Journal
MATERIALS CHARACTERIZATION
Volume 170, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2020.110642
Keywords
Copper alloys; Bimodal structure; Normal precipitation; Discontinuous precipitation; Strength electrical conductivity
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Funding
- Global Frontier R&D Program on Global Frontier, Hybrid Interface Materials R&D Center - Ministry of Science [NRF-2014M3A6B1060886]
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2020M3D1A2098962, 2020R1A5A6017701, 2018R1A5A6075959]
- National Research Foundation of Korea [2020M3D1A2098962] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The discontinuous precipitation (DP) was known to mechanically detrimental mechanism compared to normal precipitation (continuous precipitation, CP), while the DP has the higher conductivity because of low solute content in matrix. To get the optimum balance of strength and conductivity, the bimodal-structured Cu-4Ni-1Si alloy composed of two regions with CPs and DPs was fabricated. Bimodal-structured alloy occupied by 50% of each region shows remarkable high strength and conductivity combination (1088 MPa / 38%IACS) beyond the expected values which summated in alloys with fully CP or DP. The accelerated strengthening of bimodalstructured alloy is caused by uni-directional alignment and enhanced plastic deformation of DPs in alloy after cold-working.
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