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Online since: March 2007
Authors: Goffredo de Portu, Lorenzo Micele
Because of the high number of components involved in the process, tape-casting slurries are complex and a very precise procedure is recommended.
Different batches of hybrid laminates were prepared changing the numbers of layers and/or A/AZ thickness ratio.
Darker grains are alumina grains.
Alumina grains are the darker ones.
The grains of Al2O3 in the composite are smaller than in the A layer as a consequence grain growth hindering exerted by ZrO2.
Online since: September 2014
Authors: Brigitte Bacroix, T. Otsuka, Renald Brenner
There are certain numbers of slip systems depending on the crystal lattice, where slip occurs easily in comparison with other combinations of directions and surfaces.
After the germination, the new grains start to grow isotropically with time.
Simulation of Transformation Plasticity Simulations have been done with 100 new grain seeds out of 100 parent phase grains of polycrystalline materials within 643 voxels cubic space.
The initial orientation of each grain has been set randomly, whereas the daughter phase grains take orientations according to Kurdjumov-Sachs relation [6].
(a) Initial austenite phase (b) During phase transformation Fig. 1 Sample Voronoi tessellation and phase transformation; 100 grains in 643 cubic space.
Online since: June 2017
Authors: Qi Xing Yang, Peng Xue, Fredrik Engström, Bo Björkman, Feng Lan Han, Liang Jiang, Gui Qun Liu
It was observed in Fig. 3 that f-MgO grains were with the sizes of 5-10μm and C2F was evenly distributed in the quenched steel slag.
Moreover, it was found that the growth of C2S grains was largely inhibited by air quenching.
In Slag B, sizes for some C2S grains were smaller than 2μm and there were also some nano-sized C2S grains.
The hydraulic activity of C2S in the air quenched slag samples can be largely enhanced with the reductions of its grain sizes.
The sizes for C2S grains in the steel slag were 10-20μm and were decreased to nano-scales by the quenching treatment for Slag B.
Online since: June 2011
Authors: Jilt Sietsma, Lie Zhao, John G. Speer, M. J. Santofimia
In a real martensite/austenite system, the sizes of the austenite and martensite regions would not be constant across the microstructure, but variable and limited by the prior austenite grain size, the mutual accommodation of the martensite grains formed in the first quench and any compositional inhomogeneity in the steel.
The motion of interfaces in a microstructure is a result of the repositioning of atoms from lattice positions in one grain to projected lattice positions in a neighboring grain.
The final carbon profiles are obtained after annealing for about 2000 s in the case of grains with 0.2 μm thicknesses and for about 5000 s in the case of phases having 0.6 μm thicknesses.
Conclusions For the same conditions of temperature, composition and interface mobility, the kinetics of carbon partitioning from martensite to austenite are slower for larger grains.
Acknowledgements This research was carried out under the project number MC41.5.09346 in the framework of the Research Program of the Materials innovation institute M2i (www.m2i.nl).
Online since: July 2005
Authors: Alan A. Luo, Anil K. Sachdev
Optical microscopy was used to examine the grain structure of both magnesium alloys, AM30 and AZ31, before and after bending.
Fig. 5 exhibits the longitudinal grain structures of AZ31 and AM30 alloy tubes before and after bending.
Fig. 5 also shows that bending deformation at 149ºC was largely achieved by twinning, and large grains are elongated along the bend direction.
However, twinning is absent in the microstructure of AZ31 alloy tube after 204ºC bending, where deformation was accompanied by localized dynamic recrystallization (DRX), i.e., formation of new strain-free grains (2-3 µm in diameter) along the original high-angle grain boundaries.
DRX has been reported in magnesium alloys by a number of researchers [6-8], and its role in deformation and formability was discussed by the authors in another publication [4].
Online since: August 2021
Authors: Sergey V. Brusnitsyn, Irina A. Gruzdeva, Vadim V. Morgunov
It should be noted that foreign standards have higher requirements for the number of kinks and twists that the contact wire must withstand.
Moreover, zirconium greatly refines the grain structure of copper and prevents excessive grain growth.
With an increase in temperature from T=20 °C to T=900 °C, the average grain size in tough pitch copper increases from 40 ... 50 μm to 200 ... 500 μm, and in the Cu-0.06% Zr alloy, the grain size changes from 8 ... 10 μm to 60 ... 80 μm.
This makes it possible to restrain the migration of grain boundaries during heating and the movement of dislocations [9-10, 13].
The nature of the change in the crystal grain with increasing temperature will depend on the content of impurities in the alloy and the degree of distortion of the crystal lattice caused by cold deformation.
Online since: August 2018
Authors: Alexander B. Vladimirov, Anna P. Rubshtein, Sergey A. Plotnikov
The interfaces and possible grain boundaries deflect or reduce the cracks propagation and stress concentration [15].
It was established that the phase composition of (TiCx/Ti/C) depends on carbon content, while the density and hardness – on the volume fraction of TiCx grains [2].
The number of passes amounted to 10.
At CC > 20 wt. %, carbon atoms, which are not Ti-bonded, form amorphous matrix containing TiCx grains - (TiCx/C) [2-4].
The volume fraction of the interface component depends on the grain size and has two maximums at CC = 10 and 58 wt. % [2, 4].
Online since: January 2013
Authors: Jie Qu, Guang Yong Chen
Digital identities exist in a variety of formats such as employee number, user name, and digital certificates according to business needs and management needs.
It will greatly reduce not only the number passwords users need to remember but also the number of times usersneed to login on
In the early phase of implementation of digital identity management platform,it is necessary to integrate existing employee number, employee name, employee department, employee account number and certificate number into the platform based on Web-based services and LDAP protocol.Centralized interface based on Web services interact with HR systems for employee number, employee name, employee department information.
The employee number is the unique identity for the employee associated with other identities such as employee number, employee name, department name, account number, certificate number etc.
The resource permissions could be implementedeither in a coarse-grained way or in a fine-grained way which closely related to the resource information.
Online since: September 2014
Authors: Ye Hua Jiang, Rong Feng Zhou, Zong Bao Chen, Lu Li, Rong Zhou
The refining mechanism of PSPs was also analyzed according to the change of the spreading state, the number of PSPs in per unit area (N), and the distribution of PSPs size under a series of different rotating speeds.
In this process, when the metal melt flew through cooling plate, the nucleation and growth of grains relied on the chilling effect of the cooling plate, as well as cutting and ripening of the melt itself or interaction between the melt and cooling.
So grain refining becomes worse, the homogeneous of microstructures is broken.
In Fig. 5, the relationship between rotating speed and number of PSPs in per unit area for Al-25Si alloy is shown.
At the rotating speeds of 500 ~ 600 r/min, the number of PSPs in per unit area could get the maximum through RRIN process, which were 2 ~ 4 times than that obtained at common casting condition. 4 The refining mechanism of RRIN At pouring temperature was 785 ℃, the viscosity force of the melt was constant.
Online since: September 2006
Authors: J.C. Outeiro, Rachid M'Saoubi, Domenico Umbrello
Moreover, an increase in the thickness of the tensile layer is also observed with the number of cuts, this difference also being greater between the first and the second cut.
Microstructure of the steel consisted of an equiaxed grain structure characterized by an approximate grain size of 50 µm and material hardness was close to 170HV.
The statistical error for the calculated stresses was less than 50 MPa, but in some cases, where the depth exceeded 250 µm, it reached 100 MPa, due to the large grain size of the work material.
As seen in this figure, the superficial circumferential residual stresses increased with the number of cuts.
Moreover, an increase in the thickness of the tensile layer was also observed with the number of cuts, this difference also being greater between the first and the second cuts.
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