大塑性变形Ag-20Cu复合丝材各相变形特征  

Deformation Characteristics of Metal Clad Metal Ag-20Cu Macro-Composite by Severe Plastic Deformation

作　　者：耿永红[1] 郭迎春[1] 毕珺[1] 张吉明[1] 王传军[1] 陈松[1] 管伟明[1] 张昆华[1] 

机构地区：[1]昆明贵金属研究所,云南昆明650106

出　　处：《稀有金属材料与工程》2010年第4期697-701,共5页Rare Metal Materials and Engineering

基　　金：云南省科研院所技术开发研究专项(2002KFZX-31);云南省中青年学术带头人后备人才项目(2006py01-42)

摘　　要：采用包覆法制备了Ag-20Cu(体积分数,%,下同)复合材料初始锭坯,热挤压成复合线材,再通过冷拉拔大变形制得Ag-20Cu复合丝。分别测量了不同真应变η下复合丝材的力学性能;通过扫描电镜测量不同真应变η下Ag和Cu两相尺寸变化,观察了其断裂形貌。通过上述实验研究了变形过程中Ag-20Cu复合材料的各相变形特征。研究结果表明:变形过程中,由于复合材料各组成相的力学性能不同,Ag和Cu两相发生协调变形,且不同变形阶段两相的协调变形方式不同;由于各相在变形过程中存在不同程度的加工硬化和回复,不同的变形阶段,复合材料的性能变化趋势不同,各相对复合材料性能的影响也不相同。Ag-20Cu macro-composite wires （volume fraction, %, similarly hereinafter）, a new DMMCs（Deformation Metal-Metal Composites）, were fabricated by metal clad metal method and post-severe plastic deformation. The mechanical properties of the composite wires were tested at different true strains η, and the size change of the Ag layer and the Cu layer and fracture morphology were observed by SEM. The deformation characteristics of the Ag layer and the Cu layer for the Ag-20Cu composite were studied by the above experiments. The results indicate that the deformation process of the composite mainly contains cooperating deformation between Ag and Cu layers due to their different mechanical properties and the modes of cooperating deformation at different stages are different. Because of work-hardening and recovery to different degrees during deformation, the property change trend of the composite is different and the effects of Ag and Cu layers on the properties of the composites are unlike.

关 键 词：金属基复合材料 Ag基复合材料 大塑性变形 形变特征 

分 类 号：TB331[一般工业技术—材料科学与工程]