形变热处理对烧结Cu-Au合金性能与微观组织的影响

摘要

研究Cu-4%Au合金的硬度、显微硬度、导电性和微观组织在形变热处理过程中的变化。在加工硬化后，再对轧制合金在60~350°C温度下退火。由于退火硬化效应，合金的强度增大。结果表明：Cu-Au合金性能在两个阶段都得到改善；合金进行变形量为40%的热轧后，在260°C退火能得到最佳的综合性能。合金的微观组织也在形变热处理过程中发生显著变化。%The changes in hardness, microhardness, electrical conductivity and microstructure of the sintered Cu-4%Au (mole fraction) alloy during thermomechanical treatment were studied. Following the primary strain hardening, an annealing of rolled alloy in the temperature range of 60-350 °C provided additional strengthening due to the anneal hardening effect. An increase in properties took place in two stages, and the best combination of properties was achieved in the alloy pre-rolled with 40% reduction after annealing at 260 °C. Significant microstructural changes followed the changes of properties in the course of the thermomechanical treatment.