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采用OM,TEM,SEM/EBSD及硬度测试等手段,研究了微量Fe对冷轧Cu-30Zn-0.15Fe合金在573 K下等温退火过程中组织演化的影响.结果表明,Fe与合金中的杂质P形成hcp结构的Fe_2P第二相颗粒,其粒子尺寸为50~300 nm.冷轧Cu-Zn和Cu-Zn-Fe合金的硬度曲线在退火过程中均分为3个阶段,后者与前者相比第二阶段出现较晚.当硬度趋于稳定时,Cu-Zn-Fe合金的硬度比Cu-Zn合金提高约30 HV.Fe2P粒子阻碍晶界迁移和位错运动,使得Cu-Zn-Fe合金退火过程中的Σ3孪晶界的增加速度缓慢、质量分数减少,组织内位错密度、储能较大.Fe2P粒子延迟了Cu-Zn-Fe合金再结晶的发生并抑制再结晶晶粒长大,使其平均晶粒尺寸保持在1.3μm左右.合金的主要强化机制为第二相强化、细晶强化和位错强化.
The effects of trace Fe on the microstructure evolution of the cold-rolled Cu-30Zn-0.15Fe alloy during isothermal annealing at 573 K were investigated by means of OM, TEM, SEM / EBSD and hardness test. The results show that Fe and the impurities in the alloy P formed hcp structure of Fe 2 P second phase particles, the particle size of 50 ~ 300 nm.The hardness curve of cold-rolled Cu-Zn and Cu-Zn-Fe alloy during the annealing process are divided into three stages, the latter with the former Compared with the second stage, the hardness of Cu-Zn-Fe alloy is about 30 HV higher than that of Cu-Zn alloy when the hardness tends to be stable.Fe2P particles obstruct the grain boundary migration and dislocation movement, making Cu-Zn- The Σ3 twin boundaries in Fe alloy annealed slowly, the mass fraction decreased, the dislocation density in the microstructure and the energy storage were larger, and Fe2P particles delayed the recrystallization of Cu-Zn-Fe alloy and inhibited the recrystallization grain Grew up, the average grain size remained at about 1.3μm.The main strengthening mechanism of the alloy for the second phase strengthening, fine grain strengthening and dislocation strengthening.