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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2018.8
- 수록면
- 222 - 226 (5page)
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초록· 키워드
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Severe plastic deformation (SPD) is a promising method for drastically enhancing the mechanical properties of the materials by grain refinement of metallic materials. However, inhomogeneous deformation during the SPD process results in the inhomogeneous microstructure of the SPD-processed material. We manufactured cylindrical copper specimens of 42 ㎜ in diameter with ultrafine grains (UFG) using an equal channel angular pressing (ECAP) to figure out the relationship between homogeneous microstructure and the number of the processing passes. Two specimens, which are ECAP-processed 4 times (4pass) and 6 times (6pass) each with Route Bc, are prepared for comparison of mechanical properties and microstructure. The results show that the mechanical properties of the two specimens (4pass and 6pass) are similar. Moreover, both the specimens show highly enhanced mechanical properties. The 4pass specimen, however, shows inhomogeneity in hardness distribution, while the 6pass specimen shows a homogeneous distribution. Microstructure analysis reveals that the 4pass specimen has an inhomogeneous microstructure with incompletely refined grain structure. This inhomogeneity of the 4pass specimen could be explained by the circumferential rotation during ECAP process.
목차
Abstract
1. 서론
2. 실험 방법
3. 결과
4. 결론
REFERENCES
참고문헌 (13)
참고문헌 신청
R. Z. Valiev, I. V. Alexandrov, Y. T. Zhu, T. C. Lowe, 2002, Paradox of strength and ductility in metals processed by severe plastic deformation, J. Mater. Res., Vol. 17, No. 1, pp. 5-8.
A. P. Zhilyaev, T. G. Langdon, 2008, Using highpressure torsion for metal processing: Fundamentals and applications, Prog. Mater. Sci., Vol. 53, No. 6, pp. 893-979.
Y. Beygelzimer, V. Varyukhin, D. Orlov, S. Synkov, 2003, Twist extrusion?process for strain accumulation, TEAN, Donetsk, p. 87.
Y. Saito, H. Utsunomiya, N. Tsuji, T. Sakai, 1999, Novel ultra-high straining process for bulk materials? development of the accumulative roll-bonding (ARB) process, Acta Mater., Vol. 47, No. 2, pp. 579-583.
H. S. Kim, M. H. Seo, S. I. Hong, 2000, On the die corner gap formation in equal channel angular pressing, Mat. Sci. Eng. A, Vol. 291, No. 1-2, pp. 86-90.
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UCI(KEPA) : I410-ECN-0101-2018-551-003343603