Papers by Keyword: Interface Width

Abstract: Investigation at micro- and nano-scale is beneficial for the fundamental study of cement-based material as an extremely complex composite. This paper presents a preliminary exploration on the unhydrated cement grain/ C-S-H gel interface using nano-scratch technique. By comprehensive analysis of the penetration depth, the coefficient of friction, and the elastic deformation ratio, the interfacial width of different w/c ratio and curing age were obtained, which shows a tendency to increase with the curing age in the range of 1-4 um, while has no relation to the w/c ratio.

Abstract: Fe/Cu nanometer-scale multilayers with nominal modulation wavelengths ranging from 5 to 40 nm are deposited by direct current magnetron sputtering on Si (100) substrates. Modulation structures of the multilayers are examined by small angle / wide angle x-ray diffraction (SA/WAXRD) and cross-sectional transmission electron microscopy (XTEM). Hardness of the multilayers is measured by using nanoindentation. All the multilayers have Fe (110) and Cu (111) textures. Interface coherency is observed in the multilayers with designed modulation wavelengths of 5 and 10 nm. The hardness increases firstly and then deceases with increasing the modulation wavelength, and reaches peak value of 7.29±0.29 GPa in the multilayers with nominal modulation wavelength of 10 nm. The evolution of the hardness of the mulitlayers is explained by interface width and modulus difference between sublayers.