(1. 浙江大学 材料科学与工程系， 杭州 310027;
2.中国兵器工业52研究所宁波分所， 宁波 315041)
摘 要: 用惰性气体冷凝和真空原位温压方法成功地制备了大尺寸具有清洁界面的纳米铜和银块材。其尺寸分别为d 80 mm×5mm和d 80 mm×7.8 mm， 平均晶粒度为36 nm和52 nm， 相对密度为94.3%和97%。纳米铜的微空隙尺寸稍大， 但数量较少； 纳米银的微孔隙孔径为16.5～18nm，数量极少。 纳米铜和银的显微硬度分别是多晶粗晶铜和银的6倍和2倍。纳米铜的弹性模量、 屈服强度、 断裂强度和延伸率分别为多晶粗晶铜的0.65， 1.42， 1.82和0.15倍。
关键字: 大尺寸纳米金属； 微空隙； 力学性能
（1. Department of Materials Science and Engineering，Zhejiang University， Hangzhou 310027， P.R.China;
2. Ningbo Division, No.52 Research Institute of China Ordnance Industry， Ningbo 315041, P.R.China）
Abstract:The large diskshaped bulk nanocrystalline copper( n Cu) and silver ( nAg)， with diameter of 80 mm， thickness of 5 mm and 7.8 mm， as well as average grain size of 36 nm and 52 nm， respectively， were successfully synthesized by an inert gas condensation and insitu warm compacting technique. The relative densities of n Cu and n Ag are 94.3% and 97%, respectively. Thesize and amount of the vacancies and microvoidsin n Cu are similar to those of other nanocrystalline materials (nonoFe,and -TiO2) prepared by inert gas condensation and insitucompaction technique. However， the size of microvoidsin n Cu is larger than that of nanoFe， and TiO2， but the amount of them is quite less than that of nanoFe， and TiO2. The size of pores in n Ag is in the range of 16.5～18nm, but the amount of them is quite small. The microhardnesses of n Cu and n Ag are 6 and 2 times of that of coarsegrained polycrystalline metals copper ( p Cu) and silver (pAg). The elastic modulus， tensile yield stress， fracture stress， and elongation of n Cu are 0.65， 1.42， 1.82 and 0.15 times of that of p Cu， respectively.
Key words: large bulk nanocrystalline metal; microvoids; mechanical properties
