scholarly journals ELASTIC FIELDS OF VACANCY VOIDS AND THEIR INTERACTION WITH RADIATION DEFECTS IN BCC METALS Fe AND V — CALCULATION METHODS

2021 ◽  
Vol 44 (1) ◽  
pp. 119-135
Author(s):  
A.B. Sivak ◽  
◽  
P.A. Sivak ◽  
Keyword(s):  
Radiation Defects ◽  
Calculation Methods ◽  
Elastic Fields ◽  
Bcc Metals

High-temperature stages of the annealing of radiation defects in refractory BCC metals

1975 ◽  
Vol 38 (2) ◽  
pp. 101-104 ◽  
Author(s):  
M. I. Zakharova ◽  
V. A. Solov'ev ◽  
V. N. Bykov
Keyword(s):  
High Temperature ◽  
Radiation Defects ◽  
Bcc Metals

Vacancy Diffusion under a Stress and Kinetic of Nanovoid Growth in Cubic Metals

2014 ◽  
Vol 95 ◽  
pp. 72-77
Author(s):  
Andrei Nazarov ◽  
Alexander Mikheev ◽  
Alexander Zaluzhnyi
Keyword(s):  
Elastic Stress ◽  
Diffusion Processes ◽  
Activation Barrier ◽  
Transformation Kinetic ◽  
Elastic Fields ◽  
Cubic Metals ◽  
Bcc Metals ◽  
Nanovoid Growth ◽  
Atom Configuration ◽  
Atom Position

Elastic fields, generating by defects of the structure, influence the diffusion processes. It leads to the alteration of the phase transformation kinetic. One of the chief aims of our work is to obtain general equations for the diffusion fluxes under strain that give the possibility for using these equations at low temperatures, as in this case the strain influence on the diffusion fluxes is manifested in maximal degree. Our approach takes into consideration, that the strains can alter the surrounding atom configuration near the jumping one and consequently the local magnitude of the activation barrier and a rate of atom jump. The rates of atom jumps in different directions define the flux density of the vacancies. Now we take into account, that strain values are different in the saddle point and in the rest atom position, in differ from our consideration that was done by us earlier. As a result in the development of our approach the general equations for the vacancy fluxes are obtained for fcc and bcc metals. In our paper we discuss the main features of the theory of diffusion under stress and its applications. In particular we examine how elastic stress, arising from nanovoids, influence the diffusion vacancy fluxes and the growth rate of voids in metals.

Field-Ion Microscopy of BCC Metals: A Study of Image Differences and Topographical Variations

1973 ◽  
Vol 31 ◽  
pp. 114-115
Author(s):  
O. T. Inal ◽  
L. E. Murr
Keyword(s):  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Surface Atom ◽  
Image Brightness ◽  
Field Ion Microscopy ◽  
Topographic Features ◽  
Bcc Metals ◽  
Electron Orbital ◽  
Ion Microscopy ◽  
Field Ion Microscope

When sharp metal filaments of W, Fe, Nb or Ta are observed in the field-ion microscope (FIM), their appearance is differentiated primarily by variations in regional brightness. This regional brightness, particularly prominent at liquid nitrogen temperature has been attributed in the main to chemical specificity which manifests itself in a paricular array of surface-atom electron-orbital configurations.Recently, anomalous image brightness and streaks in both fcc and bee materials observed in the FIM have been shown to be the result of surface asperities and related topographic features which arise by the unsystematic etching of the emission-tip end forms.

Solid Solution Effects and Deformation Micros trueture of Shock-Loaded Iron Manganese Alloys

1970 ◽  
Vol 28 ◽  
pp. 420-421
Author(s):  
A. Christou ◽  
J. V. Foltz ◽  
N. Brown
Keyword(s):  
Solid Solution ◽  
Shock Loading ◽  
High Strain ◽  
Local Stress ◽  
Strain Rates ◽  
Local Stress Concentration ◽  
Bcc Metals ◽  
Manganese Alloys ◽  
Iron Manganese ◽  
Transmission Microscope

In general, all BCC transition metals have been observed to twin under appropriate conditions. At the present time various experimental reports of solid solution effects on BCC metals have been made. Indications are that solid solution effects are important in the formation of twins. The formation of twins in metals and alloys may be explained in terms of dislocation mechanisms. It has been suggested that twins are nucleated by the achievement of local stress-concentration of the order of 15 to 45 times the applied stress. Prietner and Leslie have found that twins in BCC metals are nucleated at intersections of (110) and (112) or (112) and (112) type of planes.In this paper, observations are reported of a transmission microscope study of the iron manganese series under conditions in which twins both were and were not formed. High strain rates produced by shock loading provided the appropriate deformation conditions. The workhardening mechanisms of one alloy (Fe - 7.37 wt% Mn) were studied in detail.

Challenges of the Crisis: How to Measure Sustainable Development?

2015 ◽  
pp. 147-160 ◽  
Author(s):  
S. Bobylev ◽  
N. Zubarevich ◽  
S. Solovyeva
Keyword(s):  
Sustainable Development ◽  
World Bank ◽  
Environmental Indicators ◽  
Calculation Methods ◽  
Basic Principles ◽  
The Sustainable Development ◽  
Development Index ◽  
Development Indicators ◽  
Sustainable Development Indicators ◽  
Adjusted Net Savings

The article emphasizes the fact that traditional socio-economic indicators do not reflect the challenges of sustainable development adequately, and this is particularly true for the widely-used GDP indicator. In this connection the elaboration of sustainable development indicators is needed, taking into account economic, social and environmental factors. For Russia, adaptation and use of concepts and basic principles of calculation methods for adjusted net savings index (World Bank) and human development index (UNDP) as integral indicators can be promising. The authors have developed the sustainable development index for Russia, which aggregates and allows taking into account balanced economic, social and environmental indicators.

Macroscopic conductivity of random inhomogeneous media. Calculation methods

1996 ◽  
Vol 166 (10) ◽  
pp. 1069 ◽  
Author(s):  
A.G. Fokin
Keyword(s):  
Inhomogeneous Media ◽  
Calculation Methods

COMPARATIVE ANALYSIS OF EQUILIBRIUM BEACH PROFILE CALCULATION METHODS

2015 ◽  
pp. 39
Author(s):  
A. L. Khomchanovsky ◽  
E. A. Fedorova ◽  
An. A. Lygin ◽  
A. Sh. Khabidov
Keyword(s):  
Comparative Analysis ◽  
Calculation Methods ◽  
Beach Profile ◽  
Equilibrium Beach Profile
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