Microstructure, magnetic and mechanical properties of the bulk amorphous alloy Fe61Co10Ti4Y5B20

Abstract

This paper presents the results of the studies into the microstructure, the magnetic and mechanical properties of bulk amorphous alloy samples. The samples were produced in the form of rods, using the suction-casting method. The structure and microstructure of the prepared samples were examined using an X-ray diffractometer, a scanning electron microscope and a computer tomograph. The magnetic and mechanical properties were studied using a Lakeshore vibrating-sample magnetometer, a Zwick testing machine and a FutureTech microhardness tester. On the basis of the obtained results, it was found that, throughout their volumes, the investigated rods have an amorphous structure. Using computer tomography, three-dimensional images of the tested samples were reconstructed, enabling the imaging of the material defects occurring throughout the bulk volumes of the samples. Additionally, the tested Fe-based material should be included in the subset of the electrotechnical materials exhibiting good soft magnetic and mechanical properties. In view of their properties, these materials can be successfully used in energy-efficient transformers, replacing the conventional Fe-Si steel in this and other applications. Keywords: bulk amorphous alloys, electron scanning microscopy, computer tomography, saturation magnetization, coercivitŷ lanek predstavlja rezultate {tudija mikrostrukture, magnetnih in mehanskih lastnosti vzorcev masivne amorfne zlitine. Le-ti so bili izdelani v obliki palic z uporabo ulivanja z nasesavanjem. Struktura in mikrostruktura pripravljenih vzorcev je bila preiskovana z rentgenskim difraktometrom, z vrsti~nim elektronskim mikroskopom in z ra~unalni{kim tomografom. Magnetne in mehanske lastnosti so bile preiskovane z magnetometrom z vibrirajo~im vzorcem Lakeshore, s preizkusno napravo Zwick in z merilnikom mikrotrdote FutureTech. Dobljeni rezultati so pokazali, da imajo preiskovane palice po vsem volumnu amorfno strukturo. Z ra~unalni{ko tomografijo so bile pripravljene 3D-slike preiskovanih vzorcev, kar omogo~a ugotavljanje napak v materialu, ki se pojavljajo po vsem volumnu vzorca. Preizku{eni materiali na osnovi`eleza naj bi bili vklju~eni v podskupino materialov za elektrotehniko z dobrimi mehkomagnetnimi in mehanskimi lastnostmi. Glede na njihove lastnosti bi bili lahko ti materiali uspe{no uporabljeni za energijsko u~inkovite transformatorje, kjer bi nadomestili Fe-Si-jekla, in tudi na drugih podro~jih. Klju~ne besede: masivne amorfne zlitine, vrsti~na elektronska mikroskopija, ra~unalni{ka tomografija, nasi~enje magnetenja, koercitivnost

Structural Relaxation in the Amorphous Alloys: FeMeMoCrNbB (where Me = Ni or Co)

“…The larger value of this parameter for the alloy with added Co indicates a larger quantity of magnetic atoms and smaller distances between them. This means a higher packing density of magnetic atoms is present in this alloy [14,15]. This could be connected with the creation of CSRO.…”