(1. 北京有色金属研究总院， 北京 100088;
2. 中国科学院 流体物理研究所 冲击波物理与爆轰物理实验室，
绵阳 621900)
摘 要: 采用超高压冲击波将纳米银粉固结为具有纳米结构的致密块体材料。 采用X射线衍射和透射电子显微镜研究了试样的显微结构。 不同冲击波压力（2.98～6.65GPa）下压制的试样的晶粒尺寸在50～120nm之间。 试样中除了纳米颗粒界面熔化并互相联接形成的纳米晶粒外，还出现{111}孪晶结构， 而每一片孪晶又由许多小的纳米晶粒组成。 孪晶和位错运动是纳米银在超高压冲压波作用下形变的两个重要特征。
关键字: 纳米银块体；超高压冲击波；显微结构
bulk nanostructured silver
（1. Beijing General Research Institute for Nonferrous Metals,
Beijing 100088, China;
2. Laboratory for Shock Wave and Detonation Physics Research，
Institute of Fluid Physics，The Chinese Academy of Science，
Mianyang 621900，China）
Abstract:Pure silver nanopowder was consolidated by ultra high pressure shock wave, and the dense sample with nanograins was obtained by explosive compaction. The microstructure was investigated by X-ray diffraction and TEM analysis. The grain sizes of bulk Ag samples are 50~120nm under different shock wave pressure from 2.98 to 6.65GPa. Besides nanoscale grains there are {111}twins in samples. In each twin, lots of nanograins are observed. Twins and dislocation movement are two important deformation characteristics of silver nanopowder under high pressure shock wave.
Key words: bulk nanostructured silver; high pressure shock wave; microstructure
