Preparation of Ti–Ni–Fe phase by levitation and its structural characterisation

Abstract

This paper presents results concerning the electromagnetic levitation of solid metal samples. It describes the levitation system and some coils designed to melt 10 g metal samples under controlled atmosphere, as well as melting the process. The main advantage of the method is the absence of any type of crucible and owing to this, the effect of side reaction can be avoided, resulting from the influence of the active metal on the walls of the ceramic crucible in the physicochemical investigations. In many cases, the side reaction makes the correct interpretation of the experimental results sometimes difficult and/or impossible. In order to describe the crystallisation process and the change in the microstructure of the samples obtained during electromagnetic melting at the intermetallic Fe–Ni–Ti phase, a scanning electron microscopy analysis and an X-ray diffraction analysis were used.

Activity of bismuth in liquid Ag-Bi-Ni alloys determined by equilibrium saturation method

“…Since the vapor pressure o f Bi is much higher than vapor pressure o f other elements (at T=1173K: p*A = S . 2 [16] in quartz crucibles. The compositions o f the alloys after saturation were determined by the weighing.…”

Microstructure and Thermal Analysis of As-Cast Ag-Bi-Ni alloys

“…1), were synthesized by melting accurately weighed amounts of pure constituents: Ag (99.99 wt.%), Bi (99.999 wt.%), and Ni (99.99 wt.%). Alloys were prepared by induction melting 12 in cylindrical quartz crucibles and allowed to cool in the same crucibles. In order to avoid oxidation, the apparatus was flushed with high-purity Ar (99.999 vol.%) before melting, and gas flow was maintained during melting and cooling.…”

On plastic deformation of bulk metallic glasses in Bridgman anvils

“…Bulk metallic glasses (BMG) of three compositions were selected for the study: Ti 40 Cu 40 Pd 10 Zr 10 (Pd-10), Ti 40 Cu 36 Pd 14 Zr 10 (Pd-14) and Ti 40 Cu 30 Pd 20 Zr 10 (Pd-20). The alloys were prepared from high-purity components using the levitation method in argon medium [14]. Bulk amorphous bars with a diameter of 2.8 mm were cast into a copper mould which was cooled.…”