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Online since: April 2013
Authors: Surasak Suranuntchai, Viton Uthaisangsuk, Apichat Sanrutsadakorn, Borpit Thossatheppitak
The numbers in the diagrams represented percent efficiency of power dissipation.
Obviously, large amounts of recrystallized grains were found for both conditions.
Due to the high deformation temperature, higher driving forces for recrystallization were generated and it was easier for newly recrystallized grains.
Online since: November 2011
Authors: Sergey Prokoshkin, Vladimir Brailovski, Yann Facchinello, Thomas Georges
By increasing the rolling temperature, alloy ductility should be improved, resulting in a lower mechanical damage of the final product without compromising the processing grain refinement capacity.
In Fig. 4, typical evolutions of the initial εi, permanent εp and two-way εTW strains are plotted as functions of the number of cycles for five processing routes.
In Fig. 5, the recovery stress evolution is plotted as a function of the number of cycles for all processing routes.
The maximum recoverable stresses, the number of cycles at failure Nf and the stress recovery degradation rate are collected in Table 3.
Those tests were used to determine the recovery stress and strain as well as the number of cycles at failure.
Online since: November 2020
Authors: Liana Rahmayani, Dwi Septiani, Dheya Amelia Ginting, Iin Sundari, Viona Diansari
The number of specimens used in this study amounted to 20 specimens.
Specimens were then divided into two groups, namely Group A (Number 10 specimens, the Fuji IX type II GIC) and group B (number of 10 specimens, the type II GIC added 5% nanoparticle silica).
However, the 2 GIC type II specimen has a larger number (19.1 μm) compared to silica modification (11.0 μm).
The presence of granular grains on cement powder and liquid also add to the strength of its adhesions, where granular grains act as fillers that will fill the adhesion bond between the restoration and teeth.[12] Researchers suspect on GIC silica modification has better properties compared to GIC type II (Fuji IX) because it is better to bond the enamel formed compared to dentin.
Online since: June 2008
Authors: Pierre Fauchais, Ghislain Montavon
., nano-sized particles, which could permit to form finely grained coatings.
Jodoin [16] has shown that the design of the Mach number of an air nozzle should be limited to 1.5 and above to avoid too high temperature.
To reduce the intensity of this bow shock, the Mach number must be reduced [16].
After a heat treatment above the crystallization temperature (568°C which is less than half melting temperature), the structure of the coatings is devitrified into a multiphase nano-composite microstructure with 75 to 125 nm grains containing a distribution of 20 nm second-phase grain-boundary precipitates [276].
Recently, a grain-growth inhibitor was developed to prevent WC dissolution in the binder, not only maintaining very small grains, but also maintaining their original shape; its drawback is that it decreases the cohesion between WC and binder [310].
Online since: April 2014
Authors: Helmut Mehrer
They owe many of their favourable properties to their amorphous structure, which does not contain lattice defects such as grain-boundaries and dislocations.
Later SSAR has been detected for a number of combinations of metals.
The crystallised sample has a complicated two-phase microstructure with a high density of grain- and phase-boundaries, which may act as diffusion short circuits
The number of atoms participating in a collective jump event depends on the composition of the glassy metal..
The diffusion profiles were analysed by the authors assuming type-C kinetics of grain-boundary diffusion.
Online since: August 2015
Authors: Frank Czerwinski, Dao Lun Chen, S.K. Shaha, W. Kasprzak, J Friedman
As revealed by a number of experimental techniques, Cu and Mg rich phases along with the eutectic Si dissolved in the temperature range from 300 to 500oC.
INTRODUCTION Aluminum cast alloys have proven to be attractive structural materials for a number of automotive applications including strategic powertrain components such as engine blocks and cylinder heads.
As revealed by microscopic examinations, phases containing transition metals, which nucleated during alloy solidification, frequently with a plate shape, grew both in inter-dendritic regions and across α-Al grains.
As revealed by a number of experimental techniques, Cu and Mg rich phases along with the eutectic Si dissolved in the temperature range from 300 to 500 oC.
Online since: February 2017
Authors: Peter Olegovich Rusinov, Zhesfina Blednova
Increasing the time of mechanical activation leads to more fine-grained powders.
The flow of energy supplied to the powder particles is determined by the number of balls.
With increasing number of balls stream, the generated energy increases, the temperature increases with the frequency of collisions, this also leads to a more rapid grinding of the powder particles.
Acknowledgements This work was performed as part of State Task № 9.555.2014/K, with the financial support of the Ministry of Education and Science of the Russian Federation and President Grant number МК-5445.2016.8.
Online since: December 2014
Authors: Jun Feng Xu, Wei Liang Dong, Dian Guang Ma
Experiments were conducted over four asymmetric dunes of one crest length (4 m), two crest height (0.3m,0.4m) and two uniform sediments with mean grain sizes D=0.5 and 0.7 mm at the TianJin Research Institute For Water Transport Engineering, China.
A number of studies have been conducted in the past 60 years, which are focused on the analysis of the distribution of turbulence energy density and Reynolds shear stress along the dunes.
Based on the concept of dimensional analysis, Karman and Prandtl proposed power law of velocity distribution as follows: (1) In Eq. (1), U is depth-averaged velocity; m related to the Reynolds number and the roughness, is , and m=1/6 in this paper; =z/d is the relative depth, respectively.
Through comparison analysis of a large number of natural and experimental data, Zhang held that Eq. (1) is better than logarithmic law, since it is closer to the actual situation in the near-wall region with little deviation [12].
Online since: June 2019
Authors: František Kresta, Lucia Bulíková
In the last time a number of new hydraulic road binders with fly ash as their component have been prepared and used.
Table 4: Total parameters of tested binder Compressive strength after 56 days Fineness of grind Initial setting time Bulk stability Sulphate content Strength class 14.5 MPa 14.8 % 175 min 1 mm 1.45 % N 2 Value of fineness of grinding showed that a high share of coarser grains is located in the structure of fly ash after denitrification after sifting with sieve of 90 μm mesh site.
Online since: September 2017
Authors: Nicanor Cimpoeşu, Nicoleta Monica Lohan, Leandru Gheorghe Bujoreanu, Lucian Burlacu
The capacity to develop TWSME was revealed by the change in displacement-temperature variation, with increasing the number of training cycles.
Mechanical grinding was performed with a diamond covered disk and abrasive papers with decreasing grain size, with water cooling, as well.
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