论文标题
纳米原子的合成增强银基质纳米复合材料：微结构和机械性能
Synthesis of nanodiamond reinforced silver matrix nanocomposites: microstructure and mechanical properties
论文作者
论文摘要
具有不同纳米座含量的纳米座增强银基质基质纳米复合材料是通过两种严重的塑性变形方法，磨球和高压扭转（HPT）的组合，由纯银和纳米座粉末产生。球铣削参数各不相同，以改善粉末混合物中纳米座的分布。已经开发了一种优化的处理途径，以实现纳米晶体银基质中的小纳米座颗粒的同质分散。这些纳米复合材料的显微结构以扫描和透射电子显微镜为特征。机械性能的特征是微硬度测量和拉伸测试。越来越多的纳米符号（分别高达5 wt％和15 vol％）可以将微硬度提高高达70％，而拉伸强度则提高了HPT变形纯银所达到的值的60％。显微硬度和拉伸强度比微晶纯银高约5倍。
Nanodiamond reinforced silver matrix nanocomposites with different nanodiamond content are produced from pure silver and nanodiamond powders by a combination of two severe plastic deformation methods, ball-milling and high-pressure torsion (HPT). The ball milling parameters are varied to improve the distribution of the nanodiamonds in the powder blends. An optimized processing route combining both processes has been developed to achieve a homogenous dispersion of small nanodiamond particles in a nanocrystalline silver matrix. The microstructure of these nanocomposites was characterized by scanning and transmission electron microscopy. The mechanical properties were characterized by microhardness measurements and tensile tests. An increasing amount of nanodiamonds (up to 5 wt% and 15 vol%, respectively) can raise the microhardness by up to 70 % and the tensile strength by up to 60 % of the values achieved in HPT deformed pure silver. The microhardness and tensile strength is about 5 times higher than microcrystalline pure silver.
