Abstract
High-temperature phase relations in the Fe-rich corner of the Nd-Fe-Ti ternary alloy system have been investigated and an equilibrium phase diagram has been constructed at 1100 °C. Arc-melted and annealed alloys of systematically varying compositions were characterized utilizing scanning electron microscopy, an energy dispersive x-ray microanalysis system (EDS), x-ray diffraction, and optical metallography. Three major phases have been identified, the well known Nd(Fe,Ti)12 ‘‘1:12’’ (ThMn12-type structure) and Nd2(Fe,Ti)17 ‘‘2:17’’ (Th2Zn17-type structure) compounds, and a phase with approximate composition Nd2(Fe,Ti)19 ‘‘2:19.’’ The crystal structure of the latter phase has very recently been solved, and the ‘‘ideal’’ composition shown to be Nd3(Fe,Ti)29 ‘‘3:29.’’ Quantitative EDS data has been used to identify the compositional limits for the three major phases. Annealing the ‘‘1:12’’ and ‘‘3:29’’ ternary phases at 900 °C results in a slow decomposition into Nd2(Fe,Ti)17, Fe2Ti, and α-Fe(Ti).
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