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Online since: December 2010
Authors: Jiao Lian Luo, Teiko Okazaki, Koji Yamada, Hiroyasu Shimoji, Yasusi Nakahata, Edmund Bartosz Borkowski, Takashi Todaka, Masato Enokizono
This physical mechanism also reflects the coherent length change of itinerant electrons, caused by the scattering by the comparable short-range spin disorder of Mn-Mn pairs in the nano-scale crystal grain.
The fabricated samples were specially designed as nano-scaled grains of Ni3-dMn1+d for different d (0≤d<≤.05).
The wavefunction sizes of the carriers are limited within the crystal grain size caused by the heavy coulombic scattering.
It is important to note that the wave-number of the itinerant electron near the Fermi surface do not play an important role on the magneto-conductivity, but the electronic coherent length as a function of the magnetization determines the conductivity.
Doubtlessly, the coherent length is largely limited by crystal grain boundaries with Coulombic disorder potential and independent on the magnetization.
The fabricated samples were specially designed as nano-scaled grains of Ni3-dMn1+d for different d (0≤d<≤.05).
The wavefunction sizes of the carriers are limited within the crystal grain size caused by the heavy coulombic scattering.
It is important to note that the wave-number of the itinerant electron near the Fermi surface do not play an important role on the magneto-conductivity, but the electronic coherent length as a function of the magnetization determines the conductivity.
Doubtlessly, the coherent length is largely limited by crystal grain boundaries with Coulombic disorder potential and independent on the magnetization.
Online since: December 2024
Authors: Asish Dahiya, Suman Chakraborty, Munna Pati
Lower pouring temperatures in RDC increase primary α-Al grains and average grain size, while higher temperatures lead to larger grain sizes.
Experimental Procedure The research method for examining the microstructure of aluminum alloy A356 under air- cooling conditions consists of a number of steps.
This may have contributed to the reduction in grain size.
The samples that were rolled and then recrystallized showed that α grains were in elongated shape in the rolling direction and α grains were in equiaxed form in the transverse direction (with an average grain size of around 25 μm).
The microscopic image was analyzed in the Microcam software to identify the number of grains visible and the area covered by each grain.
Experimental Procedure The research method for examining the microstructure of aluminum alloy A356 under air- cooling conditions consists of a number of steps.
This may have contributed to the reduction in grain size.
The samples that were rolled and then recrystallized showed that α grains were in elongated shape in the rolling direction and α grains were in equiaxed form in the transverse direction (with an average grain size of around 25 μm).
The microscopic image was analyzed in the Microcam software to identify the number of grains visible and the area covered by each grain.
Online since: November 2013
Authors: Ya Lin Lu, Jiang Tao Wang, Lin Dou, Xing Cheng Li
However, the symmetry of the hexagonal close-packed crystal structure has the limited number of independent slip systems, resulting in poor formability and ductility near room temperature.
It is clear that grains size vary with deformation process parameters.
Above 623K of deformation temperature, grain size increases gradually.
Above 623K of deformation temperature, grain size increases gradually.
Above the critical value, grains coarsen gradually.
It is clear that grains size vary with deformation process parameters.
Above 623K of deformation temperature, grain size increases gradually.
Above 623K of deformation temperature, grain size increases gradually.
Above the critical value, grains coarsen gradually.
Online since: October 2010
Authors: Krishna Uibel, Jens Eichler, Christoph Lesniak
Hexagonal boron nitride (h-BN) is a very versatile material that is used in a number of applications due to its unique combination of properties.
The BN grains are well defined and limited contact points are visible between the grains.
It functions as an inorganic glue between the h-BN grains.
During high-temperature pressure- assisted densification it becomes liquid and supports grain reorientation and grain growth.
During the sintering process the Ca-borate phase enhances grain growth of the h-BN particles.
The BN grains are well defined and limited contact points are visible between the grains.
It functions as an inorganic glue between the h-BN grains.
During high-temperature pressure- assisted densification it becomes liquid and supports grain reorientation and grain growth.
During the sintering process the Ca-borate phase enhances grain growth of the h-BN particles.
Online since: June 2014
Authors: Zhou Fa Zhou, Si Jia Yao, Feng Ye, Zhe Tian, Shu Mei Wang
Sample number and mass ratio are showed in Table 1.
Table 1 Sample number and mass ratio Sample number Sodium bicarbonate: Citric acid (w/w) K0 1: 0 K1 1: 0.1 K2 1: 0.5 K3 1: 1 K4 1: 1.5 Characterization Morphology of modified sodium bicarbonate was characterized by scanning electron microscope(SEM, XL 300 by Royal Dutch Philips Electronics Ltd., Holland).
In the Fig.1, the little schistose solid on the surface of bigger grains was citric acid crystal.
The citric acid crystal can recrystallize and adhere to the surface of grains.
In the Fig.1 a, there are few citric acid crystals on the surface of sodium bicarbonate grains.
Table 1 Sample number and mass ratio Sample number Sodium bicarbonate: Citric acid (w/w) K0 1: 0 K1 1: 0.1 K2 1: 0.5 K3 1: 1 K4 1: 1.5 Characterization Morphology of modified sodium bicarbonate was characterized by scanning electron microscope(SEM, XL 300 by Royal Dutch Philips Electronics Ltd., Holland).
In the Fig.1, the little schistose solid on the surface of bigger grains was citric acid crystal.
The citric acid crystal can recrystallize and adhere to the surface of grains.
In the Fig.1 a, there are few citric acid crystals on the surface of sodium bicarbonate grains.
Online since: July 2011
Authors: Chuan Chang Gao, Shun Sheng Wang, Song Lin Wang
But the yellow leaf number which fills in controlled alternative furrow irrigation is smaller than that in the conventional furrow irrigation; therefore the disparity will be getting smaller along with crops' growth, playing the promotion role to the leaf area.
Different moisture content processing the area will influence the summer corn's height and the leaf area, and then affect the form of its grain and the grouting advancement finally.
Under different first-flowering mode and lower limit of moisture control, constitute factor of the summer corn like ear length, bald pointed long, spike perimeter, number of grains per ear and kernel weight and 100 grain weight etc is same with its production , also higher degree of water treatment has the advantage.
In the same way, if moisture first-flowering disposal of corn ear is high ,then its spike length will be long, bald pointed long short, ear weeks bald grow, crushed grain, grain number 100 major, These yield components factor in various moisture between treatment is different from each other and the lower floor moisture control, the more obvious difference.
Table3 Product and Composition Factor in Different FI Method and Moisture Disposal Treatments Ear length Rare ear length Ear girth Grain number Seed weigh 100-grain Yield Irrigation Moisture control (cm) (cm) (cm) (grain / mealier) (g/ mealier) (g) (kg/hm2) CFI L-60 16.48BCc 0.56ABb 14.70Aab 416.20Aab 94.09Bab 24.57ABb 4046.44BCb L-70 18.56Aa 0.42Bb 15.04Aa 489.60Aa 100.59ABa 26.10ABb 5489.33ABa L-80 18.90Aa 0.40Bb 15.30Aa 529.00Aa 109.48Aa 27.19Aa 6100.56Aa AFI L-60 14.00Cd 0.64Aa 13.52Ab 321.40Ac 75.88Cc 23.69Bb 3697.78Cc L-70 17.54ABbc 0.56ABb 14.26Aab 380.80Abc 90.28Bab 25.28Bb 5270.25BCb L-80 18.24ABab 0.46Bb 14.80Aab 427.40ab 100.69ABa 26.43Bb 5926.78ABa Conclusions Through measuring pit tests, and the different first-flowering mode and water treatment on summer maize growth and yield of influence, we can make such conclusions: (1) Using alternate between water supply, water control first-flowering way right, which can restrain the corn of redundancy growth effectively and
Different moisture content processing the area will influence the summer corn's height and the leaf area, and then affect the form of its grain and the grouting advancement finally.
Under different first-flowering mode and lower limit of moisture control, constitute factor of the summer corn like ear length, bald pointed long, spike perimeter, number of grains per ear and kernel weight and 100 grain weight etc is same with its production , also higher degree of water treatment has the advantage.
In the same way, if moisture first-flowering disposal of corn ear is high ,then its spike length will be long, bald pointed long short, ear weeks bald grow, crushed grain, grain number 100 major, These yield components factor in various moisture between treatment is different from each other and the lower floor moisture control, the more obvious difference.
Table3 Product and Composition Factor in Different FI Method and Moisture Disposal Treatments Ear length Rare ear length Ear girth Grain number Seed weigh 100-grain Yield Irrigation Moisture control (cm) (cm) (cm) (grain / mealier) (g/ mealier) (g) (kg/hm2) CFI L-60 16.48BCc 0.56ABb 14.70Aab 416.20Aab 94.09Bab 24.57ABb 4046.44BCb L-70 18.56Aa 0.42Bb 15.04Aa 489.60Aa 100.59ABa 26.10ABb 5489.33ABa L-80 18.90Aa 0.40Bb 15.30Aa 529.00Aa 109.48Aa 27.19Aa 6100.56Aa AFI L-60 14.00Cd 0.64Aa 13.52Ab 321.40Ac 75.88Cc 23.69Bb 3697.78Cc L-70 17.54ABbc 0.56ABb 14.26Aab 380.80Abc 90.28Bab 25.28Bb 5270.25BCb L-80 18.24ABab 0.46Bb 14.80Aab 427.40ab 100.69ABa 26.43Bb 5926.78ABa Conclusions Through measuring pit tests, and the different first-flowering mode and water treatment on summer maize growth and yield of influence, we can make such conclusions: (1) Using alternate between water supply, water control first-flowering way right, which can restrain the corn of redundancy growth effectively and
Online since: March 2007
Authors: Dagoberto Brandão Santos, Ronaldo Barbosa, Marcelo A.C. Ferreira, Ricardo Nolasco Carvalho
Experimental Method
A C-Mn steel with chemical composition as follows: 0.20C, 1.44Mn, 0.24Si, 0,12Cr, all numbers in
wt%, was used as experimental material in this research.
The average ferrite grain size was measured as 16 ± 1μm.
The final ferrite grain size is predicted as 16.2μm, as shown in Table 1.
Altering this size to say 500μm, however, did not introduced any significant modification on austenite grain size evolution or in the final outcome of the room temperature ferrite grain size.
A model capable of predicting austenite grain evolution and final ferrite grain sizes was here produced.
The average ferrite grain size was measured as 16 ± 1μm.
The final ferrite grain size is predicted as 16.2μm, as shown in Table 1.
Altering this size to say 500μm, however, did not introduced any significant modification on austenite grain size evolution or in the final outcome of the room temperature ferrite grain size.
A model capable of predicting austenite grain evolution and final ferrite grain sizes was here produced.
Online since: August 2012
Authors: Andrew Carman, Orest M. Ivasishin, Dmytro G. Savvakin, Azdiar Gazder, Elena V. Pereloma
It is clear that a significant number of undissolved alloying particles and pores remain in the microstructure comprising non-lamellar β and lamellar α+β regions.
In the fully sintered condition after step III processing, the microstructure consists of β grains (~145 μm average grain size ) with fine α lamellar precipitation within them and a coarser grain boundary α phase (Fig. 2f).
With further sintering, the microstructure becomes more homogeneous with an increased fraction of the α+β regions and a decrease in the number of pores (Fig. 5a).
By the end of Step III processing, a mostly homogeneous microstructure consisting of β grains (~69 μm average grain size) with finer intergranular α lamellae and grain boundary α is developed.
Contrarily, increased Fe content in 1033 alloy led to the faster pores closure, but accelerated grain growth compared to the standard 1023 alloy [5].
In the fully sintered condition after step III processing, the microstructure consists of β grains (~145 μm average grain size ) with fine α lamellar precipitation within them and a coarser grain boundary α phase (Fig. 2f).
With further sintering, the microstructure becomes more homogeneous with an increased fraction of the α+β regions and a decrease in the number of pores (Fig. 5a).
By the end of Step III processing, a mostly homogeneous microstructure consisting of β grains (~69 μm average grain size) with finer intergranular α lamellae and grain boundary α is developed.
Contrarily, increased Fe content in 1033 alloy led to the faster pores closure, but accelerated grain growth compared to the standard 1023 alloy [5].
Online since: August 2012
Authors: Paola Bassani
From the first step image quality (IQ or PQ, pattern quality) parameter, that is related to the number of detected bands and hence the quality of the pattern, is generally derived.
Secondary analyses are performed after map collection, in order to obtain additional information such as number of detected phases and relative quantities, in case of multiphase samples, or grain size, orientation distributions, texture.
Thanks to the great calculation capabilities now available, and to the development of dedicated subroutines or special analyses software [19-22], information related more interestingly to grain boundary misalignment, grain rotation inside grains, geometrically necessary dislocations (GND) can now be obtained.
As reported in Fig. 2-b, as EBSD related publications are constantly growing, also SMA/EBSD related publications are increasing, especially in the last five years, even if on the bases of much reduced numbers.
Also more recent works pointed out that previously unreached performances can be obtained in nanocrystalline NiTi [71], but this effect seems to be more related to texturing effects than to grain size: experimental and modeling results on single crystal and strongly textured polycrystals with same orientation, indicate that the presence of grain boundaries does not significantly affect the macroscopic aspects of stress induced martensitic transformation [72], until grain size is of the order of micrometers: local stress field at grain boundary from transforming grains promotes the spread of martensite into neighboring grains.
Secondary analyses are performed after map collection, in order to obtain additional information such as number of detected phases and relative quantities, in case of multiphase samples, or grain size, orientation distributions, texture.
Thanks to the great calculation capabilities now available, and to the development of dedicated subroutines or special analyses software [19-22], information related more interestingly to grain boundary misalignment, grain rotation inside grains, geometrically necessary dislocations (GND) can now be obtained.
As reported in Fig. 2-b, as EBSD related publications are constantly growing, also SMA/EBSD related publications are increasing, especially in the last five years, even if on the bases of much reduced numbers.
Also more recent works pointed out that previously unreached performances can be obtained in nanocrystalline NiTi [71], but this effect seems to be more related to texturing effects than to grain size: experimental and modeling results on single crystal and strongly textured polycrystals with same orientation, indicate that the presence of grain boundaries does not significantly affect the macroscopic aspects of stress induced martensitic transformation [72], until grain size is of the order of micrometers: local stress field at grain boundary from transforming grains promotes the spread of martensite into neighboring grains.
Online since: June 2014
Authors: Paul A. Rometsch, Xin Hua Wu, Zhou Xu, Hao Zhong, Huai Yang, Lin Ju
Grain size strengthening - decreasing the grain size of the material, and/or
4.
Work hardening - increasing the number of dislocations in the material.
Number of substitutional solute atoms in solution, 3.
Grain/sub-grain boundary area (i.e. decreasing the grain size of the material), 4.
Number of vacancies and/or interstitials in the material.
Work hardening - increasing the number of dislocations in the material.
Number of substitutional solute atoms in solution, 3.
Grain/sub-grain boundary area (i.e. decreasing the grain size of the material), 4.
Number of vacancies and/or interstitials in the material.