High temperature alloy for machine components based on boron doped TiAl

US5286443A · kind A · utility

Assignee

• Asea Brown Boveri, S.A. · CH

Inventors

• Mohamed Nazmy · Fislisbach, CH
• Markus Staubli · Dottikon, CH

Key dates

• Filing date: Nov 25, 1992
• Grant date: Feb 15, 1994
• Expiry date: Nov 25, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C14/00
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

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: EQU Ti.sub.x El.sub.y Me.sub.z Al.sub.1-(x+y+z), in which El=B, Ge or Si and Me=Co, Cr, Ge, Hf, Mn, Mo, Nb, Pd, Ta, V, W, Y, and/or Zr and: ______________________________________ 0.46 .ltoreq.x .ltoreq.0.54, 0.001 .ltoreq.y .ltoreq.0.015 for El = Ge and Me = Cr, Hf, Mn, Mo, Nb, Ta, V and/or W, 0.001 .ltoreq.y .ltoreq.0.015 for El = Si and Me = Hf, Mn, Mo, Ta, V and/or W, 0 .ltoreq.y .ltoreq.0.01 for El = B and Me = Co, Ge, Pd, Y and/or Zr, 0 .ltoreq.y .ltoreq.0.02 for El = Ge and Me = Co, Ge, Pd, Y and/or Zr, 0.0001 .ltoreq.y .ltoreq.0.01 for El = B and Me = Cr, Mn, Nb and/or W, 0.01 .ltoreq.z .ltoreq.0.04 if Me = an individual element, 0.01 .ltoreq.z .ltoreq.0.08 if Me = two or more individual elements and 0.46 .ltoreq.(x + y + z) .ltoreq.0.54. ______________________________________