Location

La Jolla, CA

Start Date

1-1-1989 12:00 AM

Description

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.

Volume

8B

Chapter

Chapter 9: Characterization of Materials

Section

Acoustoelasticity, Stress and Texture

Pages

1871-1878

DOI

10.1007/978-1-4613-0817-1_237

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Ultrasonic Evaluation of Textures in Metal-Matrix Composites

La Jolla, CA

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.