Ultrasonic Evaluation of Textures in Metal-Matrix Composites
Date
Authors
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The combination of a ductile metal and a high strength reinforcement leads to a metal-matrix composite which has desirable mechanical properties of high strength and toughness. These properties are usually governed by the properties of each phase, in addition to the shape, orientation and the volume fraction of the reinforcing phase. Since many of these composite properties are characteristic of the bulk, ultrasonics have been shown to provide promising NDE-methods for the characterization of metal-matrix composites ([1]). In general the desired isotropic mechanical behaviour of these composites is difficult to achieve. During manufacturing textures are developed by deformation processes and heat treatments, generating considerable anisotropy in the material’s properties. This affects the elastic as well as the plastic behaviour. Additionally the presence of textures influences the ultrasound velocity, which is also affected by stress. Therefore stress-analysis in NDE is restricted to untextured components or those with known texture influence. In this work measurements of ultrasonic velocities are used to determine the texture of metal-matrix composites and the influence of the reinforcing phase on the texture.