Influence of Co on Strength and Microstructure of Cu-Ni-Co-Si Alloy

• IZAWA Kotaro

  Graduate Studeent, Div. of Mech. Sci. and Eng., Kanazawa Univ.

• OZAWA Atsushi

  Graduate Studeent, Div. of Mech. Sci. and Eng., Kanazawa Univ.

• KITA Kazuhisa

  Div. of lnnovation Tech. and Sci., Kanazawa Univ.

• WATANABE Chihiro

  Div. of lnnovation Tech. and Sci., Kanazawa Univ.

• MONZEN Ryoichi

  Div. of lnnovation Tech. and Sci., Kanazawa Univ.

Bibliographic Information

Other Title

• Cu-Ni-Co-Si合金の強度と組織に及ぼすCoの影響
• Cu-Ni-Co-Si ゴウキン ノ キョウド ト ソシキ ニ オヨボス Co ノ エイキョウ

Abstract

Cu-2.0wt%Ni-0.5wt%Si, Cu-1.4wt%Ni-0.6wt%Co-0.5wt%Si (0.6%Co) and Cu-1.0wt%Ni-1.0wt%Co-0.5wt%Si (1.0%Co) alloys produced by combining cold rolling to a 25% and a 90% reduction with aging treatment are employed to investigate the effects of Co on the strength and microstructure of Cu-Ni-Co-Si alloys. Aging the 0.6%Co and 1.0%Co alloys at 525, 425 and 325℃ produces orthorhombic (Ni, Co)₂Si precipitates that have the same crystal system as Ni₂Si precipitates formed in the 0%Co alloy. The larger the amount of Co in the three alloys is, the higher the dislocation density in the alloys peak-aged and rolled to a 25% and a 90% reduction is. The amounts of deformation twins observed in the 0.6%Co and 1.0%Co alloys peak-aged at 525℃ and rolled to a 90% reduction are much larger than that observed in the 0%Co alloy peak-aged at 525℃ and rolled to a 90% reduction. The strength and electrical conductivity of the three alloys initially aged at 525℃, rolled to a 25% reduction and re-aged at 425℃ (A25RA), or aged at 525℃, rolled to a 90% reduction and re-aged at 325℃ (A90RA) becomes higher as the Co content increases. The increase in strength with increasing the Co content is attributed to decrease in the inter-precipitate spacing and increase in the dislocation density for the A25RA alloys, and increase in the amount of deformation twins in addition to decrease in the inter-precipitate spacing and increase in the dislocation density for the A90RA alloys.

Journal

• Journal of the Society of Materials Science, Japan

  Journal of the Society of Materials Science, Japan 63 (5), 401-408, 2014

  The Society of Materials Science, Japan

Keywords

• Copper-nickel-cobalt-silicon alloy
• Aging
• Cold rolling microstructure
• Strength
• Deformation twin
• Dislocation density

Details

• CRID: 1390282680421640448
• NII Article ID: 130004749897
• NII Book ID: AA11556898
• DOI: 10.2472/jsms.63.401
• ISSN: 18807488
• ISSN: 05145163
• NDL BIB ID: 025547106
• Web Site: http://hdl.handle.net/2297/41385
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I025547106
• Text Lang: ja
• Data Source:
  • JaLC
  • IRDB
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed