深冷处理对纯银组织与性能的影响

Effect of Cryogenic Treatment on the Microstructure and Properties of Ag Wire

采用深冷处理工艺,系统研究直径1.772 mm纯银显微组织、力学性能及电导率的变化。实验表明深冷处理后纯银晶粒尺寸与形貌并未发生显著变化,但其显微硬度由初始65.8 Hv增加至68.9 Hv,电导率由初始99.45%IACS增至101.28%IACS。X射线衍射仪分析得出,纯银经深冷处理后晶向峰值(220)、(311)均增强,组织均匀性得以提升,各晶向的半高宽产生一定程度降低。通过分析晶粒尺寸变化,得出半高宽值的降低主要由于深冷处理诱导微观应变的减小,而这有利于电导率的提升。

The microstructure,mechanical properties and conductivity of pure silver wire with a diameter of 1.772 mm were systematically studied by cryogenic treatment.Experiments showed that the microstructure of pure silver wire was not changed after cryogenic treatment,but with a surface microhardness change increased from 65.8 Hv to 68.9 Hv and the conductivity also increased from 99.45%IACS to 101.28%IACS compared with the original sample.The X-ray diffraction analysis shows that after deep cooling treatment,the peak values(220)and(311)in the crystal direction of pure silver are enhanced,and the uniformity of the structure is improved.The half width at half maximum of each crystal direction is reduced to a certain extent.By analyzing the changes in grain size,it was found that the decrease in half width is mainly due to the reduction of microstrain induced by deep cooling treatment,which is beneficial for improving conductivity.