Search results

Strain of Grains.
The total number of grains used for the measurement was about 240.
The numbers of measured grains is about 240.
Namely, the grain shape mainly affects the rotation of grains
(3) The standard deviation of the strain among grains is small for those grains with large grain size.

Introduction Because of many factors troubled food security are still exist, there are still a number of global population faces food crisis.
Total grain output.
In the technology conditions remain unchanged, under the prerequisite of one country resources means that the country the reduction of the number of total grain output and supply drop; And a decrease in the level of agricultural production technology means that the same input can only get fewer food production.
Import rate of the grain.
Grain output volatility.

It was also observed, during electrical measurements, that increasing the number deposited layers directly increased the overall capacitance of the thin-film structure.
The ZrO2 morphology showed grains from 6 to 10 nm of average size.
These large grains were associated to the perovskite phase only.
The 9 PZT sample showed large grains (bigger than 300 nm) and apparently were produced from collapsing and assemblage of small and medium grains.
Samples of 3 PZT, 6 PZT and 9 PZT showed small grains (~12 nm), large grains (100 - 300nm) and very large grains (> 300nm), respectively.

A number of processes have been developed following this philosophy, namely equal-channel angular extrusion (ECAE), accumulative roll bonding (ARB) and multi-axial forging (MAF).
At low strains, large number of dislocations are generated, which align themselves in a low energy configuration forming low angle grain boundaries (LAGBs).
The grain size measured by EBSD was ~300 nm.
With increasing number of cycles, the yield stress as well as the ultimate tensile stregth of the material increased, however, the tensile elongation decreased.
An overall low ductility is observed, although, both uniform and total elongation is seen to increase with number of cycles.

As a result we get a large number of tiny grains.
Because the grain boundary atoms are arranged in disorder, and there are a large number of defects such as dislocations, empty.
Besides on both sides of the grain size of a grain boundary to different, so it will hinder dislocation from one grain to another grain movement.
The number of toughening nest became fewer, and its morphology is smaller.
Toughening nest increase in the number with smaller in size, uniform in morphology, no particles.

F(g)max = 9 F(g) = 6 F(g) = 6,3 F(g) = 6 TD RD ND (a) (b) Fig. 2 : (a): Substructure of the {111}<110> grains after 35% tensile strain, (b): diagonal size of diamond cells, the number of measurements N = 60.
TD RD ND 0,2 0,4 0,6 0,8 1,0 0 5 10 15 Frequency Diameter (µm) N = 60 (a) (b) Fig. 3 : (a): Substructure of the {001}<110> grains after 35% tensile strain, (b): size of equiaxed cells, the number of measurements N = 60.
Nuclei G1 and G2 are located at the grain boundary, G3 is located at the grain centre.
The "bulging" is the growth of a nucleus into the neighbouring grain of different orientation by migration of the grain boundary.
Thus, if the nucleus is formed at the grain boundary (or at the grain boundary vicinity), it invades easily its neighbouring grain.

Deformation behaviour of an ultra-fine grained Al6082 alloy I.
These include the development of bimodal microstructures [1, 2, 4, 5], deformation at high strain rates and/or low temperatures [2], introduction of nano sized precipitates into ultra-fine grains [7, 8], twinning induced plasticity (TWIP) [9], and a number of other strategies which have been described in detail in a review by Ma [10].
Grains were somewhat elongated, while subgrains had a nearly equiaxed shape.
Such a mixture of high and low angle grain boundaries is typical of metals and alloys processed by ECAP [6].
Therefore, it was suggested [11, 12] that the formation of micro shear bands is 526 nm 10 µm 10 µm 152 nm 10 µm 10 µm due to localisation of plastic deformation at grain boundaries or, more specifically, cooperative grain boundary sliding.

Though there are a number of papers on the materials of CCTO, the mechanism of the giant dielectric constant is still not clear [3-6].
This indicates that the abnormal grain growth occurs.
In Fig.2 (a), some large grains are observed in size of about 30-70 µm, whereas, some grains are as small as 2 µm.
The residual pores are observed within the large grains, indicative of fast grain growth.
Nevertheless, the grain size decreases with the Fig.1.

Whether and how many polymer particles will be adsorbed on the cement grain in the polymer-modified cement composites (PCC) is still a question.
In this paper the possibility and the test method of adsorption of polymer particles on the cement grain were reviewed.
Through comparison of Fig.1 and Fig.2, strong adsorption of polymer particles on the cement grain (disappear of the peak in polymer particle size are) and dispersion effect of the latex on the cement paste (shift of the peak in cement grain size area to the side of small particle diameter) can be observed.
This is a useful tool for the investigation of the interaction between the cement grain and admixture.
So no matter what charge shows the cement grain as a whole, which can be detected for example by the zeta potential measurement, the cement grain can absorb both positive and negative charged particles.

Grains of the top of the work-piece were refined.
Grain size after upsetting Fig.4.
Upsetting helped the grain refining largely in the heart of work-piece, but made the distribution of grain size inhomogeneous while stretching could make the distribution of grain size on the work-piece homogeneous, and the grain size was refined by the increase of drawing steps.
The grain fineness number of this part was tested as 6.5.
The grain fineness number of the middle part of steering extending arm was tested as 6.5.