Transmission Electron Microscopy Observations on Cu-Mg Alloy Systems

Abstract:

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Environmentally friendly Cu-based alloys with high strength and low electrical resistivity have been much sought in order to replace deleterious Cu-Be alloys for electrical applications. As one of the candidate systems, we have examined age-hardening behaviors of Cu-Mg alloys by using transmission electron microscopy (TEM). Cu-2.26wt.%Mg alloys were solution-treated and annealed at 723K, and their structural changes have been investigated. The Vickers hardness measurements showed that they aged-harden gradually. Our TEM observations showed that annealing for 6h brings about precipitation of numerous needle-like particles of 10 nm in length. The diffraction studies indicated these precipitates consist of the Cu2Mg phase with {111}Cu habit planes. When annealed for 96h, these precipitates become semi-coherent, which was manifested by moiré fringes; while maintaining the orientation relationship of (111)Cu//(111)Cu2Mg, [110]Cu//[110]Cu2Mg.

Info:

Periodical:

Solid State Phenomena (Volume 127)

Edited by:

Masaaki Naka

Pages:

103-108

DOI:

10.4028/www.scientific.net/SSP.127.103

Citation:

K. I. Nishikawa et al., "Transmission Electron Microscopy Observations on Cu-Mg Alloy Systems", Solid State Phenomena, Vol. 127, pp. 103-108, 2007

Online since:

September 2007

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Price:

$35.00

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