Ordered intermetallic compounds have been investigated very intensively in the recent years since a variety of their properties make them superior in high temperature applications over the commonly used disordered alloys. Their elastic moduli are usually high and they have very high yield or fracture stresses that are maintained up to high temperatures. Moreover, compounds based on light elements, such as Ti and Al. can have very low densities and thus high strength-to-weight ratio. Furthermore, these alloys often have high melting temperatures and much lower self-diffusion coefficients than do disordered alloys and, therefore, higher creep strength and corrosion resistance.
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