The metallographic and structural features of the alloys in the pseudo-binary section between Ni3Si (L12) and Ni3Ti (D024) were investigated. The L12 phase (γ′) extended along a pseudo-binary line between the two phases with Ti solubility of about 11 at.%. Also, the L12 phase expanded up to about 80 at.% Ni at high Ti concentration. Consistent with previous observations, the addition of the Ti elements into the Ni3Si alloy led to congruent melting of L12 phase. Based on the observations of X-ray diffraction and an electron channeling technique aided with EDX (Energy Dispersive X-ray spectrometer), it was shown that the alloying element, Ti, substituted for the component element of Si the ternary alloy Ni3(Si, Ti) was highly ordered. The solubility limit of boron in Ni3(Si, Ti) was shown to be very low, i.e. less than 50 ppm.
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