High temperature alloy for machine components based on 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:PP ______________________________________ PPTi.sub.x El.sub. y Me.sub.z Al.sub.1 -(x + y + z), in which PPEl = B, Ge or Si and Me = Co, Cr, Ge, Hf, Mn, Mo, PPNb, Pd, Ta, V, W, Y, and/or Zr and: PP0.46 ≦x ≦0.54, P P0.001 ≦y ≦0.015 PP for El = Ge and Me = PP Cr, Hf, Mn, Mo, Nb, PP Ta, V and/or W, PP0.001 ≦y ≦0.015 P P for El = Si and Me = PP Hf, Mn, Mo, Ta, V P P and/or W, PP0 ≦y ≦0.01 P P for El = B and Me = PP Co, Ge, Pd, Y and/or PP Zr, PP0 ≦y ≦0.02 P P 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 ≦z ≦0.04 PP if Me = an individual PP element, PP0.01 ≦z ≦0.08 PP if Me = two or more P P individual elements PP and P P0. 46 ≦(x + y +z) PP ≦0.54.;PP______________________________________ P P