摘要
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 the related electric conductivity of Cu-Co-Be alloy in the process of solution and the ageing treatment were investigated. Then the age-hardening mechanism was studied by means of XRD, TEM. The results show that the optimum ageing treatment for Cu-Co-Be alloy is solution-treated at 920℃ for 1 b and aged at 450℃for 4 h. The effects of cobalt in the alloy can depress the forming of Guinier-Preston（G-P） zones, delay the precipitation of γ′ phase, meanwhile it can prevent the reaction in grain boundary, so it can improve the mechanical properties of Be-bronze. The transformation kinetics equation at 450℃ aging temperatures was educed from the Avrami empirical formula.
出处
《金属热处理》
CAS
CSCD
北大核心
2009年第5期14-17,共4页
Heat Treatment of Metals
