摘要
研究了粉末冶金熔渗烧结法制备的CuW80/Cu整体式触头材料尾部铜经挤压变形后硬度的变化规律,并用三维视频显微镜和透射电镜进行显微组织结构分析。结果表明:尾部铜经挤压变形后,硬度显著提高,增幅约200%,挤压工艺是CuW80/Cu整体式触头材料尾部铜强化处理的有效手段。尾部铜沿横截面从芯部到表面,越接近表面,其硬度值越大;沿纵截面,从CuW80/Cu界面到末端,硬度提高。即使挤压变形很小,尾部铜仍产生了位错缠结,挤压严重部分产生大量位错胞组织。
The extrusion strengthening of the copper being in the tail of CuW80/Cu integrated contact material, which was prepared by powder metallurgy sintering, was investigated. Microhardness of the copper after extrusion was measured along longitudinal and horizontal sections, and correspondingly, microstructure was observed by three-dimension video microscopy and transmission electron microscopy （TEM）. The hardness of the copper increased remarkably after extrusion, which was 200% higher than that before extrusion, indicating that extrusion was one of the efficient ways to strengthen the copper in the tail of CuW80/Cu integrated contact material. In horizontal sections, the hardness of copper after the extrusion increased from inner to surface, while in longitudinal sections, the hardness of copper after the extrusion increased far away from interface of CuW80/Cu. The results of TEM observation showed that there were still some dislocation tangles even though the extrusion was small, and cell dislocation structures formed after serious extrusion.
出处
《机械工程材料》
CAS
CSCD
北大核心
2007年第4期43-47,共5页
Materials For Mechanical Engineering
基金
福建省产学研基金(闽产学研[2004]02-1)
