EB-PVD制备纳米层间距多层材料的力学行为研究

K18/Mo、Fe/Cu、Fe/Ni、Cu/Co nano-multilayers and nano granular films were prepared by EB-PVD method and their mechanical, magnetic, electrical properties and their thermal stability have been studied in detail. It has been found that the tensile strength for the Fe/Cu multilayers was 4times higher than that of pure metallic materials. Moreover, the tensile strength increased with decreasing layer thickness, following Hall-petch relation. When the thickness decreased to a critical value, however, the tensile decreased as layer thickness was further reduced. The result was ascribed by the increase of atomic space at the interfaces.It is also discovered that the Fe/Cu nano-multilayers prepared in this work was stable in regard with their multiplayer structure even at high temperature 950℃ and 1100℃, and the lyer thickness remained nearly unchanged. What is more, a overheating phenominum was observed, which was influenced by the layer thickness. Study of magnetic and electrical properties for the nanomultilayers has shown that coercivity was reduced to 0.8 Oe due to magnetic coupling.In addition, those properties were intimatedly link with internal stress and grain size..

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