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The phase constituents of Ir-Nb-Pt-Al quaternary system were investigated using a combination of several methods. Two L1 2 phases (L1 2 -Ir 3 Nb and L1 2 -Pt 3 Al) were found to be miscible in this system, and a fully fcc/L1 2 two-phase structure was observed in all the alloys investigated. A partial isothermal phase diagram at 1500 o C was plotted...
The equilibrium phases of three Ir-Nb-Ni-Al quaternary alloys at the Ir-rich corner were investigated in some detail. The phases were determined by X-ray profile as well as microstructure observation. Three phases of fcc/L1 2 -Ir 3 Nb/B2-IrAl were found in two samples, and four phases of fcc/L1 2 -Ir 3 Nb/L1 2 -Ni 3 Al/B2-IrAl were characterized in one...
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