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Online since: January 2004
Authors: A. Kirfel, Wolfgang Schäfer, E. Jansen, J. Palacios
Metal textures can be described in very
good approximation by superposition of a
small number of texture components starting
from ideal crystallite orientations (see
e.g. [4]).
These points smear out and spread into characteristic spots upon glide deformation and/or mechanical twinning caused by metal rolling, and upon grain boundary effects and/or grain rotations during recrystallization.
The results of living textures witness the fact that once produced textures are influenced by a complex superposition of the various physical processes with different kinematics like grain size migration, subgrain rotation, dislocation glide and mechanical twinning.
These points smear out and spread into characteristic spots upon glide deformation and/or mechanical twinning caused by metal rolling, and upon grain boundary effects and/or grain rotations during recrystallization.
The results of living textures witness the fact that once produced textures are influenced by a complex superposition of the various physical processes with different kinematics like grain size migration, subgrain rotation, dislocation glide and mechanical twinning.
Online since: March 2017
Authors: Mintu Tyagi, Vinod Kumar, Gurpreet Kaur, Puneet Sharma
A number of Multiferroic composites have been explored to achieve the high values of ME coupling coefficient.
The BNT-BKT-BMgT sample shows larger grains as compared to composite sample.
The addition of CZFMO promotes reduction in the grain size with little porosity as reported earlier.
The reduction in grain size could be the result of pinning action by CZFMO in the composite.
The BNT-BKT-BMgT sample shows larger grains as compared to composite sample.
The addition of CZFMO promotes reduction in the grain size with little porosity as reported earlier.
The reduction in grain size could be the result of pinning action by CZFMO in the composite.
Online since: December 2006
Authors: Shinji Ando, Hideki Tonda, Masayuki Tsushida, Takahiro Sakamoto, Yukishige Ikejiri
Coarse grained ingots with a grain size of
about 20 mm were obtained by this method.
Single crystal specimens were made from the coarse grains by machining.
Number of cycles to failure, Nf / cycle Stress amplitude, σa / MPa 450 400 350 300 250 200 150 104 105 106 107 108 A-specimen B-specimen F-specimen G Fig. 4 S-N plots of A, B and F-specimens. 1µm [1120] [0001] Crack growth direction G Fig. 6 Fatigue surface of B-specimen
Single crystal specimens were made from the coarse grains by machining.
Number of cycles to failure, Nf / cycle Stress amplitude, σa / MPa 450 400 350 300 250 200 150 104 105 106 107 108 A-specimen B-specimen F-specimen G Fig. 4 S-N plots of A, B and F-specimens. 1µm [1120] [0001] Crack growth direction G Fig. 6 Fatigue surface of B-specimen
Online since: November 2011
Authors: Jian Sheng Xie, Jin Hua Li, Luan Ping
In this work, the average grain size is about 13.4 nm .
The main parameters(annealing temperature (T), annealing time (t), constant of crystal lattice(d), grain size and peak position 2θ) of CuInSi nanocomposite films are shown in Table 1.
XRD patterns of CuInSi nanocomposite films Table 1 Main XRD parameters of CuInSi nanocomposite films Sample T (℃) t (Min) d (angstrom) grain size (nm) 2θ (°) b 480 22 2.1273 18.8 42.458 c 500 15 2.1406 10.6 42.181 d 500 22 2.1358 12.8 42.280 e 500 25 2.1272 11.3 42.68 Optical absorption studies.
The energy gap (Eg) of CuInSi nanocomposite film was calculated based on the following equation[8] (2) where A is a proportionality constant, h is the Planck constant and n is a number which characterizes the transition process, n=1/2, 2, 3/2 or 3 for allowed direct, allowed indirect, forbidden direct or forbidden indirect transitions, respectively.
The main parameters(annealing temperature (T), annealing time (t), constant of crystal lattice(d), grain size and peak position 2θ) of CuInSi nanocomposite films are shown in Table 1.
XRD patterns of CuInSi nanocomposite films Table 1 Main XRD parameters of CuInSi nanocomposite films Sample T (℃) t (Min) d (angstrom) grain size (nm) 2θ (°) b 480 22 2.1273 18.8 42.458 c 500 15 2.1406 10.6 42.181 d 500 22 2.1358 12.8 42.280 e 500 25 2.1272 11.3 42.68 Optical absorption studies.
The energy gap (Eg) of CuInSi nanocomposite film was calculated based on the following equation[8] (2) where A is a proportionality constant, h is the Planck constant and n is a number which characterizes the transition process, n=1/2, 2, 3/2 or 3 for allowed direct, allowed indirect, forbidden direct or forbidden indirect transitions, respectively.
Online since: May 2011
Authors: Bin Jia, Dai Guo Chen, Yong Yao, Xiao Qiang Chen
Currently, most of the existing research results at home and abroad are in allusion to coarse grained soil of earth and rockfill dam, while research results on sandy pebble soil of construction foundation is few.
Due to the difference in gradation of coarse grained soil, great discrepancy exists in the strength of the two, Wang Ruheng and other researchers analyzed the effect law of parameters such as ‘vibration frequency’, ‘confining pressure’ and ‘water content’ on static and dynamic strength and constitutive relation of sandy pebble soil, and proposed constitutive equations and static dynamic engineering characteristics of sandy pebble soil [4].
Fig. 4 curve (under different ) Fig. 5 curve (under different ) Conclusions Through the laboratory dynamic triaxial test, in terms of analyzing characteristics of dynamic loading of sandy pebble soil, thorough experimental research on dynamic stress engineering characteristics of sandy pebble soil is performed, a number of important conclusions are reached: (1) Dynamic stress of sandy pebble soil improves a little with accretion of confining stress ratio K, while significantly increases with the growth of vibration frequency .
) [3] Jia Geji: Experimental Study on Engineering Properties of Coarse-Grained Soils.
Due to the difference in gradation of coarse grained soil, great discrepancy exists in the strength of the two, Wang Ruheng and other researchers analyzed the effect law of parameters such as ‘vibration frequency’, ‘confining pressure’ and ‘water content’ on static and dynamic strength and constitutive relation of sandy pebble soil, and proposed constitutive equations and static dynamic engineering characteristics of sandy pebble soil [4].
Fig. 4 curve (under different ) Fig. 5 curve (under different ) Conclusions Through the laboratory dynamic triaxial test, in terms of analyzing characteristics of dynamic loading of sandy pebble soil, thorough experimental research on dynamic stress engineering characteristics of sandy pebble soil is performed, a number of important conclusions are reached: (1) Dynamic stress of sandy pebble soil improves a little with accretion of confining stress ratio K, while significantly increases with the growth of vibration frequency .
) [3] Jia Geji: Experimental Study on Engineering Properties of Coarse-Grained Soils.
Online since: June 2005
Authors: S.Y. Chun, Sang Jin Lee
The sintered β-TCP was fully densified
5µµµµm
(b(b(b(b))))
((((aaaa))))
5µµµµm Journal Title and Volume Number (to be inserted by the publisher) 3
showing grain size of 2.0~5.0 µm.
The sintered wollastonite was fully densified showing needle-like grains.
And the grain size was controlled to smaller and more uniform in comparison with the normal sintered microstructure.
The sintered wollastonite was fully densified showing needle-like grains.
And the grain size was controlled to smaller and more uniform in comparison with the normal sintered microstructure.
Online since: September 2011
Authors: Pablo Pasquale, Selvam Rajiv, Karibeeran Shanmuga Sundaram
Table 1: Specification of Coil and Work Piece
Coil
Number of turns
4
Max.coil withstand Pressure
110 MPa
Working height
135 mm
Capacitor banks
Charging energy
20 kJ
Circuit inductance
450 nH
Circuit capacitance
400 µF
Charging voltage
10kV
Frequency & Amplitude
6.5 kHz & 150 kA
No. of capacitors
4
Tube
Material & Outer diameter
AA 6063 & 40 mm
Thickness
2 mm
Tensile strength
214 MPa
Poison’s ratio
0.33
The energy levels lesser than 6 kJ were not considered, as it had no appreciable formability.
The grains of parent material are observed to be coarse.
Some grains have got elongated along the same direction.
The observations of the matrix at the two edges show the presence of grain boundary cracking and re-crystallization at the core.
The grains of parent material are observed to be coarse.
Some grains have got elongated along the same direction.
The observations of the matrix at the two edges show the presence of grain boundary cracking and re-crystallization at the core.
Online since: March 2022
Authors: Muhammad Riza, Soewito Soewito, Hendri Dunan, Bambang Pratowo, Ahmad Cucus, Rifki Muhida, Agus Geter Edy Sutjipto, Riza Muhida
., the maximum height and the lateral length of the half-spherical region to be assemblages of some grains increase as d increases.
Another report confirms this that poly-Si that deposited in highly textured substrate occurs collisions between the columnar crystal with neighbor grains, and then creates a grain boundary and related defects [6, 8, 9, 12, 13, 15] Fig. 3: Local Average Current (a) Crystallite (b) and RMS Roughness of surface (c), as a function of RMS Roughness Based-substrate.
[10] Takuya Matsui, Masaharu Tsukiji, Hiroyuki Saika, Toshihiko Toyama, Hiroaki Okamoto, Correlation between Microstructure and Photovoltaic Performance of Polycrystalline Silicon Thin Film Solar Cells, Japanese Journal of Applied Physics, Volume 41, Number 1R, (2002), Page 20
Another report confirms this that poly-Si that deposited in highly textured substrate occurs collisions between the columnar crystal with neighbor grains, and then creates a grain boundary and related defects [6, 8, 9, 12, 13, 15] Fig. 3: Local Average Current (a) Crystallite (b) and RMS Roughness of surface (c), as a function of RMS Roughness Based-substrate.
[10] Takuya Matsui, Masaharu Tsukiji, Hiroyuki Saika, Toshihiko Toyama, Hiroaki Okamoto, Correlation between Microstructure and Photovoltaic Performance of Polycrystalline Silicon Thin Film Solar Cells, Japanese Journal of Applied Physics, Volume 41, Number 1R, (2002), Page 20
Online since: August 2024
Authors: Mohamed Azzaz, Warda Laslouni, Ahmed Haddad, Hanane Mechri, Zineb Hamlati
One can obtain these materials directly by preventing grain growth above a certain value, or by reducing the grain size of a solid alloy to the nanoscale using various techniques.
The grains were about 10 nm in size.
Valiev, Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena, Mater.
Zhang, Oxygen-mediated deformation and grain refinement in Cu–Fe nanocrystalline alloys, Acta Mater. 166 (2019) 281–29
Enzo, Kinetics behaviour of metastable equiatomic Cu–Fe solid solution as function of the number of collisions induced by mechanical alloying, J.
The grains were about 10 nm in size.
Valiev, Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena, Mater.
Zhang, Oxygen-mediated deformation and grain refinement in Cu–Fe nanocrystalline alloys, Acta Mater. 166 (2019) 281–29
Enzo, Kinetics behaviour of metastable equiatomic Cu–Fe solid solution as function of the number of collisions induced by mechanical alloying, J.
Online since: August 2013
Authors: Shao Ping Fu, Meng Ting Geng, Xiao Hui Wu, Xin Wen Hu, Yi Min, Jian Chun Guo, Yuan Yao
The scanning electron microscope observations SC124 in vitro cassava storage roots starch and field cultivation of cassava root starch, starch grains formed by these two different ways is very similar in size and shape.
Jianhua Xin [10] Reported that exogenous calcium levels can affect the quantity and weight of the potato tuber, improve the level of exogenous calcium, significantly reduced the number of single plant tuber, but to promote the tuber enlargement, increase tuber commodity rate, while the single strains yield there was a certain reduction.
The scanning electron microscope observations SC124 in vitro cassava storage roots starch and field cultivation of cassava root starch, starch grains formed by these two different ways is very similar in size and shape (Fig.5).Tissue culture as a model to study the cassava plantlets storage roots starch synthesis mechanism is feasible.
Jianhua Xin [10] Reported that exogenous calcium levels can affect the quantity and weight of the potato tuber, improve the level of exogenous calcium, significantly reduced the number of single plant tuber, but to promote the tuber enlargement, increase tuber commodity rate, while the single strains yield there was a certain reduction.
The scanning electron microscope observations SC124 in vitro cassava storage roots starch and field cultivation of cassava root starch, starch grains formed by these two different ways is very similar in size and shape (Fig.5).Tissue culture as a model to study the cassava plantlets storage roots starch synthesis mechanism is feasible.