固溶时效对上引拉铸Cu-0.3Cr-0.1Zr组织性能的影响

用扫描电镜(SEM)、透射电子显微镜(TEM)、涡流电导率测量仪和万能试验机测试分别测量了上引拉铸拉拔之后固溶时效对Cu-0.3Cr-0.1Zr合金抗拉强度及导电率性能的影响,用金相显微镜观察不同拉拔加工率下固溶的显微组织.并探讨了合金的强化机理.结果表明:上引Cu-0.3Cr-0.1Zr合金铸锭经过75％冷拉变形后固溶其组织和力学性能较好.经时效后的固溶态Cu-0.3Cr-0.1Zr合金,抗拉强度和导电率迅速上升,随着时间时间的延长,其抗拉强度达到峰值后呈下降趋势,而导电率则继续上升.Cu-Cr-Zr合金析出强化的重要因素是大量共格弥散的析出相,以共格强化机制估算的强化值423MPa与实验结果415MPa相近.

Effect of Solution and Aging Technology on Microstructure and Properties of Pullingmethod Cu - 0.3 Cr - 0.1 Zr Alloy

A series of experiments was performed for studying on the effects of different temperature levels of solution heat treat- ment and solution - aging heat treatment in the range between 400600℃ on the micro - morphology, physical properties, mechanical properties and strengthening mechanism of the Cu -0.3Cr- 0.1Zr alloy, by using scanning electron microscopy （SEM） , transmission electron microscopy （TEM） , the eddy conductivity meter and universal testing machine test. The alloy organization under different de- formation of solution treatment was analyzed with metallographic microscope, and the alloy tensile fracture morphology also was ana- lyzed. The results show the microstrueture and mechanical properties after 75% cold - drawn deformed of Cu -0.3Cr -0.1Zr alloy were well. The initial tensile strength and electrical conductivity increase rapidly after different solution - aging process. Tensile strength slow declines after reach the peak, while the electrical conductivity continues to rise. The important precipitation strengthening factor is the large number of grid dispersion of precipitated phase, in coherent strengthen the mechanism for the strengthening of the es- timate value of 423 MPa close to experimental results of 415 MPa.