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Title: Microstructure, flow behavior, and bulk texture evolution of cold drawn copper-silver composites
Authors: Dodla, Srihari
Thiem, P.
Kruger, M.
Dietrich, D.
Bertram, A.
Keywords: Cu-Ag composite
Cold drawn
Lamellar phase structure
Electon backscattered diffraction (EBSD)
X-ray diffraction (XRD)
Compression testing
Texture measurement
Issue Date: 2015
Publisher: © Elsevier
Citation: DODLA, S. ... et al, 2015. Microstructure, flow behavior, and bulk texture evolution of cold drawn copper-silver composites. Journal of Alloys and Compounds, 647, pp. 519 - 527
Abstract: In the last 20 years, several groups used nanostructured composites to produce high strength conductor materials for magnetic applications. The mechanical strength of Cu-Ag composites is strongly influenced by metal forming operations. Within the scope of the paper, the microstructure, the mechanical behavior, and the texture evolution are investigated for two cold drawn Cu-63wt%Ag composite rods. The aim of these investigations is to understand the influence of the microstructure and texture evolution on the mechanical behavior. The investigation is carried out using optical microscopy, scanning electron microscopy (SEM) along with electron backscattered diffraction (EBSD), X-ray diffraction measurements (XRD), and compression testing. The microscopic images show that the drawn samples mainly have a lamellar structure of Cu and Ag phases. However, elliptical shaped regions of primarily solidified copper solid solution are also observed. With increase of plastic deformation, the average lamella thickness of both phases has been decreased. EBSD measurements show that abundant banded regions are observed in the Ag phase while very few banded regions are present in the Cu phase. The bulk XRD measurements reveal that both phases of the drawn samples initially have the same type of texture, and both phases develop the same brass-type [110](112) texture. The texture intensity increases for both phases as the drawing strain increases. Compression tests are performed at constant strain rate of 10<sup>-4</sup> s<sup>-1</sup> at room temperature. The stress-strain curves under compression are presented for two different drawn samples. The texture measurements after compression reveal that the texture becomes more pronounced.
Description: This paper was accepted for publication in the journal Journal of Alloys and Compounds and the definitive published version is available at http://dx.doi.org/10.1016/j.jallcom.2015.06.145
Sponsor: Financial assistance from German Science Foundation (DFG) through GRK1554 is gratefully acknowledged.
Version: Accepted for publication
DOI: 10.1016/j.jallcom.2015.06.145
URI: https://dspace.lboro.ac.uk/2134/19012
Publisher Link: http://dx.doi.org/10.1016/j.jallcom.2015.06.145
ISSN: 0925-8388
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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