塑性加工对AgNi合金组织结构和性能的影响

Effect of Plastic Processing on the Microstructure and Properties of Ag-Ni Alloy

采用扫描电镜观察、物理力学性能测试以及电性能实验等手段,研究了未经退火处理的挤压态、二次拉拔态和六次拉拔态三种加工硬化态AgNi合金的微观组织结构与性能的变化规律。结果表明,AgNi合金的抗拉强度、硬度以及触点电寿命随塑性变形(加工道次)程度的增加而增加,延伸率随塑性变形程度的增加而降低,合金中Ni弥散相的弥散度和长径比随塑性变形程度的增加而增加,但是六次拉拔态合金中Ni弥散相出现了明显的裂纹。

Through tensile testing, scanning electron microscopy and electrical life test, we studied the evolution of the microstructure and properties of AgNi alloys in three processing hardening states, such as extruded state, the second drawing state and the sixth drawing state. The result shows that, with the increase of degree of plastic deformation （processing lane）, not only tensile strength, hardness and electrical life of AgNi alloys, but also the dispersion degree and aspect ration of Ni phase increase, instead the elongation decreases, However, Ni phase of alloy of the sixth drawing state has obvious cracks.