Excellent mechanical properties and large magnetocaloric effect of spark plasma sintered Ni-Mn-In-Co alloy

doi:10.1016/j.jmst.2020.10.011

Abstract

Abstract:

The Ni_43.75Mn_37.5In_12.5Co_6.25 alloy was obtained by using the spark plasma sintering (SPS) technique. The martensitic transformation, magnetic and mechanical properties of the SPS alloy were investigated. Key findings demonstrate that the martensitic transformation temperature of this alloy is about 10 K lower than that of the as-cast one. Both SPS and as-cast alloys show a 7 layered modulated martensite (7M) at room temperature. The compressive fracture strength and strain of the SPS alloy increase by 176.92% and 33.33% compared with the as-cast alloy, achieving 1440 MPa and 14%, respectively. The maximum magnetic entropy change ΔS_m is 17.1 J kg^-1 K^-1 for the SPS alloy at the magnetic field of 5 T.

Key words: Spark plasma sintering, Metamagnetic, shape memory alloy, Mechanical, property, Martensitic, transformation, Magnetocaloric effect

Jing Bai, Die Liu, Jianglong Gu, Xinjun Jiang, Xinzeng Liang, Ziqi Guan, Yudong Zhang, Claude Esling, Xiang Zhao, Liang Zuo. Excellent mechanical properties and large magnetocaloric effect of spark plasma sintered Ni-Mn-In-Co alloy[J]. J. Mater. Sci. Technol., 2021, 74: 46-51.

Figures/Tables 5

Fig. 1. (a) Microstructure of SPS Ni43.75Mn37.5In12.5Co6.25 alloy; DSC curves (b) and XRD patterns (c) of SPS and as-cast Ni-Mn-In-Co alloys; (d) Bright filed TEM image with inserted SAED pattern of SPS Ni-Mn-In-Co alloy.

Table 1 Martensitic transformation temperatures of sintered and as-cast Ni-Mn-In-Co alloys measured by DSC and PPMS under magnetic fields (H) of 0.5 and 5 T.

Sample	H (T)	M_s(K)	M_f(K)	A_s(K)	A_f(K)	T_A(K)	T_M(K)	T_C (K)	ΔM (A m² kg^-1)
As-cast alloy	0	335.3	308.4	335.1	359.7	348.7	319.9	418.8
	0.05	326.2	292.6	320.6	351.8	342.4	318.2		25.37
	5	303.0	271.3	300.4	332.2	315.8	295.0		96.96
SPS alloy	0	330.6	282.5	322.7	352.3	342.5	307.4	409.5
	0.05	325.8	265.7	312.7	342.0	333.3	305.2		25.72
	5	299.8	234.1	290.6	328.7	308.0	277.3		78.79

Fig. 2. (a) Compressive stress-strain curves of as-cast and SPS Ni-Mn-In-Co alloys at room temperature. Stress-strain data of referenced Ni-Mn based alloys are inserted, where C and PLS represent casting and pressureless sintering, respectively; (b) SEM image of fractured surface for SPS Ni-Mn-In-Co alloy.

Fig. 3. Dependence of magnetization on temperature for as-cast (a) and SPS (b) Ni-Mn-In-Co alloy under magnetic fields of 0.05 and 5 T with heating or cooling rates of 5 K/min. The inset shows curves of dM/dT vs T at 0.05 and 5 T.

Fig. 4. (a) M-H curves in temperature range of 300 K≤T≤350 K (ΔT = 5 K) and 150 K; (b) dependence of ΔSm on temperature with various magnetic fields for SPS Ni-Mn-In-Co alloy. (c) Maximum ΔSm at 5 T field as a function of temperature for present SPS Ni-Mn-In-Co alloy and other Ni-Mn based alloy.

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