Zhang Mingwei, Qu Guanda, Liu Jingshun, Pang Mengyao, Wang Xufeng, Liu Rui, Cao Guanyu, Ma Guoxi
School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China.
Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100022, China.
Materials (Basel). 2021 Jun 27;14(13):3589. doi: 10.3390/ma14133589.
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 , , and 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 is 1488 MPa. However, Fe-based microwires on macroscopic exhibit the brittle fracture feature, and the angle of sideview fracture 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.
在此，进一步系统研究了镍掺杂量对铁基金属微丝微观结构、磁性和力学性能的影响，以揭示镍掺杂对金属微丝微观结构和性能的影响机制。实验结果表明，旋转浸涂法制备的铁基微丝结构为非晶和纳米晶双相结构；丝材表面光滑、均匀且连续，无明显宏观和微观缺陷，具有良好的热稳定性；此外，丝材结构的有序度随镍掺杂量的增加而提高。同时，FeSiBNi2微丝比其他不同镍掺杂的微丝具有更好的软磁性能，其主要磁性能指标Ms、Mr、Hc和μ分别为174.06 emu/g、10.82 emu/g、33.08 Oe和0.43。适当的镍掺杂量可有效提高铁基微丝的抗拉强度，其中FeSiBNi3微丝的抗拉强度最大，达到2518 MPa。威布尔统计分析还表明，FeSiBNi2微丝的断裂可靠性更好，其断裂阈值σf为1488 MPa。然而，铁基微丝宏观上表现出脆性断裂特征，侧视断裂角θ随镍掺杂量的增加而减小，这也揭示了由于微丝结构中存在一定量的纳米晶而具有的一定塑性，侧视断裂中还包括大量的剪切带和横截面断裂中的少量熔滴。因此，镍掺杂铁基金属微丝因其独特的磁性能和力学性能，可作为功能集成材料应用于实际工程中。
