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排序方式: 共有231条查询结果,搜索用时 453 毫秒
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N. N. Kuranova D. V. Gunderov A. N. Uksusnikov A. V. Luk’yanov L. I. Yurchenko E. A. Prokof’ev V. G. Pushin R. Z. Valiev 《The Physics of Metals and Metallography》2009,108(6):556-568
Effect of annealing on the structural and phase transformations and mechanical properties of large-size samples of the Ti49.4Ni50.6 alloy preliminary subjected to severe plastic deformation by torsion under a high pressure (HPT) is studied. The study was
performed by transmission and scanning electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, and measurements
of mechanical properties. The annealing was found to result in the nanocrystallization of initial samples amorphized by HPT.
In this alloy, the high-strength uniform nanostructured state is formed the size of nanocrystalline grains of which and the
mechanical properties depend on the temperature and time of annealing. 相似文献
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K. A. Valiev R. V. Goldstein Yu. V. Zhitnikov T. M. Makhviladze M. E. Sarychev 《Russian Microelectronics》2010,39(3):145-157
The degradation and bulk failure of a polycrystalline interconnect line caused by vacancy electromigration along grain boundaries
and vacancy-cluster nucleation at triple points in the bulk conductor are investigated within the general theory of the electromigration-induced
degradation and failure of thin-film on-chip interconnect lines, presented in Part 1 [1]. The general equations are tailored
to deal with vacancy electromigration, mechanical-stress generation, and void nucleation at triple points. Appropriate boundaryvalue
problems are formulated, and numerical methods and procedures to solve them are developed and implemented in software. Computer
simulations are performed to identify a pattern of electromigration failure at triple points. On this basis, (1) interconnect
lifetime is investigated over wide ranges of variation of material, structural, geometric, and operating parameters, and (2)
the current-density and temperature dependence—of the mechanical stress, vacancy concentration, and level of vacancy supersaturation
at a triple point, and of void radius and time to nucleation-is examined and explained. The simulation results are found to
agree well with previous experiments. This investigation could be seen as a natural continuation of our study of electromigration
failures developed by multilevel-metallization systems as a result of interconnect failure near via junctions or at open ends
[1]. Together they cover most mechanisms of electromigration failure suffered by metallization systems. 相似文献
26.
R.Z. Valiev 《Advanced Engineering Materials》2003,5(5):296-300
Severe plastic deformation (SPD) can lead to emergence of microstructural features and properties in materials which are fundamentally different from the ones well known for conventional cold deformation. In particular, the instances of unusual phase transformations resulting in development of highly metastable states associated with formation of supersaturated solid solutions, disordering or amorphization and their further decomposition during heating, high thermal stability of the SPD‐produced nanostructures, and the paradox of strength and ductility in some SPD‐processed metals and alloys are discussed. 相似文献
27.
A review of the principles of operation of quantum computers and their elements is presented. The radical advantage of quantum
algorithms for processing information over the classical ones is discussed, quantum entanglement is considered as the basic
resource of quantum computations, and the most promising and interesting proposals on realization of quantum computers on
the basis of trapped ions, nuclear spins, quantum dots, superconducting structures, and others are described. This review
reflects the materials of the report presented at the scientific session of the Department of Nanotechnologies and Information
Technologies of the Russian Academy of Sciences on February 25, 2010. 相似文献
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A. A. Geidarov M. M. Akhmedov M. A. Karimov B. S. Valiev S. G. Efendieva 《Russian Metallurgy (Metally)》2009,(6):469-472
A powder dissolution method is used to study the kinetics of leaching of lead sulfate from a lead cake in the temperature
range 298–353 K and the concentration range 50–270 g/l of a sodium chloride solution. The results obtained are used to calculate
the apparent activation energy (E
a = 12.41 kJ/mol); its value indicates that the process of leaching of lead sulfate from a lead cake occurs in a diffusion
zone. This process is shown to be described by a first-order kinetic equation. 相似文献
30.
U. Sh. Shayakhmetov I. M. Valiev K. A. Vasin R. S. Malikov 《Refractories and Industrial Ceramics》1999,40(11-12):499-502
Results of high-temperature creep tests of alumosilicate concretes on a phosphate binder that consists of a mixture of electrocorundum, technical alumina, and pyrophillite are presented. The mixing liquid is H3PO4 and an alumochromophosphate binder. The creep tests have been performed using an installation created by BashNIPIstrom State Enterprise, which makes it possible to test three specimens in one cycle simultaneously. The experimental data on the deformation of the concretes as a function of the pressing pressure, the treatment temperature, and the test conditions (the time, the temperature, and the load) are presented. The present work is the first attempt to study the endurance of materials on phosphate binders under the joint action of high pressures and loads. 相似文献