| 摘要 |
A two phase titanium aluminide alloy having a lamellar microstructure with little intercolony structures. The alloy can include fine particles such as boride particles at colony boundaries and/or grain boundar y equiaxed structures. The alloy can include alloying additions such as .ltoreq. 10 at % W, Nb and/or Mo. The alloy can be free of Cr, V, Mn , Cu and/or Ni and can include, in atomic %, 45 to 55 % Ti, 40 to 50 % Al, 1 to 5 % Nb, 0.3 to 2 % W, up to 1% Mo and 0.1 to 0.3 % B. In weight %, the alloy can include 57 to 60 % Ti, 30 to 32 % Al,4 to 9 % Nb,up to 2 % Mo, 2 to 8 % W and 0.02 to 0.08 % B.
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