Time-dependent small-scale fracture in metallic materials at high temperatures
Ohtani, Ryuichi
This paper deals with time-dependent small-scale intergranular fracture in metals at high temperatures. First, diffusional cavitation during fatigue is discussed in terms of its mechanism. Creep ...cavities and cavity-type cracks nucleate and grow inside the material under combined very slow tension and fast compression cycling at relatively high temperatures, and they are extinguished by the succeeding fatigue under the inverse cycling of combined fast tension and very slow compression. Second, small-scale fracture is discussed in terms of its process. Fracture of a thin aluminum wire in micro-electronic packages is demonstrated through a numerical simulation of grain boundary grooving caused by surface and grain boundary diffusion. Third, cavities and microcracks appearing in polycrystalline steels are discussed in terms of the effects of their microstructures. Characterization of multiple microcracking is attempted on the bases of a numerical simulation.
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