Search results

However, there are a number of limitations to this method.
In the polycrystalline metals into the temperature interval 0.5...0.6 Тm, the grain-boundary relaxation takes place.
It is caused by an inelastic behavior of the grain boundaries.

Meanwhile for the open bearings system ，it is unsuitable for application in the situations with particles in pumped medium because its hidden performance and anti-wear performance for grain are poorer.
Thirdly，it has good performance for foreign bodies buried，not sensitive to sediment and good anti-wear grain of abrasion, its friction coefficient is greatly reduced in state of water lubrication.
According to a large number of test and previous work， Marcus Allen[6] puts forward the abrasion of "double mechanism ",it can explain the qualitative analysis for bearing material wear phenomenon， but can not be used in quantitative analysis for wear of a certain specific materials[7].

By research and operational experience, it has been established that the microstructure of high-speed R6M5K5 steel produced by the traditional method (fig. 2a) is characterized by nonuniform grain size and nonuniform distribution of the carbide phase (light spots).
Microstructure of forged high-speed steel (a) and powder steel (b) By contrast, when pressed parts are produced from metallic powders that have been generated by spraying, their microstrukture is characterized by small grain size and excellent uniformity, and pressed steel tools are very strong and ductile.
The number of displacement cycles depended on cutting modes, quality parameters and geometrics of the cutter, machine stiffness, and other factors.

Number marks were fabricated on the surface of CVD graphene through lithography and E-beam evaporation to locate the position where AFM and Raman spectra were taken before and after annealing.
[8] Yu Q K, Jauregui L A, Wu W, Colby R, Tian J F, Su Z H, Cao H L, Liu Z H, Pandey D, Wei D G, Chung T F, Peng P, Guisinger N P, Stach E A, Bao J M, Pei S S and Chen Y P, Control and characterization of individual grains and grain boundaries in graphene grown by chemical vapour deposition, Nature Mater. 10 (2011) 443-449

Recent studies showed that the crystallographic textures exist in the optical grade free-standing diamond films and the distributions of grain orientations strongly affect the properties, performance and reliability of the diamond films.
Diamond films are polycrystalline materials, in which the grain orientations may be randomly distributed or preferentially distributed to form {hkl} fibre textures.
It can be found in diamond octahedron that the number of <100>, <111> and <110> growth directions is 3, 4 and 6 respectively.

Because of its small strength, high volumetric fluctuation amount, and large compressibility, the type of soil presents a large number of problems.
Figure. 1 shows the utilized clay's grain size distribution, which revealed 66% clay, 31% silt, and 3% sand.
Distribution of the grain size of clay used. 2.2 Okra Tips Plant Okra polysaccharides are non-toxic, biodegradable, biocompatible polymers and are chemically inert as shown in the figure. 2.

According to the grinding theory, the tangential grinding force Ft is mainly composed of two parts: one is the force of the grains that makes material produce plastic deformation and ductile regime removal, the other is sliding friction between the grains and workpiece material.
According to a large number of experiments and analyses, the corresponding characteristic frequency range of ductile and brittle removal of ZTA ceramics are fd=200-250KHz and fb=450-500KHz respectively.

According to the ratio of stoichiometric number, the required glycine and inorganic salts can be determined.
According to Scherrer equation L=0.94λ/(βcosθ) [12,13], where L is grain diameter, λ is the wavelength of the incident X-ray, β is the diffraction peak full width at half maximum (unit: radian), and θ is the diffraction peak corresponding to the incident angle.
What can be seen very clearly from Figure 2(B) are the inerratic continuous lattice lines of Nd1.9Al0.1Zr2O7 nanocrystals, indicating the sample has full crystallization, and the grain boundary can be seen clearly.

Preface With past few decades, the development of micron-nanoscience, a large number of published literature and patents of invention can infer that researchers made a lot of research at the micron-nanotechnology.
Silvia et al.[10] with titanium tetraisopropoxide as precursor using the MOCVD method at 400℃ nanotubes coated with a layer of TiO2 crystal grain size of about 55nm, and maintain the original anatase TiO2 crystalline phase. 2.3 Hydrothermal and solvothermal syntheses This process is that under certain pressure and temperature, the material was dissolved in some solvent medium and recrystallized.
Guimin et al.[12] by hydrolysis of titanium tetraisopropoxide in supercritical ethanol succeeded in making carbon nanotubes be coated with a layer of anatase TiO2 grains which diameter less than 7nm, the effect was significantly better than the direct mixture of TiO2 and carbon nanotubes for degrading the phenol.

Temperature [°C] 800 900 Milling time [h] 3 6 9 3 6 9 Specimen number Hardness [HV] Hardness [HV] 1 F1 46.4 40.49 39.61 38.6 46.47 34.65 F2 62.5 36.49 34.65 47.9 44.87 33.17 2 F1 57.4 44.66 36.88 46.8 45.55 44.90 F2 63.0 38.82 31.07 45.7 43.48 38.75 3 F1 54.0 40.98 34.05 45.1 40.49 36.17 F2 47.9 39.07 31.40 49.8 49.97 36.94 4 F1 51.0 38.52 34.81 51.7 42.87 38.41 F2 49.1 37.31 34.87 47.3 51.46 36.94 5 F1 58.6 56.50 32.02 50.9 50.16 38.37 F2 44.2 46.37 31.30 46.5 49.50 38.50 Average 53.41 41.92 34.07 47.03 46.48 37.68 Two measurements were obtained from each specimen, one corresponds to the side parallel to the direction of application of compression (Face 1: F1), and other is from the face parallel to the direction of application of compression (Face 2: F2).
In the specimens with 9 h of milling and sintered at 800 ° C there is the presence of irregular grains which causes the decrease in hardness.
Hug, “Influence of spark plasma sintering conditions on the sintering and functional properties of an ultra-fine grained 316L stainless steel obtained from ball-milled powder,” Mater.