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

Abstract

The magnetocaloric effect and the elastocaloric effect in a polycrystalline all‐d‐metal Ni37Co9Fe4Mn35Ti15 magnetic shape memory alloy are investigated. The alloy undergoes a transition from ferromagnetic austenite to weak‐magnetic martensite near room temperature. It exhibits a maximum magnetic entropy change of 8.4 J Kg−1 K−1 under the magnetic field of 3 T. Moreover, a maximum temperature change of 6.3 K associated martensite transition is obtained at room temperature by loading the uniaxial stress of 400 MPa. These results suggest that the alloy is the promising candidate for new solid‐state refrigeration materials.

Tailored martensitic transformation and enhanced magnetocaloric effect in all-d-metal Ni35Co15Mn33Fe2Ti15 alloy ribbons

“…The exciting enhancement of ∆S m can be achieved for S45 as optimal value among three wheel speeds, which is more than twice compared to S15. The optimal values of ∆S m for S45 (Table 2) are 15.6 (39.7) J/kg•K with ∆H = (20) 50 kOe and comparable with and even larger than that of reported typical magnetocaloric materials, such as 17.6 J/kg•K for Ni 36.3 Co 13.7 Mn 35 Ti 15 , [26] 14 J/kg•K for Gd 5 (Si 2 Ge 2 ), [52] 14.3 J/kg•K for LaFe 11.4 Si 1.6 , [53] 15.9 J/kg•K for Ni 35 Ni 37 Co 9 Fe 4 Mn 35 Ti 15 , [54] and 15 J/kg•K for Mn 0.8 Co 0.2 NiGe 0.75 Si 0.25 [55] with ∆H = 20 kOe; and 18 J/kg•K for Ni 35 Co 15 Mn 35 Ti 15 , [24] and 28 J/kg•K for Ni 35 Cu 2.5 Co 12.5 Mn 35 Ti 15 [42] with ∆H = 50 kOe. In Fig.…”

Enhanced magnetocaloric performances and tunable martensitic transformation in Ni35Co15Mn35−xFexTi15 all-d-metal Heusler alloys by chemical and physical pressures

“…Recently, a new material system with MSTs, named all-dmetal Heusler alloys, was established by modifying the p-d hybridization in the NiMn-based Heusler alloys to d-d hybridization by transition-metal elements with low valenceelectrons. Various interesting physical properties and potential applications have also been realized very recently [19][20][21][22][23][24][25][26][27][28]. Strong ferromagnetic (FM) coupling and MST were established by introducing Co element in Mn-Ni-Ti [19][20][21].…”

“…A large lowmagnetic-field magnetic entropy change (ΔS M ) was observed in Ni 37 Cu 2.5 Co 12.5 Mn 35 Ti 15 ribbon [24]. Ni 37 Co 9 Fe 4 Mn 35 Ti 15 alloy gained maximum ΔT ad of 6.3 K under a uniaxial stress of 400 MPa [25]. Meanwhile, the first principle calculations were also used to predict the stability of phase, possible martensitic transformation (MT), and electronic behaviors [29][30][31][32] for other similar alloys in all-d-metal Heusler systems.…”