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It has been revealed, that in Ir subjected to severe plastic deformation, an ultrafine grained structure (UFG) is formed (the grain size of 20-30 nm). Practically no defects have been detected within the grains, while, in the case of Ar+ implantation, the subgrain structure with characteristic sizes of about 3-5 nm is formed; defects have been detected within subgrains.The subgrain structure was also revealed in UFG Ni and Cu after severe plastic deformation (SPD) (subgrain size of 3-15 nm), but in the latter case the observed boundary region is broader and subgrain is highly disoriented. 相似文献
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V. P. Vlokh 《Soil Mechanics and Foundation Engineering》1992,29(4):124-125
An effective method of pile sinking by the bored-driven and bored-drop methods is described, which reproduces in the section the shape of sunk piles. This prevents formation of the hollows created during sinking of piles into circular holes, which must be filled with grout.Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 4, pp. 22–23, July–August, 1992. 相似文献
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On the basis of studies of the piezo-optic effect, it has been shown that SrB(4)O(7) crystals can be used as efficient acousto-optic materials in the vacuum ultraviolet spectral range. The full matrices of piezo-optic and photoelastic coefficients have been experimentally obtained for these crystals. The acousto-optic figure of merit and the diffraction efficiency have been estimated for both the visible and deep ultraviolet spectral ranges. 相似文献
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Martynyuk-Lototska IY Mys OG Grabar AA Stoika IM Vysochanskii YM Vlokh RO 《Applied optics》2008,47(1):52-55
We have studied the acousto-optic (AO) diffraction in Sn2P2S6 crystals and found that they manifest high values of an AO figure of merit. The above crystals may therefore be used as highly efficient materials in different AO applications. 相似文献
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