Abstract
Until recently, the main way to increase the high-temperature strength of dispersion-hardening alloys consisted in changing the content of the alloying elements in order to determine their optimum concentrations that would ensure specified sets of properties. As a result, modern industrial high-temperature nickel alloys contain 10 to 15 alloying and microalloying elements and the solubility of components in the reinforcing phases is maximum. However, this has not solved completely the problem of creep resistance and fracture of high-temperature materials, because the typical fracture in polycrystalline castings occurs along grain boundaries perpendicular to the axis of load application. The present work is concerned with the structure and properties of single-crystal high-temperature nickel alloys under cyclic loading.
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