Abstract
Nickel-based superalloys are of great technological interest because of their attractive mechanical properties at high temperatures. Their ability to maintain high strength under extreme conditions of thermal cycling makes them highly suitable for applications such as turbine blade material for aircraft engines. Single crystal nickel-based superalloys containing refractory elements such as Mo, Ta and Re have received considerable attention on account of their high creep strength at elevated temperatures. In these materials, the Ll2-ordered γ' phase is initially present as discrete cuboids in the disordered γ matrix. During high temperature creep, with the stress applied along the <100> direction, these cuboids directionally coarsen to form continuous γ' lamellae perpendicular to the applied-stress axis. The improvement in creep strength that occurs as a result of this change in the γ' morphology has been attributed to a number of different possible mechanisms. One mechanism suggested is the segregation of molybdenum to the γ-γ' interface which could impede dislocations producing increased creep strength.
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