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Online since: June 2018
Authors: Karel Dvořák, Jana Stachová, Dorothea Sklenářová, Dušan Dolák
Crystallite can be considered a number of cells with crystalline structure that are systematically linked and are creating coherently diffracting domain.
β=B2-b2 (2) β… Full peak width at half maximum height after correction [rad] b… error of peaks due to imperfections of the device [rad] Scherrer equation after modification: L=K∙λcosθ∙1B2-b2 (3) Scherrer constant K is shape factor and takes values according to the shape of the grains.
LO1408 "AdMaS UP - Advanced Materials, Structures and Technologies", supported by the Ministry of Education, Youth and Sports under "National Sustainability Programme I" and by project No. 15-08755S: "Study of the effects of samples preparation on the final properties of inorganic binders" and project number FAST-J-17-4604 “Monitoring the properties of the limestone during thermal loading by DKTA, DSC and XRD-HT methods”.
Online since: March 2016
Authors: Yang Gao, Shi Feng Shi, Jian Jun Tian, Chao Wang, Yong Ji Niu, Zhi Wei Zhang, Ning An
A large number of γ'phase in a very short time precipitate rapidly from the matrix during cooling, the second γ'phase with lager size is precipitated at high temperatures, and with smaller size, γ'phase is precipitated at lower temperatures Fig. 1 DZ417G directional solidification phase morphology.
The main precipitates carbide is MC and M6C carbide, and a small amount of M23C6 carbides, thus preventing the grain boundary sliding and improving high-temperature creep strength of the alloy.
Ren, A dramatic increase in dendrite number for directionally solidified superalloy DZ417G with a strong static magnetic field, Mater.
Online since: September 2013
Authors: Wei Sheng Wu, Hubert Lee, Lee Kuo Lin
Literatures Review RH is commonly known as rice hull, is the remaining waste after the rice grain plant which is made into rice.
Table 2 Every m3 RHA replacement of 20% cement can reduce the amount of CO2 and the corresponding number of Lauan Tree Items Traditional cement 20% RHA replacement W/B 0.24 0.24 Revise W/B - 0.4 RHA replacement (%) 0 20 Amount of cement (kg/m3) 667 534 Amount of RHA (kg/m3) - 133 CO2 reduction (ton/m3) - 0.113 The equivalent amount of planting lauan trees decrease in the number of CO2 emissions - 3.1 Note 1: The diameter of 50 cm per plant, height of 15 meters lauan tree can absorb about 1 year of 37 kg CO2 Note 2: Reference from the Department of Forestry, National Taiwan University Professor Song-yong Wang - Wood materials on the environmental effects of carbon dioxide sequestration [8] Conclusions and Suggestions 1.
Online since: April 2014
Authors: Guo Dong Wang, Shuai Hou, Yu Jia Liu, Fuan Hua, Xin Yue Wang, Zhao Dong Wang, Yong Li, Jian Guo Li, Jia Dong Li
After the heat treatment of air flotation oven, the aluminum strips can get good surface quality, high performance, large grain size[1].
Then the fitness function is as follows: (6) Where N is the number of individual model, Yi is the flotation height.
Other parameters such as c1, c2, vmax, tmax, wmax, wmin. 2: while inumber of generations or the required accuracy is reached, then 8: break; 9: else 10: go to step 3 11: end if 12: end while Output: giving the best optimization parameters to lssvm.
Online since: August 2011
Authors: Ri Gao, Lei Zhang
The grain size of quartz sand is divided into three: Coarse (1.0~0.63mm), Middle size (0.63~0.315mm) Fine particle size(0.315~0.16 mm).
Table 5 Amount and percentages of the two distribution forms of steel fiber within 5mm from the bottom Orthogonal Oblique crossing Total number A1 252 (82.4%) 54 (17.6%) 306 A2 142 (63.4%) 82 (36.6%) 224 A3 104 (55.9%) 82 (44.1%) 186 A4 327 (78.0%) 92 (22.0%) 419 In Table 5, Orthogonal means the steel fiber and crack are essentially vertical and Oblique crossing means the angle is not more than 45 degrees.
Table 6 Amount and percentages of the two failure modes of steel fiber within 5mm from the bottom Pulled out from concrete Snapped Total number A1 294(96.1%) 12(3.9%) 306 A2 215(96.0%) 9(4.0%) 224 A3 173(93.0%) 13(7.0%) 186 A4 401(95.7%) 18(4.3%) 419 Conclusions and recommendations Through the above analysis of simply supported RPC plate experimental data, the conclusions can be drawn as follows: 1) Assuming that the tensile stress of the cracking section bottom is uniformly distributed along the width direction, the average stress calculated by the bending theory of elastic thin plates before cracking is close to the one obtained from the measured result.
Online since: July 2020
Authors: Krzysztof Labisz, Tomasz Tański
This tool has a lot of application possibilities also for a great number of surface treatment processes, which include solid-state phase transformation as in surface hardening, melting and vaporization as in laser surface alloying, impart beneficial residual stresses in materials as in laser shock peening, modified surface areas in laser ablation or to fuse metallic powders as in selective laser sintering/melting.
The use of magnesium as a substrate and the use of high laser power values selected so as not to cause the material to boil may cause mixing of magnesium and aluminium in the resulting top layer, thus causing intentional changes in the microstructure consisting in the formation of new inter-metallic phases and fragmentation of the structure and grains, which in turn leads to reinforcement of material in the surface layer.
Physical and mechanical properties of the ceramic carbide and oxide powders Properties SiC Al2O3 Density, kg/m3 3.44 3.97 Hardness, HV0,05 1600 2300 Melting temperature, °C 1900 2047 Thermal expansion coefficient a, 10-6/ºC 4.0 7.4¸8.5 Grain size, µm 100 120 Table 4.
HPDL laser parameters Parameter Value Laser wave length, nm 940 ± 5 Peak power, W 100÷2300 Focus length of the laser beam, mm 82 /32 Power density range of the laser beam in the focus plane [kW/cm²] 0.8÷ 6.5 Dimensions of the laser beam focus, mm 1.8 x 6.8 For analysis of the obtained microstructure, light microscope techniques were applied, using a common Leica-Zeiss metallographic microscope together with the bright field observation method, allowing the discovery of zones, grains and precipitates occurring in the surface layer.
There is no evidence for dissolving of the ceramic powder SiC grains, because the carbon concentration in the Al matrix will be possible to measure and visible on Fig. 12.
Online since: December 2024
Authors: Nosir Saidmakhamadov, Jamshidbek Khasanov, Nuritdin Tadjiev, Omonjon Yuldashev, Fakhriddin Makhmudov, Ibrokhim Sodik Nosirkhujaev, Zokirjon Nurdinov, Nozimjon Kholmirzaev, Bekzod Yusupov, Nargiza Sadikova
As a result, it increases the number of crystallization centers of the alloy and to form the same fine-grained structure.
In the microstructure of this 35XGCL (analog is JIS G 5111) steel alloy, uniformly fine-grained TiC particles serve to improve the main wear resistance property.
The wear resistance of the research samples was improved by 1.11, 1.2, and 1.31 times, respectively, compared to the non-modified 35XGCL (analog is JIS G 5111) brand steel alloys. 35XGCL (analog is JIS G 5111) brand steel alloy was modified with TiC nanopowder particles in the liquid state outside the furnace to form a uniform fine-grained structure.
Online since: November 2012
Authors: Jian Ming Gong, Hai Tao Wang, Cheng Ye, Bin Liang
At the macro level (an average for a large number of domains with any orientation) for materials with positive magnetostriction, permeability increases with tensile stress along the field axis, and decreases with compressive stress along the field axis [23].
It is an important factor that the crystal grain in HAZ is more coarse than in base metal (Fig. 4a, and b).
It is well known that sliding deformation of coarse grain induced by residual stress is easier in the HAZ, and it accelerates magnetic domain movement, which result in Hp(y) component changes quickly.
Subsequently, the Hp(y) component will continue fast rise with tensile stress σy are rapidly increasing, though the crystal grain in welded seam is finer than in base metal (Fig. 4a, and c).
Online since: December 2012
Authors: Nivaldo Lemos Coppini, Daniel Benedito da Rosa, Edson Melo de Souza, João Honorato, Gerd Erwin Ernst Gojtan
Finally, this work allowed also concluding that both DOE and deterministic methods can be used to optimize cutting process parameters taking a small number of results collected from factory shop floor during the process evolution.
Its specification is HN44105522022S HN series of 7151, which corresponds to a mill cutter to top-edge of spherical solid carbide (micro grains).The mill cutter has nominal diameter is 6 mm, two inserts coated with TiNAl and angle of de helices of 15º.
[R$]; Kft = cutting tool life cost [R$]; Zt = number of parts machined per cutting tool life; Vsi = tool holder initial cost [R$]; Nfp = average tool holder life, in quantities of tool cutting edges; Kpi = acquisition cost/per tool cutting edge [R$]; Ns = number of tool cutting edges/per insert; Table 1.
Online since: May 2023
Authors: Daniel J. Lichtenwalner, Sei Hyung Ryu, Scott Allen, John W. Palmour, Brett Hull
Note that higher mobility typically is tied to lower interface trap levels (density (DIT traps/(eV*cm2)) or total number (NIT, traps/cm2)); although mobility could be enhanced by other things as well, such as reduced interface roughness or reduced number of near-interface (oxide) traps (NIT or NIOT).
To understand the electrical properties of the channel most completely, measurements to separate out the various mobility limiting effects would ideally be performed, as in a number of reports [4, 10-13].
Besides the materials properties listed, the alternative dielectric should satisfy these main conditions: 1) form an interface with low trap densities (or be a diffusion barrier for passivation elements); 2) have appropriate band offsets to minimize Fowler-Nordheim tunneling; 3) remain amorphous or not have high defect density (within grains or at grain boundaries); 4) be stable under the processing conditions required for MOSFET fabrication; and 5) display low failure rates relating to time-dependent dielectric breakdown (TDDB) and threshold instability.
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