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Fabrication of Cu-Ni-Si alloy by melt spinning and its mechanical and electrical properties

机译：熔融纺丝制备Cu-Ni-Si合金及其机械和电学性能

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摘要

Cu alloys with compositions of Cu-3.2Ni-0.7Si (wt. %) and Cu-2.8Ni-0.7Si (wt. %) were prepared by melt spinning. Effects of composition, spinning rate, aging temperature and time on microstructure, precipitation of reinforcing phases, mechanical and electrical properties of Cu-Ni-Si alloys were investigated. Melt spinning could produce continuous Cu alloy ribbons with thickness and width of the ribbons mainly dependent on the cooling rate. Columnar grains of super-saturated Cu-Ni-Si solid solutions grew in the ribbons. The melt-spun Cu-Ni-Si alloys had a faster aging kinetics in comparison with commercial alloys of similar compositions. Peak-aging of the melt spun alloys appeared after heating at 400 to 550 ℃ for 1 to 2 h to show maximum tensile strength of 650 to 700 MPa. Prolonged heating resulted in large precipitates on the grain boundaries and formation of precipitation-free zones around each grain with sharp drop of tensile strength. Precipitation of nano δ-Ni_2Si rather than other phases was the main reason for the enhanced mechanical properties at peak-aging. The peak- and slightly over-aged ribbons had a good electric conductivity up to 55% IACS.
机译：通过熔融纺丝制备具有Cu-3.2Ni-0.7Si（重量％）和Cu-2.8Ni-0.7Si（重量％）组成的Cu合金。研究了组成，纺丝速度，时效温度和时间对Cu-Ni-Si合金微观结构，增强相的析出，力学性能和电性能的影响。熔融纺丝可以生产出连续的铜合金带，带的厚度和宽度主要取决于冷却速率。条带中生长了过饱和的Cu-Ni-Si固溶体的柱状晶粒。与类似组成的市售合金相比，熔纺Cu-Ni-Si合金具有更快的时效动力学。在400至550℃加热1至2 h后，熔体合金出现了峰值时效，显示出650至700 MPa的最大抗拉强度。长时间加热会在晶界上产生大量沉淀，并在每个晶粒周围形成无沉淀区，而抗拉强度会急剧下降。纳米δ-Ni_2Si而不是其他相的析出是峰值时效时机械性能增强的主要原因。峰值和略微老化的碳带具有良好的电导率，最高可达55％IACS。

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