Thermal Stabilization of NiTiCuV Shape Memory Alloys: Observations During Elastocaloric Training

Schmidt, Marvin; Ullrich, Johannes; Wieczorek, André; Frenzel, Jan; Schütze, Andreas; Eggeler, Gunther; Seelecke, Stefan

doi:10.1007/s40830-015-0021-4

Cited by 76 publications

(59 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Within the framework of the Deutsche Forschungsgemeinschaft (DFG) priority program, various new results on fundamental material aspects, especially on phase transformation behavior, were obtained . These results supported the development of a new pseudoelastic SMA that exhibits superior properties for ferroic cooling . All key findings are presented here in brief.…”

Section: Current Activities In Spp 1599—from Materials Science To Engimentioning

confidence: 99%

See 1 more Smart Citation

NiTi‐Based Elastocaloric Cooling on the Macroscale: From Basic Concepts to Realization

et al. 2018

Self Cite

View full text Add to dashboard Cite

Solid‐state cooling is an environmentally friendly, no global warming potential alternative to vapor compression‐based systems. Elastocaloric cooling based on NiTi shape memory alloys exhibits excellent cooling capabilities. Due to the high specific latent heats activated by mechanical loading/unloading, large temperature changes can be generated in the material. The small required work input enables a high coefficient of performance. An overview of elastocaloric cooling from basic principles, such as elastocaloric cooling cycles, material characterization, modeling, and optimization, to the design of elastocaloric cooling devices is presented. Current work performed within the DFG (Deutsche Forschungsgemeinschaft) Priority Program SPP 1599 “Ferroic Cooling”, which is focused on the development and realization of a continuously operating elastocaloric cooling device, is highlighted. The cooling device operates in a rotatory mode with wires under tensile loading. The design allows maximization of cooling power by suitable wire diameter scaling as well as efficiency optimization by implementing a novel drive concept. Finally, computer‐aided design (CAD) models of the discussed solid‐state air cooling device are presented.

show abstract

Section: Current Activities In Spp 1599—from Materials Science To Engimentioning

confidence: 99%

“…This low hysteresis width predominately accounts for the high COP value of the NiTiCuV SMA. A detailed analysis of the cooling performance of the Ni 45 Ti 47.25 Cu 5 V 2.75 SMA material is available in the literature …”

Section: Current Activities In Spp 1599—from Materials Science To Engimentioning

confidence: 99%

NiTi‐Based Elastocaloric Cooling on the Macroscale: From Basic Concepts to Realization

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…This temperature change has a similar influence on the material stabilization, as do mechanical training cycles at various temperatures [12][13][14][15] . In addition to the well-known mechanical 13 and caloric 16 stabilization, a thermal material stabilization can be observed with the designed setup by applying thermography 17 .…”

Section: Materials Stabilizationmentioning

confidence: 99%

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Schmidt

Ullrich

Wieczorek

et al. 2016

JoVE

Self Cite

View full text Add to dashboard Cite

Shape Memory Alloys (SMA) using elastocaloric cooling processes have the potential to be an environmentally friendly alternative to the conventional vapor compression based cooling process. Nickel-Titanium (Ni-Ti) based alloy systems, especially, show large elastocaloric effects. Furthermore, exhibit large latent heats which is a necessary material property for the development of an efficient solid-state based cooling process. A scientific test rig has been designed to investigate these processes and the elastocaloric effects in SMAs. The realized test rig enables independent control of an SMA's mechanical loading and unloading cycles, as well as conductive heat transfer between SMA cooling elements and a heat source/sink. The test rig is equipped with a comprehensive monitoring system capable of synchronized measurements of mechanical and thermal parameters. In addition to determining the process-dependent mechanical work, the system also enables measurement of thermal caloric aspects of the elastocaloric cooling effect through use of a high-performance infrared camera. This combination is of particular interest, because it allows illustrations of localization and rate effects -both important for efficient heat transfer from the medium to be cooled.The work presented describes an experimental method to identify elastocaloric material properties in different materials and sample geometries. Furthermore, the test rig is used to investigate different cooling process variations. The introduced analysis methods enable a differentiated consideration of material, process and related boundary condition influences on the process efficiency. The comparison of the experimental data with the simulation results (of a thermomechanically coupled finite element model) allows for better understanding of the underlying physics of the elastocaloric effect. In addition, the experimental results, as well as the findings based on the simulation results, are used to improve the material properties.

show abstract

“…In addition, some new quaternary NiTi-based SMAs, which possess special properties, have been put forward as well. These new quaternary NiTi-based SMAs include NiTiHfPd SMA with high strength [23,24], TiNiCuPd SMA with near-zero hysteresis [25], and NiTiCuV SMA with high thermal stabilization [26]. However, only a few studies have reported the investigations of quaternary NiTi-based SMAs.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical Property, and Phase Transformation of Quaternary NiTiFeNb and NiTiFeTa Shape Memory Alloys

Liang

Jiang

Zhang

et al. 2017

Metals

View full text Add to dashboard Cite

Ta 1 (at %) SMAs are fabricated. The microstructure, mechanical property, and phase transformation of NiTiFeNb and NiTiFeTa SMAs are further investigated. Ti 2 Ni and β-Nb phases can be observed in NiTiFeNb SMA, whereas Ti 2 Ni and Ni 3 Ti phases can be captured in NiTiFeTa SMA. As compared to NiTiFe SMA, quaternary NiTiFeNb and NiTiFeTa SMAs possess the higher strength, since solution strengthening plays a considerable role. NiTiFeNb and NiTiFeTa SMAs exhibit a one-step transformation from B2 austenite to B19' martensite during cooling, but they experience a two-step transformation of B19'-R-B2 during heating.

show abstract

Thermal Stabilization of NiTiCuV Shape Memory Alloys: Observations During Elastocaloric Training

Cited by 76 publications

References 41 publications

NiTi‐Based Elastocaloric Cooling on the Macroscale: From Basic Concepts to Realization

NiTi‐Based Elastocaloric Cooling on the Macroscale: From Basic Concepts to Realization

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Microstructure, Mechanical Property, and Phase Transformation of Quaternary NiTiFeNb and NiTiFeTa Shape Memory Alloys

Contact Info

Product

Resources

About