Abstract
Extensive research during the last eight years has resulted in the development and improvement of second-generation gamma alloys of engineering importance, Ti-48Al-2(Cr or Mn)-2Nb and derivatives. These alloys exhibit properties, in duplex micro-structural forms, meeting requirements for some gas-turbine and automobile engine components that may be used up to 760 °C. These achievements were made possible by an improved understanding of both fundamental and practical aspects of these aluminides, such as phase relations, microstructure evolution and control, processing, microstructure-property relationships, and deformation and fracture processes. Nevertheless, widespread higher performance and/or higher-temperature applications of these alloys appear unlikely unless the current properties are dramatically improved.
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Editor’s Note
This is the final part of a series on ordered intermetallic alloys. Part I, which appeared in May 1993, covered nickel and iron aluminides. Part II, published in June 1993, covered suicides, trialuminides, bery Hides, chromides, and other aluminides. This article completes the picture by covering gamma titanium aluminides, which in many ways are the most technologically developed of the ordered intermetallics.
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Kim, YW. Ordered intermetallic alloys, part III: Gamma titanium aluminides. JOM 46, 30–39 (1994). https://doi.org/10.1007/BF03220745
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DOI: https://doi.org/10.1007/BF03220745