| A Study on the Microstructure and Anisotropic Mechanical Properties of Oxygen-Free Copper Fabricated by Equal Channel Angular Pressing |
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Jaekun Lee, Younggon Hong, Hyoungseop Kim, Sunghyuk Park |
12nd Research Division, Research and Development Institute
2Department of Materials Science and Engineering, Pohang University of Science and Technology
3School of Materials Science and Engineering, Kyungpook National University |
| ECAP공법으로 제조된 무산소동의 미세조직 및 기계적 성질 이방성에 대한 고찰 |
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이재근, 홍영곤, 김형섭, 박성혁 |
1(주)풍산기술연구원 연구2실
2포항공과대학교 신소재공학과
3경북대학교 신소재공학부 |
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| Abstract |
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Equal channel angular pressing(ECAP) is a severe plastic deformation technique capable of introducing large shear strain in bulk metal materials. However, if an ECAPed material has an inhomogeneous microstructure and anisotropic mechanical properties, this material is difficult to apply as structural components subjected to multi-axial stress during use. In this study, extruded oxygen-free copper(OFC) rods with a large diameter of 42 mm are extruded through ECAP by route Bc up to 12 passes. The variations in the microstructure, hardness, tensile properties, and microstructural and mechanical homogeneity of the ECAPed samples are systematically analyzed. High-strength OFC rods with a homogeneous and equiaxed-ultrafine grain structure are obtained by the repeated application of ECAP up to 8 and 12 passes. ECAPed samples with 4 and 8 passes exhibit much smaller differences in terms of the average grain sizes on the cross-sectional area and the tensile strengths along the axial and circumferential directions, as compared to the samples with 1 and 2 passes. Therefore, it is considered that the OFC materials, which are fabricated via the ECAP process with pass numbers of a multiple of 4, are suitable to be applied as high-strength structural parts used under multi-axial stress conditions. |
| Key Words:
ECAP, OFC, Anisotropy, Mechanical Property |
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