Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

Online since: October 2008
Authors: Mieczyslaw Jurczyk, Maciej Tulinski, Karolina Jurczyk
Matrix Grain boundary Element Wt% At% Wt% At% Fe 74.54 73.64 70.66 67.68 Cr 18.90 20.06 21.46 22.08 Mn 0.00 0.00 0.36 0.35 Mo 5.70 3.28 5.47 3.05 O 0.72 2.47 2.05 6.85 N 0.14 0.56 0.00 0.00 Table 1.
EDX analysis in the matrix and at the grain boundary of Fe74Cr24Mo2N sample The results of EDX analysis of the Fe74Cr24Mo2N alloy shown in Table 1 confirms that the material's matrix there has a composition 74% Fe, 20% Cr and 3% Mo.
At the grain boundaries a small content of manganese and a increase in the oxygen content to 7% at can be observed.
There was a large difference in number of cells in the studied samples.
Online since: December 2019
Authors: V.B. Babaev, Natalia I. Alfimova, Viktoriya Viktorovna Nelubova, L.N. Botsman
At the moment the most significant trends in construction development area include the use of light prefabricated structures; development of 3D printing technologies [1–5]; the consumption growth of energy-saving structures that contributes to increase the number of productions of highly efficient thermal insulating materials [6–9 and others]; increased percentage of materials produced using production wastes and secondary raw materials [10–12]; the development of highly efficient materials with desired properties for operation in extreme conditions [13–15], as well as the production of certain types of materials, such as various fiber types reinforced concrete - fiber-reinforced concrete [16–25].
Durachenko, Fine-grained fiber reinforced with polypropylene fiber, Bulletin of BSTU named after V.G.
Balykov, Experimental-statistical models of properties of modified fiber-reinforced fine-grained concretes, Magazine of Civil Engineering. 2 (2016) 13–25
Durachenko, Fine-grained fiber reinforced with polypropylene fiber, Bulletin of BSTU named after V.G.
Online since: June 2013
Authors: Rudolf Kawalla, Gunter Lehmann, Stanislav Dedov
By a direct combination of casting and forging processes (casting and forging from the same heat) the number of process steps and energy consumption can be reduced.
The light gray particles (a) on the right side of fig. 7 are the silicon surplus on the grain boundaries.
Fig. 12: Microstructure of AlSi1MgCu0,5 in coupled casting-forging process: as-cast state (left) and after 65 % deformation (right), magnification x 200 The amount of dark particles of Mg2Si located on the grain boundaries in the cast state (Fig. 13 left) is increased with higher silicon content, which has a direct effect on the mechanical properties of the cast material.
In addition to coarse grained microstructure, this is one the reasons for the higher brittleness alloys in as-cast state.
Online since: February 2018
Authors: B.S. Pankaja, K V S B RAJU
A number of studies are available in literature on estimating the horizontal pullout resistance and uplift capacity of anchors, Das and Seeley (1975), Rowe (1978), Ovesen (1981), Dickin (1988), Murray and Geddes (1987,1989), Sarac (1989), Niroumand (2010), Niroumand and Kassim(2010), Bildik and Laman (2010), Kumar and Bhoi (2009).
Fig. 1 Schematic sketch of test setup Fig. 2 Various combinations of anchor Fig. 3 Photograph showing mild steel tank, raining box and lever hatchet Fig. 4 Thin curved plastic shear zone emerging from the bottom of the anchor and then terminating at the ground surface above the level of anchors Material Properties The chosen sand was kept dry and using the sieve analysis, following grain size parameters were obtained: (i) D10 = 0.24 mm, (ii) D30 = 0.42 mm, (iii) D60 = 0.7 mm, (iv) uniformity coefficient, Cu = 3.04, and (v) coefficient of curvature, Cc = 1.096 where D10, D30 and D60 are the sizes corresponding to which 10, 30 and 60% material by mass are respectively smaller than that size.
The grain size distribution curve of sand used in the present study is shown in Fig.5.
Fig. 5 Grain size distribution of sand Results and Discussions The variation of the horizontal pullout load (pu) Vs corresponding horizontal displacement ( for group of anchors of sizes 100mm square and 150mm square for different embedment ratio H/B=5 and H/B=6 at different S/B ratio of 0,1 and 2 are shown in Fig.6 to Fig.9 for tests carried out at a relative density of 55% corresponding to medium dense sand.
Online since: February 2021
Authors: Yongyuth Dunyakul, Chaiyoot Meengam, Dech Maunkhaw
The microstructure of the alpha phase (α) was a globular shape and the beta phase (β) had a shape of cross-links formed Al2Cu phase, which was inserted between the grain boundaries.
At 800X magnification, it showed the distribution of Al2Cu phase from cross-link structure, which was inserted at the grain boundary of the globular structure.
Also, the experiment of the above variables showed that the low number of voids, which supports good mechanical properties [10].
However, the BM region received very little heat resulting in the atoms not moving between grains; therefore, the structure was not changed much which would not be able to change the hardness.
Online since: May 2014
Authors: Wilfrid Seiler, Chedly Braham, Alain Lodini, Jean Paul Chopart, Marianna Marciszko, Krzysztof Wierzbanowski, Andrzej Baczmański, Nacer Zazi
The y{hkl} angle depends on hkl reflection (2q{hkl} angle) and on a constant incidence angle a (Fig. 1): (1) Consequently, possible values of y{hkl} angles are limited to the number of hkl reflections used in the experiment.
In this work the Williamson-Hall method [8] was applied to determine the root mean square value of the third order strain characterizing the distortion of the lattice within grains.
The root mean square values of the third order strain characterizing the distortion of the lattice within the grains, calculated using the Williamson-Hall method [8], are shown in Table 4.
Additionally, the root mean square values of the third order lattice strain within diffracting grains were determined.
Online since: April 2019
Authors: Smail Gabi, Faroudia Meziani, Kahil Amar
The evaluation of a number of problems affecting dikes, for example large settlements, often require consideration of the dynamic behavior of granular soils, ie seismic excitation [1, 2].
In the absence of water, rearrangement of the granular skeleton stems only from interactions between the grains (drained conditions) [5-7].
In the presence of water, if the rearrangement rate of the skeleton is slow enough, water can flow between the grains at a very slow pace, thus, the interstitial pressure can be considered as not evolving throughout the entire duration of loading [8].
However, areas C and D presented their part a narrow dispersion; it can be explained by the fact that the central area under the dike (area C and D) is the most loaded in terms of dead load resulting in an rearrangement of the grains in the soil mass.
Online since: June 2012
Authors: Shu Hui Yu, Wen Hu Yang, Ru Xu Du, Rong Sun
The free electrons could be captured by the CCTO filler because of the defects and vacancies on the grain surface, which also can be reflected by the reduction of the RB.
Thus, the number of such points can be reasonably increased with the fNi.
A single micro-sized CCTO filler is composed of a semi-conducting grain surrounded by a thin insulating or semi-conducting grain boundary.
Online since: November 2023
Authors: John G. Speer, Diptak Bhattacharya, Jake A. Colburn, Jonah Klemm-Toole
Deeper cracks, and greater numbers of cracks, were also present after testing Zn-coated DH1000.
These three steels were fully austenitized during processing, with prior-austenite grain boundaries (PAGS) remaining as a characteristic of the substrate microstructure following displacive transformation.
Dissolved iron in the liquid coating should also reduce the Zn activity and influence Zn penetration of grain boundaries, consistent with the reduced LME encountered in galvannealed AHSS (having a Fe-Zn alloyed coating) in comparison to hot-dip galvanized AHSS [14-16] having a relatively unalloyed Zn coating.
Dupuy, Embrittlement of steels by liquid zinc: crack propagation after grain boundary wetting, Advanced Materials Research, 922 (2014) 161-166
Online since: May 2012
Authors: Chao Fu Zhu, Yu Jie Ren
Micro-Raman spectroscopy with blue laser (WITec Alpha300, excitation wavelength 488 nm) was used to evaluate the quality and the number of layers of the graphene.
Muller, Grains and grain boundaries in single-layer graphene atomic patchwork quilts, Nature, 469(2011), No.7330, p.389-392
Showing 18951 to 18960 of 28673 items