The effect of bimodal structure with nanofibers and normal precipitates on the mechanical and electrical properties of Cu-Ni-Si alloy

초록

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.

키워드