Ultrafine Grained Cu-diamond Composites using High Pressure Torsion

Eun-Yoo Yoon; Dong-Jun Lee; Taek-Soo Kim; Hyoung-Seop Kim

doi:10.4150/KPMI.2012.19.3.204

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고압비틀림 공정으로 제조된 구리-다이아몬드 초미세립 복합재료: 윤은유, 이동준, 김택수, 김형섭
Ultrafine Grained Cu-diamond Composites using High Pressure Torsion: Eun-Yoo Yoon, Dong-Jun Lee, Taek-Soo Kim, Hyoung-Seop Kim; Journal of Korean Powder Metallurgy Institute 2012;19(3):204-209
DOI: https://doi.org/10.4150/KPMI.2012.19.3.204

¹포항공과대학교 신소재공학과
²포항공과대학교 신소재공학과
³한국생산기술연구원 희소금속산업기술센터
⁴포항공과대학교 신소재공학과
¹Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)
²Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)
³Department of Rare Metals, Korea Institute of Industrial Technology (KITECH)
⁴Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)

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Abstract

In this work, powder metallurgy and severe plastic deformation by high-pressure torsion (HPT) approaches were combined to achieve both full density and grain refinement at the same time. Pure Cu powders were mixed with 5 and 10 vol% diamonds and consolidated into disc-shaped samples at room temperature by HPT at 1.25 GPa and 1 turn, resulting in ultrafine grained metallic matrices embedded with diamonds. Neither heating nor additional sintering was required with the HPT process so that in situ consolidation was successfully achieved at ambient temperature. Significantly refined grain structures of Cu metallic matrices with increasing diamond volume fractions were observed by electron backscatter diffraction (EBSD), which enhanced the microhardness of the Cu-diamond composites.

Keywords: High pressure torsion;Copper;Diamond;Ultrafine grain;Nanocomposite;

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