Strengthening of lotus-type porous copper by ECAE process

J. Lobos; S. Suzuki; H. Utsunomiya; H. Nakajima; M. A. Rodrigez-Perez

doi:10.1016/j.jmatprotec.2012.04.024

Strengthening of lotus-type porous copper by ECAE process

J. Lobos^*, S. Suzuki, H. Utsunomiya, H. Nakajima, M. A. Rodrigez-Perez

^*この研究の対応する著者

基幹理工学部

研究成果: Article › 査読

14 被引用数 (Scopus)

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Lotus-type porous copper with directional cylindrical pores was fabricated by unidirectional solidification in a pressurized hydrogen atmosphere. Improvements in microstructure and mechanical properties of the lotus-type porous copper by equal-channel angular extrusion (ECAE) were investigated using a die with a channel angle of 150°. The porosity decreases with increasing pass number, and decreases from 46% to 30% by four passes. It means that pore closure in the ECAE process is not significant. Both the specific compressive yield strength σ0.2% and the Vickers hardness HV of the lotus copper increase with increasing pass number of ECAE. The ECAE processed porous copper shows improved σ0.2% and HV comparable to those of the extruded nonporous copper. It is suggested that ECAE is a promising method to strengthen porous metals without significant pore closure.

本文言語	English
ページ（範囲）	2007-2011
ページ数	5
ジャーナル	Journal of Materials Processing Technology
巻	212
号	10
DOI	https://doi.org/10.1016/j.jmatprotec.2012.04.024
出版ステータス	Published - 2012 10月

ASJC Scopus subject areas

セラミックおよび複合材料
コンピュータサイエンスの応用
金属および合金
産業および生産工学

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10.1016/j.jmatprotec.2012.04.024

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title = "Strengthening of lotus-type porous copper by ECAE process",

abstract = "Lotus-type porous copper with directional cylindrical pores was fabricated by unidirectional solidification in a pressurized hydrogen atmosphere. Improvements in microstructure and mechanical properties of the lotus-type porous copper by equal-channel angular extrusion (ECAE) were investigated using a die with a channel angle of 150°. The porosity decreases with increasing pass number, and decreases from 46% to 30% by four passes. It means that pore closure in the ECAE process is not significant. Both the specific compressive yield strength σ0.2% and the Vickers hardness HV of the lotus copper increase with increasing pass number of ECAE. The ECAE processed porous copper shows improved σ0.2% and HV comparable to those of the extruded nonporous copper. It is suggested that ECAE is a promising method to strengthen porous metals without significant pore closure.",

keywords = "Equal-channel angular extrusion, Lotus-type porous copper, Porous metals, Vickers hardness, Yield strength",

author = "J. Lobos and S. Suzuki and H. Utsunomiya and H. Nakajima and Rodrigez-Perez, {M. A.}",

note = "Funding Information: The present work was supported by Global COE Program (Project: Center of Excellence for Advanced Structural and Functional Materials Design) from the Ministry of Education, Culture, Sports, Science and Technology, Japan and by the Spanish Agency for International Cooperation (AECI). The authors would like to thank Mr. J. Miyamoto of Osaka University for the technical support.",

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AU - Lobos, J.

AU - Suzuki, S.

AU - Utsunomiya, H.

AU - Nakajima, H.

AU - Rodrigez-Perez, M. A.

N1 - Funding Information: The present work was supported by Global COE Program (Project: Center of Excellence for Advanced Structural and Functional Materials Design) from the Ministry of Education, Culture, Sports, Science and Technology, Japan and by the Spanish Agency for International Cooperation (AECI). The authors would like to thank Mr. J. Miyamoto of Osaka University for the technical support.

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N2 - Lotus-type porous copper with directional cylindrical pores was fabricated by unidirectional solidification in a pressurized hydrogen atmosphere. Improvements in microstructure and mechanical properties of the lotus-type porous copper by equal-channel angular extrusion (ECAE) were investigated using a die with a channel angle of 150°. The porosity decreases with increasing pass number, and decreases from 46% to 30% by four passes. It means that pore closure in the ECAE process is not significant. Both the specific compressive yield strength σ0.2% and the Vickers hardness HV of the lotus copper increase with increasing pass number of ECAE. The ECAE processed porous copper shows improved σ0.2% and HV comparable to those of the extruded nonporous copper. It is suggested that ECAE is a promising method to strengthen porous metals without significant pore closure.

AB - Lotus-type porous copper with directional cylindrical pores was fabricated by unidirectional solidification in a pressurized hydrogen atmosphere. Improvements in microstructure and mechanical properties of the lotus-type porous copper by equal-channel angular extrusion (ECAE) were investigated using a die with a channel angle of 150°. The porosity decreases with increasing pass number, and decreases from 46% to 30% by four passes. It means that pore closure in the ECAE process is not significant. Both the specific compressive yield strength σ0.2% and the Vickers hardness HV of the lotus copper increase with increasing pass number of ECAE. The ECAE processed porous copper shows improved σ0.2% and HV comparable to those of the extruded nonporous copper. It is suggested that ECAE is a promising method to strengthen porous metals without significant pore closure.

KW - Equal-channel angular extrusion

KW - Lotus-type porous copper

KW - Porous metals

KW - Vickers hardness

KW - Yield strength

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Strengthening of lotus-type porous copper by ECAE process

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