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Ordering behaviors and age-hardening in experimental AuCu–Zn pseudobinary alloys for dental applications

Paper ID Volume ID Publish Year Pages File Format Full-Text
13600 882 2002 7 PDF Available
Title
Ordering behaviors and age-hardening in experimental AuCu–Zn pseudobinary alloys for dental applications
Abstract

Age-hardening mechanisms and related ordering behaviors of the experimental (AuCu)1−xZnx alloys with x⩽0.2 were investigated for dental applications. The addition of Zn to equiatomic AuCu greatly increased the age-hardening rate and delayed overaging. It was suggested that the quenched-in excess vacancies were greatly related to the age-hardening rate in the AuCu–Zn pseudobinary alloys. In these alloys, the hardness became maximum during the very initial stage of ordering, and with the development of ordered phase, the hardness began to decrease. Transmission electron microscopy revealed that the age-hardening of AuCu–Zn pseudobinary alloys is caused by lattice distortion that occurred during the very early stage of atomic ordering. The addition of Zn to AuCu effectively increased the density of antiphase boundaries per unit volume of the AuCu II superstructure. This is suggested to be the main cause for the retardation of the overaging in the alloys containing Zn of 5 at% or more. This pronounced effect of Zn addition to AuCu alloy on its age-hardening characteristics may be advantageous for obtaining stable mechanical properties of dental casting gold alloys.

Keywords
Dental alloys; Age-hardening; Ordering behaviors; X-ray diffraction; Transmission electron microscopy
First Page Preview
Ordering behaviors and age-hardening in experimental AuCu–Zn pseudobinary alloys for dental applications
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 23, Issue 24, December 2002, Pages 4873–4879
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering