Large room-temperature elastocaloric effect in a bulk polycrystalline Ni-Ti-Cu-Co alloy with low isothermal stress hysteresis

Large Elastocaloric Effect in Fe‐Doped Co–Fe–V–Ga Shape Memory Alloys

“…As seen from Table 1, the A f value of Fe0.3 was slightly lower than 300 K, which was conducive for achieving a large eCE at room temperature. [3] Figure 1b displays the M-T curves of the Fe0.3 alloy under the magnetic fields of 0.01 and 3 T. Under a magnetic field of 0.01 T, the characteristic temperatures (M s , M f , A s , and A f ) were found to be 284.6, 273.3, 276.8, and 287.4 K, respectively. In turn, the MT temperatures under a 3 T magnetic field remained almost constant, which could be attributed to the tiny value of ΔM around the MT in the Fe0.3 alloy.…”

“…of ΔT hys of the Fe0.3 alloy and some well-studied elastocaloric alloys, obtained from the DSC measurements. [1,3,6,15,[42][43][44][45][46][47][48][49][50][51][52][53] Among various elastocaloric materials, the Fe0.3 alloy exhibited a relatively small value of ΔT hys , which was conducive to excellent cyclic stability. [54] Figure 3 displays the XRD patterns of Co 51Àx Fe x V 34 Ga 15 (x ¼ 0, 0.3, and 0.6) alloys.…”

“…However, conventional refrigeration systems relying on vapor compressors invariably cause environmental problems (e.g., greenhouse effect and ozonosphere hole). [1][2][3][4][5] Therefore, numerous studies have been conducted to develop a new solid-state refrigeration technology free of the aforementioned shortcomings. [3,6,7] According to different external fields, the thermal effects from the modified solid refrigeration systems were attributed to the magnetocaloric effect (magnetic field), electrocaloric effect (electric field), barocaloric effect (hydrostatic pressure field), and elastocaloric effect (eCE) (uniaxial stress field).…”

“…[1][2][3][4][5] Therefore, numerous studies have been conducted to develop a new solid-state refrigeration technology free of the aforementioned shortcomings. [3,6,7] According to different external fields, the thermal effects from the modified solid refrigeration systems were attributed to the magnetocaloric effect (magnetic field), electrocaloric effect (electric field), barocaloric effect (hydrostatic pressure field), and elastocaloric effect (eCE) (uniaxial stress field). [2,[8][9][10] The eCE utilizes the phase transformation latent heat when external uniaxial stress is rapidly applied or removed to realize heating or refrigeration.…”

“…[11][12][13][14] This enables one to achieve up to %75% of the energy efficiencies in solid-state cooling, making it one of the most promising non-vapor compression cooling technologies according to the US Department of Energy. [3,7,[15][16][17] The core problem of refrigeration systems is the appropriate choice of refrigerant. In this respect, special attention has been paid to the extensive investigation of elastocaloric materials for advanced solid refrigeration technology.…”