Browsing by Subject "transmission electron microscopy"

Now showing 1 - 1 of 1

Access status: Open Access ,
Amorphization and liquid state separation in $Ni_{80-2x}Cu_{x}Fe_{x}P_{20}$ alloys
(2014) Ziewiec, Krzysztof; Prusik, Krystian; Różycka, Mirosława
The aim of the work is to study the ability and potential of glass formation in Ni-Fe-Cu-P alloys. A series of alloys were produced in arc furnace (i.e. $Ni_{70}Fe_{5}Cu_{5}Pe_{20}, Ni_{60}Fe_{10}Cu_{10}P_{20}, Ni_{50}Fe_{15}Cu_{15}P_{20}, Ni_{40}Fe_{20}Cu_{20}P_{20}, Ni_{30}Fe_{25}Cu_{25}P_{20}, Ni_{20}Fe_{30}Cu_{30}P_{20}$). The primary microstructure of the ingots was studied. The ribbons in as-melt-spun state were characterized by X-ray diffraction (XRD). The $Ni_{70}Fe_{5}Cu_{5}P_{5}, Ni_{60}Fe_{10}Cu_{10}P_{20}$ melt-spun alloys were found to be amorphous. For higher copper and iron concentrations a crystalline structure was obtained after melt spinning. This correlated with the tendency for the formation of the Fe-based phases enriched in P and Cu-based poorly alloyed phases which resulted in the formation of crystalline microstructure in melt-spun ribbons. For higher concentration of Fe and Cu, microstructures of the alloys contained constituents resultant from a tendency for separation in the liquid state. It is observed that the formation of the crystal line melt-spun ribbons is caused by the attraction of phosphorus by iron and the formation of copper-based fcc phase.