Investigation into the Effect of Thermal Treatment on the Obtaining of Magnetic Phases: Fe5Y, Fe23B6, Y2Fe14B and αFe within the Amorphous Matrix of Rapidly-Quenched Fe61+xCo10−xW1Y8B20 Alloys (Where x = 0, 1 or 2)

The paper presents the results of research on the structure and magnetic properties of Fe61+xCo10−xW1Y8B20 alloys (where x = 0, 1 or 2). The alloys were produced using two production methods with similar cooling rates: Injection casting and suction casting. The alloy samples produced were subjected to isothermal annealing at 940 K for 10 min. The structure of the materials was examined using X-ray diffraction. Isothermal annealing has led to the formation of various crystallization products depending on the chemical composition of the alloy and the structure of the alloy in a solidified state. In two cases, the product of crystallization was the hard magnetic phase Y2Fe14B. However, the mechanism of this phase formation was different in both cases. The magnetic properties of alloys were tested using a vibrating sample magnetometer and a Faraday magnetic balance. It is found that the grain crystallite size of the crystalline phases have a decisive influence on the value of the coercive field (especially in the case of hard magnetic phases). It has been shown that privileged areas can already be created during the production process. Their presence determines the crystallization process.

Preparation of Magnetic Composites Based on Bulk Amorphous Iron Alloys

Iron-based amorphous alloys are characterized by so-called soft magnetic properties. Unfortunately, the geometry of iron-based amorphous materials significantly limits the applicability of these materials. One way to expand the use of these materials is to make composites based on them. As part of this work, rapid-cooled alloys were produced using the injection casting method. On their basis, magnetic composites with the addition of a non-magnetic binder were produced. The results of the structure (XRD) and magnetic properties (VSM) tests of the produced materials are presented. The research results have shown that the decisive impact on the magnetic properties of composites is the fact of the separation of magnetic particles with a non-magnetic binder. In this case, the influence of exchange interactions is dominated by dipole interactions.

Structural and Magnetic Relaxation of Fe61Co10Y8Mo1B20 Bulk Amorphous Alloy Obtained Using Two Methods

Bulk amorphous Fe61Co10Y8Mo1B20 alloys in the form of plates have been prepared using two methods: suction casting and injection casting. The structure of the as cast samples have been studied using Mossbauer spectroscopy. The obtained Mossbauer spectra are typical for materials of amorphous structure. In the hyperfine field distributions obtained from the Mossbauer spectra analysis, there are variations between the probability of occurrence of magnetic atoms around central atom. Then, magnetic susceptibility disaccommodation has been measured for the tested samples. These measurements indicate that the structural relaxation in the studied samples occur at the elementary level. Injection casting method for the tested alloy determines, in the material volume, the formation of more point relaxators in the form of free volume.

Corrosion Resistance of Injection-casting Dental Implants

In this paper the results of corrosion resistance for dentistry implants � commercial and produced by injection casting were presented. The produced and commercial implants were made from the same material (Ti6Al4V ELI). Studies were carried out on six samples: two were input materials (E1, E2), two were commercial implants (C1, C2) and two were produced implants (P1, P2) where P1 was produced from input material E1 and P2 was produced from input material E2. For corrosion resistance potentiodynamic studies were carried out. It was found that produced samples through injection casting have better corrosion resistance than commercial implants. However, produced implants have similar corrosion resistance to input materials. The studies have shown that it is possible to use innovative injection casting to improve corrosion resistance of dental implants.