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ASM Handbook

Materials for Medical Devices

Edited by
Roger J. Narayan
Roger J. Narayan
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ASM International
Volume
23
ISBN electronic:
978-1-62708-198-6
Publication date:
2012
Book Chapter

Cobalt-Base Alloys

By
Robert Pilliar
Robert Pilliar
University of Toronto
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Scott D. Ramsay
Scott D. Ramsay
University of Toronto
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Published:
2012
Page range:
211 - 222
Publication history
June 25, 2012

Abstract

This article reviews some concepts considered important for an understanding of processes used for preparing cobalt-chromium alloy implants, the microstructures resulting from this processing, and the resulting material properties. The review includes the solidification of alloys, diffusionless (martensitic) phase transformation as occurs with face-centered cubic to hexagonal close-packed transformation in cobalt-chromium alloys, stacking faults and twins and their role in this transformation. It also includes strengthening mechanisms that are responsible for the mechanical properties of cast and wrought cobalt alloys. The article contains tables that list the commonly used cobalt alloys and their biomedical applications and chemical compositions. It discusses the mechanical and corrosion properties of cobalt alloys, and provides a description of the microstructure of cobalt alloys.

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Robert Pilliar, Scott D. Ramsay, 2012. "Cobalt-Base Alloys", Materials for Medical Devices, Roger J. Narayan

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