Low-Fatigue and Large Room-Temperature Elastocaloric Effect in a Bulk Ti _49.2Ni _40.8Cu ₁₀ Alloy

Long-Term Stable Elastocaloric Effect in a Heusler-Type Co51V33Ga16 Polycrystalline Alloy

“…Figure compares the Δ T ad values and the cycle numbers during the cyclic test between the present alloy and some other elastocaloric materials reported in the literature. ,,,,,,,,− The corresponding degradation rates of Δ T ad values for the cyclic tests are also summarized in Table . It is clear that the present Co 51 V 33 Ga 16 alloy exhibits the longest fatigue life as well as the considerable Δ T ad among these elastocaloric materials apart from NiTi-based alloys.…”

“…Besides, the degradation rate of Δ T ad (2.0 × 10 –5 K per cycle) for the present alloy is at least 1 order of magnitude lower than those in Heusler-type alloys ,,,,,,, and Cu-based alloys, ,, demonstrating a much better cyclability of elastocaloric effect. As for NiTi-based alloys, these alloys generally possess excellent fatigue life and some of them even can withstand more than 10 6 mechanical cycles. , Meanwhile, the degradation rate of Δ T ad can be as low as 10 –4 –10 –7 K per cycle by controlling the crystallographic orientation, grain size, and precipitation . However, the complicated preparation process of NiTi-based alloys, such as thermomechanical treatment and additive manufacturing, renders more time consumption and energy usage as compared with the arc-melting technology used in this work.…”

“…Comparison on Δ T ad and number of cycles between the present alloy and some other elastocaloric materials, including NiMn-based alloys, ,, NiFeGa-based alloys, ,, CoVGa-based alloys, , Cu-based alloys, ,, and NiTi-based alloys. − …”

“…As for NiTi-based alloys, these alloys generally possess excellent fatigue life and some of them even can withstand more than 10 6 mechanical cycles. 66,68 Meanwhile, the degradation rate of ΔT ad can be as low as 10 −4 −10 −7 K per cycle by controlling the crystallographic orientation, 63 grain size, 67 and precipitation. 67 However, the complicated preparation process of NiTi-based alloys, such as thermomechanical treatment and additive manufacturing, renders more time consumption and energy usage as compared with the arcmelting technology used in this work.…”

“…66,68 Meanwhile, the degradation rate of ΔT ad can be as low as 10 −4 −10 −7 K per cycle by controlling the crystallographic orientation, 63 grain size, 67 and precipitation. 67 However, the complicated preparation process of NiTi-based alloys, such as thermomechanical treatment and additive manufacturing, renders more time consumption and energy usage as compared with the arcmelting technology used in this work. In addition, the required stress to achieve giant elastocaloric response for NiTi-based alloys is generally above 600 MPa, 39,69 being much higher than that of the present Co 51 V 33 Ga 16 alloy (∼300 MPa).…”