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 scanning 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.
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