

References 26 publications

The effect of step-like martensitic transformation on the magnetic entropy change of Ni40.6Co8.5Mn40.9Sn10 unidirectional crystal grown with the Bridgman-Stockbarger technique

The effect of step-like martensitic transformation on the magnetic entropy change of Ni40.6Co8.5Mn40.9Sn10 unidirectional crystal grown with the Bridgman-Stockbarger technique

Giant magnetocaloric effect in a Heusler Mn 50 Ni 40 In 10 unidirectional crystal

A Design Approach for a Valve Based on a Magnetic Shape Memory Actuator

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