Large and reversible elastocaloric effect in dual-phase Ni54Fe19Ga27 superelastic alloys

Abstract

In this work, we report elastocaloric effect (eCE) in Ni-Fe-Ga polycrystalline alloys. By application of a uniaxial compressive stress of 170 MPa at 298 K, a large and recoverable temperature change of 4 K has been obtained in precipitates-containing Ni54Fe19Ga27 alloys. The degradation of eCE is insensitive to 100 loading-unloading cycles. In comparison, the loss of mechanical integrity occurs in the single-phase alloy suffering from only 10 superelastic cycles, implying a short fatigue life. Good mechanical properties, large and equivalent adiabatic temperature change (ΔT) under loading-unloading cycle render dual-phase Ni-Fe-Ga promising candidate materials for solid-state mechanical cooling application at ambient conditions.

Magnetocaloric and Elastocaloric Effects in All‐d‐Metal Ni37Co9Fe4Mn35Ti15 Magnetic Shape Memory Alloy

“…The relationship between ΔS m pk and the magnetic field is almost linear. The similar near-linear relationship is also observed in Ni 40 Co 10Àx Mn 33 Al 17 alloys and Ni 1.7 Co 0.3 Mn 1þx Al 1Àx alloys. [21,34] Another critical parameter to assess the efficiency of magnetic refrigeration is the refrigeration capacity (RC), which is usually determined by integrating the curve of ΔS m -T over the full width at half maximum.…”

“…The reversibility and stability of eC effect are vital to reliable eC‐based cooling machines . Thus, the reversibility test was investigated by recording the Δ T during 30 loading–unloading cycles.…”

“…[8] The reversibility and stability of eC effect are vital to reliable eC-based cooling machines. [40] Thus, the reversibility test was investigated by recording the ΔT during 30 loading-unloading cycles. For each cycle, the compression stress reached 300 MPa in the loading process and holding for 80 s, then unloaded to 0 MPa followed by holding for 80 s. Figure 5a,b shows typical ΔT versus time and ΔT versus cycle number profiles, respectively.…”

Elastocaloric effect in Ni50Fe19Ga27Co4 single crystals

“…Large ($12%) and successive (L2 1 -10M-14M-L1 0 ) superelastic behaviors were reported in a Ni 54 Ga 27 Fe 19 (at.%) single crystal [14]. Wide temperature window (300-900 K) for stress-induced MT has been observed in a Ni 49 Ga 27 Fe 18 Co 6 (at.%) single crystal [15], making it become a promising http 19 polycrystalline alloy has been reported [16]. However, this effect has not been reported in Ni-Fe-Ga-based single crystals.…”

Giant elastocaloric effect covering wide temperature range in columnar-grained Cu71.5Al17.5Mn11 shape memory alloy

“…4(a) shows the stress-strain curves upon loading at different testing temperatures of the as-aged sample and it is important to note that the large ∆T exp was achieved at considerably low applying stresses. For example, the critical stress for inducing martensitic transformation was 83 MPa at 315 K in the as-aged sample, the maximum stress σ max was 127 MPa, and the corresponding specific elastocaloric ability ∆T exp /σ max was then calculated to be 100.8 K/GPa, which is much higher than that of 22.7 K/GPa in Ni-Ti 7 and other elastocaloric alloys, 8,10,11,18,21,[23][24][25][26][27] as shown in Fig. 4(b).…”