Abstract
Potentials of intermetallics for high temperatures were realized in the early 1900s. But initial attempts from time to time failed due to inadequate ductility as well as poor high-temperature creep strength exhibited by the intermetallic phases. From these early attempts three main ideas germinated. First, addition of ternary elements can improve properties of intermetallic phases dramatically. Second, introduction of new phases not only can change properties but also allow tailoring of the microstructure according to the demand of the application requirements. Third, combining brittle phase along with a ductile matrix it is possible to develop a composite material that encompasses the inherent limitations of the intermetallic phases. Based on these points, a new series of alloys and phases were developed. These recent developments and innovations are summarized in this chapter. The first part of the chapter is devoted to various intermetallic phases, which are under active consideration, and the second part of the chapter is focused on the development of refractory metal-based alloy and high-entropy alloy systems.
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