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Landolt-Börnstein - Group VIII Advanced Materials and Technologies

14.4 Intermetallic materials for structural high temperature applications

Abstract

Various intermetallic phases offer a high potential for the developments of new structural materials for high temperature applications and have been selected as bases for alloy developments. Basic properties of primary importance for any application are low density - in view of developing lightweight materials, high melting temperature - in view of high temperature stability, and alloy fabrication as well as elastic modulus and diffusion coefficient - in view of their effects on the mechanical behaviour at low and high temperatures, respectively. Presently the titanium aluminide alloys are the most advanced intermetallic materials, which are considered for various automotive and aerospace applications. Various versions of the binary Ti-Al phase diagram are available, which are still under discussion because of conflicting results on the various phase equilibria. Characteristic oxidation data for various Ti3Al-base alloys at 800 °C, i.e. apparent parabolic rate constant kp and apparent activation energy Q are provided. Phase diagrams, composition and applications, physical properties, mechanical properties and chemical properties of iron aluminides and nickel aluminides are tabulated. Various transition metal silicide phases are considered as promising candidate phases for the development of new high temperature materials because of attractively high melting temperature, strength, oxidation resistance and low density. In view of the developments of new alloys and composites on the base of MoSi2, the figures present the available information on the binary Mo-Si system and the ternary Mo-Si-C and Mo-Si-N systems. The composition and applications, physical properties, mechanical properties and chemical properties of various silicides are tabulated.

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Title
14.4 Intermetallic materials for structural high temperature applications
Book Title
Powder Metallurgy Data. Refractory, Hard and Intermetallic Materials
In
14 Intermetallic materials
Book DOI
10.1007/b83029
Chapter DOI
10.1007/10858641_18
Part of
Landolt-Börnstein - Group VIII Advanced Materials and Technologies
Volume
2A2
Editors
  • P. Beiss
  • R. Ruthardt
  • H. Warlimont
  • Authors
  • G. Sauthoff
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