摘要
采用中频熔炼-铸造-热轧-固溶-冷轧-时效处理工艺制备了Cu-Ag-Cr合金。通过拉伸力学性能测试、硬度测试和透射电子显微镜观察,研究了微量Cr和Ag对固溶-预冷变形-时效合金组织和性能的影响,探讨了Cu-Ag-Cr合金的主要强化机制,并用理论计算来预测Cr对合金屈服强度的增量。结果表明:微量Ag在Cu-0.1Ag-0.5Cr合金中主要以固溶形式存在,微量Cr在时效态Cu-0.1Ag-0.5Cr合金中主要以单质Cr粒子形式存在,Cr粒子的尺寸约为几个到十几个纳米,呈现共格畸变产生的豆瓣状析出相衬度,与基体共格,冷轧后时效态组织中有部分保留的位错亚结构。细小弥散分布的析出相质点能够强烈地钉扎位错,对形变组织中的亚结构具有稳定作用,阻碍位错运动和亚晶界的合并,从而使合金中仍能保持较高的位错密度,延缓回复过程和再结晶形核的开始。Cu-0.1Ag-0.5Cr合金的强化机制是Ag的固溶强化、预冷变形引入的亚结构强化和Cr粒子的析出强化。理论计算的屈服强度增量,与实验测试的Cu-Ag-Cr合金屈服强度增量很接近,计算值与实测值相差5.5%。Cr的析出强化量可以由计算近似得到。
Cu-Ag-Cr alloy was prepared by intermediate frequency melting-swage foundry-hot rolling-solution-cold rolling-aging process.The effects of minim Cr and Ag on structure and properties of the solution-cold rolling-aging alloy were studied by using tensile test,hardness test and TEM analysis.The relation between the quantity of Cr and yield strength was established.The results showed that addition of trace amount Ag existed mainly in solid solution while that of Cr as singly Cr particles.The dimension of Cr pa...
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2010年第6期828-832,共5页
Chinese Journal of Rare Metals
基金
国家自然科学基金项目(50371106)资助
