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Research Papers

Texture and Grain Boundary Character Distribution in a Thermomechanically Processed OFHC Copper

[+] Author and Article Information
Khaled J. Al-Fadhalah

Department of Mechanical Engineering, College of Engineering and Petroleum,  Kuwait University, P.O. Box 5969, Safat 13060, Kuwaitfadhalah@kuc01.kuniv.edu.kw

J. Eng. Mater. Technol 134(1), 011001 (Dec 06, 2011) (9 pages) doi:10.1115/1.4004069 History: Received June 30, 2010; Revised March 06, 2011; Accepted March 07, 2011; Published December 06, 2011; Online December 06, 2011

The effect of texture on grain boundary character distribution (GBCD) in thermomechanically processed oxygen-free high-conductivity copper has been investigated. Copper samples were cold rolled to a reduction in thickness of 50% and then annealed for 60 min in the range of 400–600°C. GBCD and texture were measured using electron backscatter diffraction. The fraction of special boundaries (Σ3, Σ9, and Σ27) varied from 59% to 71%, with the maximum in the sample annealed at 500°C. The results indicate that cold rolling provided a strong texture of brass type. It was found that the sample annealed at 500°C have texture components of cube, Goss, rotated-Goss, and Y orientations. These texture components were in relation with the formation of annealing twins and Σ3 boundaries. It was also shown that twin-induced GBCD evolution occurred by strain-induced boundary migration, multiple twinning, and conventional recrystallization. Annealing at 600°C caused full recrystallization and grain growth, showing a strong cube recrystallization texture. The grain growth was found to hinder the formation of special boundaries.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Optical microscope micrographs of copper microstructure for sample A (a), sample B (b), sample C (c), and sample D (d)

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Figure 2

Grain boundary reconstructions from EBSD mapping for sample A (a), sample B (b), sample C (c), and sample D (d). Thick gray lines denote special boundaries including Σ3, Σ9, and Σ27 boundaries, while black lines denote random HABs or random boundaries.

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Figure 3

OIM for sample A (a), sample B (b), sample C (c), and sample D (d). Maps were made in the ND. Different colors designate different crystallographic orientations (see standard triangle).

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Figure 4

General misorientation statistics for sample A (a), sample B (b), sample C (c), and sample D (d)

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Figure 5

ODF serials for sample A (a), sample B (b), sample C (c), and sample D (d). The capital characters in the figure denote the texture components as following: C, copper component {112}<111¯>; S, S component {123}<634¯>; B, brass component {011}<211¯>; G, Goss component {011}<100>; Gr , rotated Goss {011}<011¯>; W, cube component {100}<0 0 1>; Y, Y component {111}<112¯>.

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Figure 6

Orientation density f(g) of sample A along (a) α fiber and (b) β fiber. (c) Position f(g) in Euler space for β fiber

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Figure 7

{111} and {100} Pole figures for sample A (a), sample B (b), sample C (c), and sample D (d)

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Figure 8

OIM maps for sample E. Areas A and B present regions in (a) obtained by HR-EBSD. (a, c, e) OIM maps are made in the ND. (b, d, f) grain boundary reconstruction maps. The gray and black lines represent LABs and random boundaries (HABs); the red, yellow, and green lines denote Σ3, Σ9, and Σ27, respectively.

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