Search results

Software for the simulation of X-ray powder diffraction (XRPD) patterns for ultrafine- grained materials with some kinds of imperfections has been developed.
Simulation method Model is built as a statistical sequence of a finite number of different kinds of 2D-periodic layers.
At the second step the scattering intensity distribution along hk rods for finite number of layers in the statistical stacking sequence is calculated by the use of matrix formalism [4].

The number of solder joints has dramatically grown even if the size of interconnections has been drastically reduced.
While lead-free solder's wettability, mechanical properties, and grain refinement are significantly impacted by strengthening micro and nanoparticles [16, 17].
Thus, a growing number of researchers are concentrating on the production and performance characterization of composite solders boosted by various particles.
Sn-Zn solders have a number of intriguing characteristics, including a low price and a 220°C reflow temperature.
The main purpose of the study was to analyze recrystallization of the grains and how it effects the reliability of the solder joint.

The dependence of HSC on porosity, ratio of heat storage coefficients, grain sizes and the shape of the particles is a matter of concern to engineers, architects and physicists.
Let the grains of the solid phase be ellipsoidal having principal axes 2a, 2c & 2a (aLet these grains be located at the corners of a simple cube of side 2b each.
To test the dependence of porosity correction term on physical observable quantities, a number of combinations were tried to obtain the exact mathematical relation.
This may be due to the formation of thin film around to grains of the solid by water, which causes increase in the experimental value of HSC.

In the medium of NaCl corrosive solution (3.5 wt%), the highest number of pitting holes is found in specimens with no surface treatment; the number is 87, followed by the diameter of the pitting in the corroded area with a value of 182.21 μm.
From Figure 16, there is an even distribution of the above phases along the grain boundaries.
The behavior of pitting corrosion after surface treatment is obtained; the number of pitting before treatment is 87, and the number of pitting after surface treatment with the 2-molar concentration cyclic voltammetry method is 21.
Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel. steel Res Int [Internet]. 2019 Oct 28; 90 (10).
Effect of grain size on pitting corrosion of 304L austenitic stainless steel.

The specimens are subjected to repeated blocks of cycles made up of one or several overloads separated by a variable number of baseline cycles and two baseline stress ratios.
The alloy is in a normalized state and the microstructure is ferriticpearlitic with a grain size about 50 µm.
The number of baseline cycles between overloads or underloads is set to be 1 000 (1k cycles) or 10 000 (10k cycles).
The number of overloads (OL) and underloads (UL) consecutively applied were 1 or 6.
The effect is reinforced if a higher number of underloads are applied.

The results show that under the conditions of 1250°C melting 1130°C crystallization process crystal spontaneous growth in crystalline glaze can be able to cover the entire glazed, shape of crystals was feathered, cross growth, the number of crystal increased with crystallization temperature, glaze was smooth and shiny sense.
Table 1 Formulation of the main raw materials for the level and form factors Level and form factors TiO2 / % ZnO / % Coke gemstones / % 1 24.5 12.1 11.6 2 19.5 10.1 8.6 3 14.5 8.1 5.6 Table 2 Table for the main raw material ratio of the orthogonal experiment Serial number TiO2/ % ZnO/ % Coke gemstones / % Glass dust/ % CuO/ % 2-1 24.5 12.1 11.6 51.5 0.3 2-2 24.5 10.1 8.6 56.5 0.3 2-3 24.5 8.1 5.6 61.5 0.3 2-4 19.5 12.1 8.6 59.5 0.3 2-5 19.5 10.1 5.6 64.5 0.3 2-6 19.5 8.1 11.6 60.5 0.3 2-7 14.5 12.1 5.6 67.5 0.3 2-8 14.5 10.1 11.6 63.5 0.3 2-9 14.5 8.1 8.6 68.5 0.3 Analysis and Discussion Microscope test results and analysis.
As can be seen from Fig. 2, rotary material reproduced units, the photos have the color change, indicating that precipitation of crystals in the glaze instead of equiaxed grains department of crystals, but the color did not change significantly, in the polarizing microscope showed many purple, green and black, indicating that its obvious pleochroism, crystalline glaze in precipitation for the long columnar crystals.
Fig.3 XRD pattern of sample 2-7 Fig.4 XRD pattern of sample 2-8 Summary The use of orthogonal experiment at a large number of raw material formulation, sintering temperature and crystal flower growth temperature rutile crystalline glaze, such as the impact of the factors that select the best, make decorative materials suitable crystalline glaze formula for raw materials: TiO2: 14.5%, ZnO: 10.1 %, coke gem: 11.6%, glass: 63.5%, CuO: 0.3%.

Effect of reaction time on the experiment Number Reaction time Peak position(nm) morphology a 1h 420 particle b 2h 350 400 wire, particle c 2.5h 350 390 wire Chart 1shows that silver nanometer wires are not generated within 1h.
With the extension of reaction time, the grain began to dissolve and grow into nanometer wires because of the Ostwald Ripening Effect.
The effect of additive concentration on the product Number Additive agent Mole ratio Peak positon(nm) Morphology a KBr 1:8 420, obvious particle b KBr 1:50 350 400，obvious wire c KBr 1:100 430, not obvious particle We can see from table 2.2, when the concentration of KBr is too low, Br- could not reduce the concentration of silver ion effectively.
Effect of reaction temperature on the product Number Temperature(℃) Peak position(nm) Morphology a 154 420 particle b 157 350 400 420(main) particle, wire c 160 350 390 wire d 163 350 390 wire e 167 450 not obvious wire, particle From the chart 3, experiment under 160-163 ℃ can obtain pure nanowires. 
And when the temperature is too high, then a large number of crystal nucleuses would be formed in a short period of time, and end up with spherical colloids.

Device quality SiC wafers are extremely expensive and available from only a limited number of vendors.
In the past two years a number of suppliers have entered the market in a significant way.
Polytype inclusions, low angle grains, precipitates, strain and micropipes are typically observable either by eye or under microscopic illumination.

The number of element in the workpiece is 360, and the number of nodes is employed.
The number of elements in the workpiece is 360, and the number of nodes of the workpiece is 399.
Gontarz, “Influence of deformation parameters on grain size of AlSi1Mg alloy in forging”,Journal of Materials Processing Technology, Vol. 138,p p.196-200, 2003

A single particle has the nature of the general solid, but the powder that is composed of a large number of particles is different to the scope of the solid, liquid and gas, and show unique properties.
In the model of discrete element method (DEM), determine the main stiffness value is to ensure deformation between the grain (namely stack quantity) far less than the diameter of the particle.
（a）Unbalanced force change on blade（b）Force of blade in the Z direction Fig.1 Force of 5 screws blade （c）Unbalanced force change on blade（d）Force of blade in the Z direction Fig.2 Force of 4 screws blade 4 Analyze the results With different number of spiral blade for numerical simulation, from figure 1 and figure 2, we can get the following conclusion in a single particle size binary powder particle system: (1) Through the simulation, with same speed case, paddle’s thread with 5 numbers can get powder more relative uniformly than 4 numbers, or can think hybrid speed faster, the mixing effect is better