We present experimental evidence that pressure solution creep does not establish a steady-state interface microstructure as previously thought. Conversely, pressure solution controlled strain and the characteristic length scale of interface microstructures grow as the cubic root of time. Transient creep with the same scaling is known in metallurgy (Andrade creep). The apparent universal scaling...

.............................................................................................................................. iii ACKNOWLEDGMENTS ......................................................................................................... iv TABLE OF CONTENTS ............................................................................................................ v LIST OF FIGU...

The creep-fatigue interaction has been studied and innovative mathematical models are proposed to predict the operating life of aircraft components, specifically gas turbine blades subject to creep-fatigue at high temperatures. The historical evolution of the creep-fatigue lifetime prediction is given in order to place the present study in the context. A literature review of the life estimation...

Static and completely reversed cyclic creep acceleration characteristics of Al – 22 wt% Ag alloy were investigated using a modified tensile testing machine. Different amplitudes of reversed cyclic stress (σrev) ranging from 7.2 to 10.2 MPa at different working temperatures ranging from 353 K to 413 K were performed. To get a relation between aging temperature and threshold stress (σth) for cycl...

Reactive infiltration processing was used to fabricate bulk NiAl and fiber-reinforced NiAl composites. Homogenous, pore-free materials were obtained by chemical reaction between nickel and aluminum after complete infiltration with liquid aluminum of preforms of nickel wires (containing tungsten wires for the composites) with low surface-to-volume ratio, high permeability, and regular infiltrati...

steady state creep of the alloy was in a thermodynamical steady state, (2) which configuration of the dislocation network was contributing to the creep strength, and (3) which change in the dislocation network was the cause of the creep recovery. Specimens were furnace-cooled under stress and then observed by transmission electron microscopy. The creep stress was reduced during the test and the...