Degradable compositions, apparatus comprising same, and method of use

Compositions, apparatus comprising a composition and methods of use are described, wherein one composition comprises substantially one or more reactive metals in a major portion and one or more alloying elements in a minor proportion, provided the composition is of high strength, is controllably reactive. and degradable under defined conditions. The compositions of the invention may occur in various morphologies, comprising a reactive metal or a degradable alloy processed into an alloy of crystalline, amorphous or mixed structure, which may constitute the matrix of another composition, for example a composite. Methods for using an apparatus comprising a composition, particularly in oilfield operations, are also described (e.g., for flow and displacement control, sensors and control elements).