Alloying of a P/M titanium-nickel composite of eutectic composition

The addition of 2% P or B has no effect on the melting point of a Ti-Ni alloy of eutectic composition, 7% Si raises it by 50°K, and 10% Cu lowers it by 100°K. Alloying with boron and phosphorus does not alter the phase composition and structure of the alloy. Boron and phosphorus dissolve in the titanium phase of the eutectoid, thereby increasing the latter's hardness. Alloying with copper suppresses the eutectoid decomposition of the titanium-nickel alloy during cooling. Copper becomes distributed between the two structural constituents, as a result of which the hardness of the intermetallic compound Ti2Ni falls and that of the eutectic rises. Alloying with silicon leads to the formation of a new phase, Ti3Si.