High temperature alloy for machine components based on boron doped TiAl

摘要

The high temperature alloy is intended for machine components subjected to high mechanical and thermal stress. It is essentially based on doped TiAl and has the following composition:PPTi.sub. x El.sub.y Me.sub.z Al.sub.1-(x+y+z),PPin which El=B, Ge or Si and Me=Co, Cr, Ge, Hf, Mn, Mo, Nb, Pd, Ta, V, W, Y, and/or Zr and:PP______________________________________ P P0.46 ≦x ≦0.54, PP0.001 ≦y . ltoreq.0.015 PP for El = Ge and Me = PP Cr, Hf, Mn, Mo, Nb, PP Ta, V and/or W, PP 0.001 ≦y ≦0.015 PP for El = Si and Me = PP Hf, Mn, Mo, Ta, V PP and/or W, P P0 ≦y ≦ 0.01 PP for El = B and Me = PP Co, Ge, Pd, Y and/or PP Zr, P P0 ≦y ≦0.02 PP for El = Ge and Me = PP Co, Ge, Pd, Y and/or PP Zr, P P0.0001 ≦y ≦0.01 PP for El = B and Me = PP Cr, Mn, Nb and/or W, PP0.01 . ltoreq.z ≦0.04 PP if Me = an individual P P element, PP0.01 ≦z ≦0.08 P P if Me = two or more PP individual elements PP and PP0.46 ≦(x + y + z) P P ≦0.54. PP ______________________________________ PP