Abstract
Herein, the effect of Ni-doping amount on microstructure, magnetic and mechanical properties of Fe-based metallic microwires was systematically investigated further to reveal the influence mechanism of Ni-doping on the microstructure and properties of metallic microwires. Experimental results indicate that the rotated-dipping Fe-based microwires structure is an amorphous and nanocrystalline biphasic structure; the wire surface is smooth, uniform and continuous, without obvious macro- and micro-defects that have favorable thermal stability; and moreover, the degree of wire structure order increases with an increase in Ni-doping amount. Meanwhile, FeSiBNi2 microwires possess the better softly magnetic properties than the other wires with different Ni-doping, and their main magnetic performance indexes of Ms, Mr, Hc and μm are 174.06 emu/g, 10.82 emu/g, 33.08 Oe and 0.43, respectively. Appropriate Ni-doping amount can effectively improve the tensile strength of Fe-based microwires, and the tensile strength of FeSiBNi3 microwires is the largest of all, reaching 2518 MPa. Weibull statistical analysis also indicates that the fracture reliability of FeSiBNi2 microwires is much better and its fracture threshold value σu is 1488 MPa. However, Fe-based microwires on macroscopic exhibit the brittle fracture feature, and the angle of sideview fracture θ decreases as Ni-doping amount increases, which also reveals the certain plasticity due to a certain amount of nanocrystalline in the microwires structure, also including a huge amount of shear bands in the sideview fracture and a few molten drops in the cross-section fracture. Therefore, Ni-doped Fe-based metallic microwires can be used as the functional integrated materials in practical engineering application as for their unique magnetic and mechanical performances.
Highlights
Due to the highly localized deformation of metallic microwires and the uneven nucleation in the shear band, the brittleness tendency appears at room temperature, which limits its engineering applications to some extent [14,15]
We aim to study the effect of Ni-doping amount on microstructure, magnetic and tensile mechanical properties of Fe-based metallic microwires
Compared with the PDF standard card, a large number of α-Fe phase and a small number of Fe3 Si phase exist in the Fe-based metallic microwires, indicating that the Materials 2021, 14, x FOR PEER REVIEW
Summary
The atoms of amorphous alloys are arranged in a state of long-range disorder and short-range order, and the atoms are bonded by metallic bonds [1]. Under the similar composition condition, amorphous alloys have higher strength, elastic deformation capacity and relatively lower elastic modulus compared with crystalline alloys [2]. As a kind of quasi-one-dimensional metallic materials, microscale metallic microwires can show excellent properties in the fields of mechanics and magnetism [3] and can be used as magnetic sensitive materials [4,5], magnetostrictive materials [6,7], magnetic refrigeration materials [8,9], electromagnetic shielding materials [10,11], lead frame materials [12,13], etc. It is essential to improve the mechanical properties of metallic microwires
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