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Precipitation hardening of Cu-4Ti-1Cd alloy

机译：Cu-4Ti-1Cd合金的沉淀硬化

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摘要

Precipitation hardening of Cu-4Ti-1Cd alloy has been studied using hardness measurements and transmission electron microscopy. This alloy exhibited hardness of 238 Hv in solution treated (ST) condition and attained peak hardness of 318 Hv after ageing at 450°C for 40 h. Electrical conductivity of Cu-4Ti-1Cd alloy increased from 5.7 %IACS (International Annealed Copper standard) in ST condition to 8.9 %IACS on ageing at 450°C for 16 h. This alloy exhibited markedly higher yield strength (751 MPa in the peak-aged condition) compared to Cu-4.5Ti alloy but the increase in UTS due to cadmium addition was less significant. The higher yield strength of ternary alloy in peak aged condition is due to the solid solution strengthening of cadmium as well as the presence of β′-Cu4Ti precipitate. On over-ageing the alloy showed a decrease in hardness as a result of formation of equilibrium precipitate, β-Cu3Ti. Optical microscopy reveals single phase with equiaxed grains in solution treated condition. A coherent, metastable phase β′-Cu4Ti is responsible for high strength and hardness in peak aged condition. The over-ageing in this alloy shows the formation of cellular structure at the grain boundaries of the matrix phase.
机译：使用硬度测量和透射电子显微镜研究了Cu-4Ti-1Cd合金的沉淀硬化。该合金在固溶处理（ST）条件下显示出238 Hv的硬度，并在450°C时效40 h后达到了318 Hv的峰值硬度。 Cu-4Ti-1Cd合金的电导率从ST条件下的5.7％IACS（国际退火铜标准）提高到在450°C时效16 h时的8.9％IACS。与Cu-4.5Ti合金相比，该合金具有明显更高的屈服强度（在峰值时效条件下为751 MPa），但由于添加镉而导致的UTS升高幅度不大。在峰值时效条件下，三元合金具有较高的屈服强度，这归因于镉的固溶强化以及存在β'-Cu4 Ti沉淀。过度时效后，由于形成了平衡析出物β-Cu3 Ti，硬度降低了。光学显微镜显示在固溶处理条件下具有等轴晶粒的单相。相干的亚稳态相β'-Cu4 Ti在峰值时效状态下具有较高的强度和硬度。该合金的过时效表明在基体相的晶界处形成了孔结构。

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  • 来源
    《Journal of Materials Science》 |2004年第5期|1579-1587|共9页
  • 作者

    R. Markandeya; S. Nagarjuna; D. S. Sarma;

  • 作者单位

    Department of Metallurgical Engineering Institute of Technology BHU;

    Defence Metallurgical Research Laboratory;

    Department of Metallurgical Engineering Institute of Technology BHU;

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