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研究了Cu-Co-Be合金固溶和时效处理的硬度和电导率的变化,通过XRD、TEM等手段对其时效强化机制进行了探讨。研究结果表明,Cu-Co-Be合金的最佳热处理工艺为920℃固溶1h后,再450℃时效4h。合金中Co的加入抑制了G.P.区的形成,推迟了γ′的析出;同时也抑制了晶界反应,大大改善了铍青铜的性能。根据Avrami相变动力学经验方程,推导出了合金在450℃时效的相变动力学方程。
The changes of hardness and electrical conductivity of Cu-Co-Be alloy after solution treatment and aging treatment were studied. The mechanism of aging strengthening was discussed by means of XRD and TEM. The results show that the optimum heat treatment process of Cu-Co-Be alloy is solution treatment at 920 ℃ for 1h and then at 450 ℃ for 4h. The addition of Co in the alloy suppresses the formation of G.P. zone, postponing the precipitation of γ ’, and also inhibits the grain boundary reaction and greatly improves the properties of beryllium bronze. According to the empirical equation of Avrami phase transition kinetics, the phase transformation kinetics equation of the alloy at 450 ℃ is deduced.