首页|Fabrication of Ultrafine Grained Copper Alloy by 3-Layers Accumulative Roll-Bonding Process

Fabrication of Ultrafine Grained Copper Alloy by 3-Layers Accumulative Roll-Bonding Process

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The 3-layers accumulative roll bonding process (ARB) has been attempted to increase the strength of copper alloy (Cu-0.02wt.%P) by refining grain size. The 3-layers accumulative roll bonding was conducted up to 7 cycles at room temperature without lubrication. Microstructural evolution of the copper alloy with the number of the 3-layers ARB cycles was investigated by optical microscopy (OM), transmission electron microscopy (TEM), and electron back scatter diffraction (EBSD). The average grain size has been refined from 20 μm before ARB to 170 nm after 7 cycles of 3-layers ARB. More than 70% of ultrafine grains formed by 3-layers ARB were composed of high angle grain boundaries. The average misorientation angle of ultrafine grains was 30.7 degrees in the center of the specimen. Tensile strength after 7 cycles of 3-layers ARB was 605 MPa, which is about 3.2 times higher than the initial value.

ultrafine grainscopper alloyshigh strengthhigh electrical conductivityaccumulative roll-bonding process

Cha Yong Lim、Hyoung Wook Kim、Seong Hee Lee

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Structural Materials Division, Korea Institute of Materials Science, Changwon, 641-831, Korea

Department of Advanced Materials Science and Engineering,Mokpo National University, Chonnam, 534-729, Korea

2010

10.4028/www.scientific.net/KEM.443.158

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.443
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