Abstract
The phase relationships of the ternary Co-Ni-In system at 673 K and 873 K were investigated by means of powder X-ray diffraction, scanning electron microscopy equipped with energy dispersive spectroscopy, and optical microscopy. Though CoIn2 does not exist at 873 K, the ternary solid solution Co1−xNixIn2 exists at both 673 K and 873 K with different composition ranges. The Rietveld refinements were carried out to investigate the crystal structure of Co1−xNixIn2 (x = 0.540, and 0.580) and Ni2−xCoxIn3 (x = 0.200). The magnetization dependence of temperature (MT) curves of Ni2−xCoxIn3 (x = 0.200) and Co1−xNixIn2 (x = 0.540) are similar to those of the ferromagnetic shape memory alloys Ni-Mn-A (A = Ga, Sn, and In), but do not undergo martensitic transformation. The maximum magnetic entropy changes in Ni2−xCoxIn3 (x = 0.200) and Co1−xNixIn2 (x = 0.540) under 3T are 1.25 and 1.475 J kg−1K−1, respectively.
Highlights
Ni-Mn-In has drawn increasing attention due to its fascinating multifunctional properties including its shape memory effect [1], magnetocaloric effect [2], elastocaloric effect [3], magnetothermal conductivity [4], magnetic superelasticity [5], barocaloric effect [6], and large exchange bias effect [7]associated with the martensitic-type phase transformation
The phase analysis was performed on all the X-ray powder diffraction (XRD) data of the equilibrated Co-Ni-In samples with the aid of the Powder Diffraction File 2 (PDF2) database released by International Center for Diffraction Data (ICDD)
The diffraction patterns of those compounds absent in the PDF2 database were calculated from the crystallographic data available in references
Summary
Ni-Mn-In has drawn increasing attention due to its fascinating multifunctional properties including its shape memory effect [1], magnetocaloric effect [2], elastocaloric effect [3], magnetothermal conductivity [4], magnetic superelasticity [5], barocaloric effect [6], and large exchange bias effect [7]. A large number of researches have shown that the properties of the Ni-Mn-In alloys have been highly improved when accompanied with a small amount of Co doping into Ni-Mn-In ternary compounds [8,9,10]. Large magnetic field-induced martensitic transformation led to enormous recoverable deformation, which can be observed in Ni-Co-Mn-In alloys, making it an attractive shape memory functional material [19,20,21]. Co5 showed an almost perfect shape memory effect in which martensitic transformation played the dominant role, since the shape recovery was as high as 11.4% [22] With such excellent magnetocaloric and shape memory properties, they can extensively serve society. Phase diagrams are important for designing and preparing of Ni-Co-Mn-In alloys with potentially excellent properties They enable the exploration of new functional materials.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
