摘要
采用包覆-挤压-拉拔法制备了Ag-20Cu(质量分数,下同)形变宏观复合材料丝材。测试了不同变形量下Ag-20Cu复合丝材的极限抗拉强度、各相的显微硬度,扫描电镜测量了各相的尺寸,研究了变形过程中Ag-20Cu复合丝材力学性能的变化规律。结果表明,由于形变引起复合材料内部各相发生不同程度的加工硬化和回复,复合材料的力学性能随变形量的增加表现出不同的变化趋势,低应变阶段,由于各相的加工硬化和位错在复合界面处塞积,其力学性能随变形量的增大而增大;高应变阶段,主要由于基体Ag相的回复效应,其力学性能随变形量的增加而减小。
The deformation processed Ag- 20Cu （wt%） macro- composites were fabricated by metal cladding , post - extruding and then cold - drawing. The mechanical properties of the composite wires were tested and the dimensions of Ag and Cu layers were measured quantitatively depending on the scan- ning electron microscopic images. The effects of deformation on the mechanical properties of Ag- 20Cu wires were investigated. The results indicated that the mechanical properties increase at low strain stage because of the work - hardening of Cu layers and pile - up of dislocation at the interface and decrease at high strain stage mainly due to the recovering of Ag layers.
出处
《贵金属》
CAS
CSCD
北大核心
2009年第4期13-17,共5页
Precious Metals
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)
关键词
金属材料
形变金属基复合材料
宏观复合材料
大塑性变形
力学性能
metal materials
deformation processed metal - metal composites
macro - composites
severe plastic deformation
mechanical properties
