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Combinatorial materials science 1

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Ni–Ti–Cu–V alloys 1

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cooled seat 1

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A hot future for cool materials

Frontiers in Energy 2023, Volume 17, Issue 4, Pages 447-449 doi: 10.1007/s11708-022-0854-4

Abstract: The widespread need to pump heat necessitates improvements that will increase energy efficiency and, more generally, reduce environmental impact. As discussed at the recent Calorics 2022 Conference, heat-pump devices based on caloric materials offer an intriguing alternative to gas combustion and vapor compression.

Keywords： magnetocaloric electrocaloric mechanocaloric elastocaloric barocaloric

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A fully solid-state cold thermal energy storage device for car seats using shape-memory alloys

Frontiers in Energy 2023, Volume 17, Issue 4, Pages 504-515 doi: 10.1007/s11708-022-0855-3

Abstract: The influence of initial temperature, elastocaloric materials, and the shape-memory alloy geometry scheme

Keywords： shape-memory alloy (SMA) elastocaloric effect (eCE) cooled seat cold thermal energy storage

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Combinatorial Synthesis and High-Throughput Characterization of Microstructure and Phase Transformation in Ni–Ti–Cu–V Quaternary Thin-Film Library Article

Naila M. Al Hasan, Huilong Hou, Suchismita Sarkar, Sigurd Thienhaus, Apurva Mehta, Alfred Ludwig, Ichiro Takeuchi

Engineering 2020, Volume 6, Issue 6, Pages 637-643 doi: 10.1016/j.eng.2020.05.003

Abstract:

Ni–Ti–based shape memory alloys (SMAs) have found widespread use in the last 70 years, but improving their functional stability remains a key quest for more robust and advanced applications. Named for their ability to retain their processed shape as a result of a reversible martensitic transformation, SMAs are highly sensitive to compositional variations. Alloying with ternary and quaternary elements to finetune the lattice parameters and the thermal hysteresis of an SMA, therefore, becomes a challenge in materials exploration. Combinatorial materials science allows streamlining of the synthesis process and data management from multiple characterization techniques. In this study, a composition spread of Ni–Ti–Cu–V thin-film library was synthesized by magnetron co-sputtering on a thermally oxidized Si wafer. Composition-dependent phase transformation temperature and microstructure were investigated and determined using high-throughput wavelength dispersive spectroscopy, synchrotron X-ray diffraction, and temperature-dependent resistance measurements. Of the 177 compositions in the materials library, 32 were observed to have shape memory effect, of which five had zero or near-zero thermal hysteresis. These compositions provide flexibility in the operating temperature regimes that they can be used in. A phase map for the quaternary system and correlations of functional properties are discussed with respect to the local microstructure and composition of the thin-film library.

Keywords： alloys Combinatorial materials science Quaternary alloys Shape memory alloys Thin-film library Elastocaloric