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通过机械合金化制备Cu-5%C合金粉,并采用粉末冶金工艺制备铜碳合金增强铜-石墨复合材料即Cu-(Cu-5%C)-C,研究了制粉工艺和Cu-5%C合金粉对该复合材料显微组织及物理性能的影响。结果表明:随着球磨时间的增加,合金粉中铜的晶格常数先增大后减小,衍射峰强度不断降低,半高宽逐渐增大;球磨40h后合金粉中的石墨衍射峰消失,再经400℃退火3h则球磨产生的次生相Cu2O衍射峰消失,且石墨峰未复现。当石墨含量为4%,合金碳含量不超过1.5%时,Cu-(Cu-5%C)-C复合材料试样的电导率均达61%IACS以上;当合金碳含量为1.0%时,复合材料的屈服强度显著提高;当合金碳含量达到1.5%时,复合材料中的合金相严重分解,其增强效果大为减弱。
Cu-5% C alloy powder was prepared by mechanical alloying and Cu- (Cu-5% C) -C copper-carbon alloy reinforced Cu-Cu composite material was prepared by powder metallurgy. The effects of milling technology and Cu- % C alloy powder on the microstructure and physical properties of the composite. The results show that with the increase of ball milling time, the lattice constant of copper in alloy powders first increases and then decreases, the intensity of diffraction peaks decreases and the FWHM increases gradually. The diffraction peaks of graphite in alloy powders disappear after 40h milling, After annealing at 400 ℃ for 3h, the Cu2O diffraction peak of the secondary phase disappeared, and the graphite peak did not recur. The conductivity of Cu- (Cu-5% C) -C composites reached 61% IACS when the graphite content was 4% and the alloy carbon content was less than 1.5%. When the content of carbon was 1.0% The yield strength of the composite material significantly increased; when the alloy carbon content reaches 1.5%, the alloy phase in the composite material is severely decomposed, and the reinforcing effect is greatly weakened.