Structural Development of Micro-Structurally Toughened Metal Matrix Composites.

摘要

This study addressed the development of a new class of discontinuously reinforced metals that possess substantially improved damage tolerance relative to the currently available materials. The novelty is to allow specially designed toughening mechanisms to be operative in the composites. Technical effort of this study focused on developing a fundamental understanding of the toughening mechanisms at the micromechanics level, and identifying possible SDI structural components components that can be improved through the use of this material. This goal was achieved by the development of two microchemical material models. The first model addressed the stress-strain constitutive modeling, and the second model addressed the modeling of fracture toughness of the new composites. Keywords: Discontinuously reinforced metals, Microstructure toughening mechanisms, Silicon carbide/aluminum, Impact damage, Structural applications, Metal matrix composites. (jes)