By the late 1940s, and since then, the continuous development of dislocation theories have provided the basis for correlating the macroscopic time- dependent deformation of metals and alloys-known as creep-to the time- dependent processes taking place within the metals and alloys. High- temperature deformation and stress relaxation effects have also been explained and modeled on similar bases. The knowledge of high-temperature deformation as well as its modeling in conventional or unconventional situations is becoming clearer year by year, with new contemporary and better performing high-temperature materials being constantly produced and investigated. This book includes recent contributions covering relevant topics and materials in the field in an