(1. 北京有色金屬研究總院， 北京 100088;
2. 中國(guó)科學(xué)院 流體物理研究所 沖擊波物理與爆轟物理實(shí)驗(yàn)室，
綿陽(yáng) 621900)
摘 要: 采用超高壓沖擊波將納米銀粉固結(jié)為具有納米結(jié)構(gòu)的致密塊體材料。 采用X射線衍射和透射電子顯微鏡研究了試樣的顯微結(jié)構(gòu)。 不同沖擊波壓力（2.98～6.65GPa）下壓制的試樣的晶粒尺寸在50～120nm之間。 試樣中除了納米顆粒界面熔化并互相聯(lián)接形成的納米晶粒外，還出現(xiàn){111}孿晶結(jié)構(gòu)， 而每一片孿晶又由許多小的納米晶粒組成。 孿晶和位錯(cuò)運(yùn)動(dòng)是納米銀在超高壓沖壓波作用下形變的兩個(gè)重要特征。
關(guān)鍵字: 納米銀塊體；超高壓沖擊波；顯微結(jié)構(gòu)
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
