Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: June 2021
Authors: Wen Xiao Qu, Yong Qi Zhu, Qing Liu, Li Chun Qi
The TEM observation results are consistent with the results shown in Fig. 1 (b), indicating a large number of α″ martensite in the interior of Ti-33.5 Nb-4Sn alloy.
Here it is concluded that a large number of lath-shaped α″ martensite forms in the interior of Ti-33.5 Nb-4Sn alloy, and a few ω phase distributes around α″ martensite.
By the measurement of grain surface spacing and the calibration of spots, the orientation relationship between the α″ martensite and β phase is determined to be (110)β∥(002)α″, (020)β∥(022)α″ and [001]β∥[100]α″.
Suppression of isothermal ω phase by dislocation tangles and grain boundaries in metastable β-type titanium alloys, Journal of Alloys and Compounds. 2013, 50, 35-38
Here it is concluded that a large number of lath-shaped α″ martensite forms in the interior of Ti-33.5 Nb-4Sn alloy, and a few ω phase distributes around α″ martensite.
By the measurement of grain surface spacing and the calibration of spots, the orientation relationship between the α″ martensite and β phase is determined to be (110)β∥(002)α″, (020)β∥(022)α″ and [001]β∥[100]α″.
Suppression of isothermal ω phase by dislocation tangles and grain boundaries in metastable β-type titanium alloys, Journal of Alloys and Compounds. 2013, 50, 35-38
Online since: July 2021
Authors: Rostislav Drochytka, Zarina Saidova, Jindřich Melichar, Grigory Ivanovich Yakovlev, Ekaterina V. Begunova, Igor Aleksandrovich Pudov
Besides, there is a number of industries that require maintenance of low dust levels, which is achieved by facing the interior surfaces with expensive materials, such as marble.
Determination of electrical conductivity of samples using E7-20 meter RLC Results and Discussion It was noted that the fluorohydrite matrix had a large number of micropores, filled with pore solution containing sodium cations.
Repin - Modification of the structure and properties of fine-grained concrete with carbon black dispersion/ [8] Yakovlev G.I., Pervushin G.N., Gordina A.F., Shaibadulina A.V., Saidova Z.S., Protodyakonova T.L., Buryanov A.F., Nikitina S.V. - Structure modification and properties of gypsum binder dispersion of technical soot / Intelligent systems in production. 2019.Vol. 17.
E.M.M. - Fine-grained concrete modified with a suspension of chrysotile nanofibers / Building materials. 2019.No 1-2.
Determination of electrical conductivity of samples using E7-20 meter RLC Results and Discussion It was noted that the fluorohydrite matrix had a large number of micropores, filled with pore solution containing sodium cations.
Repin - Modification of the structure and properties of fine-grained concrete with carbon black dispersion/ [8] Yakovlev G.I., Pervushin G.N., Gordina A.F., Shaibadulina A.V., Saidova Z.S., Protodyakonova T.L., Buryanov A.F., Nikitina S.V. - Structure modification and properties of gypsum binder dispersion of technical soot / Intelligent systems in production. 2019.Vol. 17.
E.M.M. - Fine-grained concrete modified with a suspension of chrysotile nanofibers / Building materials. 2019.No 1-2.
Online since: August 2019
Authors: Jana Boháčová, Lukáš Prochazka, Michal Pešata
Slag-forming additives (limestone, dolomitic limestone and dolomite) are used to facilitate the formation of slag, which are added to the blast furnaces. [2, 3]
The basic chemicals forming blast furnace slag are lime oxide (35-40%), silica (approximately 40%) and alumina (about 10%), magnesium oxide (about 10%) is also included and a number of trace compounds and elements.
The resulting Los Angeles coefficient is in Table 1, which also contains details of the weights before and after the test. [8] Table 1 Determination of the Los Angeles factor Fraction of aggregate [mm] Input weight [g] Weight after LA test [g] Residue on sieve 1,6mm [g] Number of steel balls [-] Weight of steel balls [g] Coefficient LA [-] 8 - 16 5002.6 4928.4 4139.9 10 4311.6 17.2 4 - 8 5001.3 4936.7 4048.1 8 3527.4 19.0 The producer has determined LA crushing resistance only for a fraction of 10 - 14 mm and declares it in technical sheets for all other fractions.
Table 4 Basic physical and mechanical properties of aggregate Fraction of aggregate [mm] Bulk density of aggregate [kg.m-3] Free flow bulk density [kg.m-3] Tapped bulk density [kg.m-3] Aggregate spacing - free flow [%] Aggregate spacing - tapped [%] 8-16 2510 1180 1370 53.0 45.4 4-8 2500 1170 1380 53.2 44.8 0-4 2500 1430 1620 42.8 35.2 Table 5 Porosity of slag aggregate Fraction of aggregate [mm] Density [Mg.m-3] Bulk density of aggregate [Mg.m-3] Porosity [%] 8-16 2.99 2.51 16.1 4-8 2.99 2.50 16.4 0-4 2.99 2.50 16.4 Table 6 Shape index of slag aggregate Fraction of aggregate [mm] Test sample weight [g] Cubic grains [g] Non-cubic grains [g] Shape index 8-16 1330.3 1287.2 43.1 3 4-8 121 116.2 4.8 4 0-4 Table 7 Granulometry of slag aggregate Fraction 0-4 4-8 8-16 Sieve[mm] Percentage passing [%] Percentage passing [%] Percentage passing [%] 31.5 100.0 100.0 100.0 16 100.0 100.0 99.5 8 99.9 86.4 0.6 4 91.6 1.9 0.3 2 51.8 0.1 0.3 1
The resulting Los Angeles coefficient is in Table 1, which also contains details of the weights before and after the test. [8] Table 1 Determination of the Los Angeles factor Fraction of aggregate [mm] Input weight [g] Weight after LA test [g] Residue on sieve 1,6mm [g] Number of steel balls [-] Weight of steel balls [g] Coefficient LA [-] 8 - 16 5002.6 4928.4 4139.9 10 4311.6 17.2 4 - 8 5001.3 4936.7 4048.1 8 3527.4 19.0 The producer has determined LA crushing resistance only for a fraction of 10 - 14 mm and declares it in technical sheets for all other fractions.
Table 4 Basic physical and mechanical properties of aggregate Fraction of aggregate [mm] Bulk density of aggregate [kg.m-3] Free flow bulk density [kg.m-3] Tapped bulk density [kg.m-3] Aggregate spacing - free flow [%] Aggregate spacing - tapped [%] 8-16 2510 1180 1370 53.0 45.4 4-8 2500 1170 1380 53.2 44.8 0-4 2500 1430 1620 42.8 35.2 Table 5 Porosity of slag aggregate Fraction of aggregate [mm] Density [Mg.m-3] Bulk density of aggregate [Mg.m-3] Porosity [%] 8-16 2.99 2.51 16.1 4-8 2.99 2.50 16.4 0-4 2.99 2.50 16.4 Table 6 Shape index of slag aggregate Fraction of aggregate [mm] Test sample weight [g] Cubic grains [g] Non-cubic grains [g] Shape index 8-16 1330.3 1287.2 43.1 3 4-8 121 116.2 4.8 4 0-4 Table 7 Granulometry of slag aggregate Fraction 0-4 4-8 8-16 Sieve[mm] Percentage passing [%] Percentage passing [%] Percentage passing [%] 31.5 100.0 100.0 100.0 16 100.0 100.0 99.5 8 99.9 86.4 0.6 4 91.6 1.9 0.3 2 51.8 0.1 0.3 1
Online since: February 2012
Authors: A. Erman Tekkaya, Bernd-Arno Behrens, Annika Foydl, Insa Pfeiffer, Andreas Jäger, Matthias Kammler, Thorsten Matthias, Daniel Pietzka
They feature a high mechanical and dynamical strength due to a process-related grain refinement as well as an unbroken and shape-adapted grain flow.
The elements consist of different materials and feature different surfaces and the number of elements inside one billet varies depending on the length of the elements, see Tab. 1.
Acknowledgments This work is based on investigations of the research project “Component Optimization by Forging of Composite Aluminum Extrusions” (DFG, Project number TE 508/17-1, BE 1691/102-1) in collaboration with the subproject A2 “Composite extrusion” of the SFB/TRR 10, funded by the German Research Foundation.
The elements consist of different materials and feature different surfaces and the number of elements inside one billet varies depending on the length of the elements, see Tab. 1.
Acknowledgments This work is based on investigations of the research project “Component Optimization by Forging of Composite Aluminum Extrusions” (DFG, Project number TE 508/17-1, BE 1691/102-1) in collaboration with the subproject A2 “Composite extrusion” of the SFB/TRR 10, funded by the German Research Foundation.
Online since: September 2014
Authors: Camilla Colla
The test method determines a rebound number of hardened concrete using a spring-driven steel hammer.
Two replicate cores shall be taken from at least six locations with different rebound numbers.
Tables relating the rebound number with mortar strength, indicate that low rebound number (equal to 15) can be related to a mortar strength as low as 1.4 MPa (a high rebound number of 34 corresponding to 25 MPa): this low limit is sometimes still too high for historic mortar strength values.
At the same time, the hole diameter has to be sufficiently large compared to the maximum sand grain size.
Vaults numbering starts from cathedral apses.
Two replicate cores shall be taken from at least six locations with different rebound numbers.
Tables relating the rebound number with mortar strength, indicate that low rebound number (equal to 15) can be related to a mortar strength as low as 1.4 MPa (a high rebound number of 34 corresponding to 25 MPa): this low limit is sometimes still too high for historic mortar strength values.
At the same time, the hole diameter has to be sufficiently large compared to the maximum sand grain size.
Vaults numbering starts from cathedral apses.
Online since: March 2008
Authors: Werner Riehemann, Agnieszka Mielczarek, Marcin Marczyk
For selected cycle numbers and heat treatment times the amplitude dependence
of damping was measured at room temperature.
In the Ramsdel notations [5] the numbers denote the number of the basal plane layers (planes distorted from austenite {110} type plane) in one period.
Fe was added for grain refinement.
Amplitude dependence of damping of the alloy A after different numbers of thermal cycles N.
Amplitude dependence of damping of the alloy MP1 after different numbers of thermal cycles N.
In the Ramsdel notations [5] the numbers denote the number of the basal plane layers (planes distorted from austenite {110} type plane) in one period.
Fe was added for grain refinement.
Amplitude dependence of damping of the alloy A after different numbers of thermal cycles N.
Amplitude dependence of damping of the alloy MP1 after different numbers of thermal cycles N.
Online since: June 2015
Authors: Sergey Panin, Iaroslav Lytvynenko, Pavlo Maruschak, Sergiy Lupenko
In a number of works, the presence of the mesoscopic level of deformation was theoretically grounded and experimentally proved, which allows considering the materials subjected to deformation as the self-organized systems [1-5].
In a number of works, the notions of self-organized relief formations, deformation of surface layers and internal boundaries between polycrystals are used, which play an important role in the nucleation of deformation defects.
, , , (4) where is the value of statistics in the discrete th moment of time; is the number of countdowns for the registered realization of the signal; is the value of the discretized realization of the signal at the th moment of time.
Within the context of the proposed mathematical model of the surface covered with deformation relief, we interpret a number of its main elements, such as the cycle, phase and rhythm of the relief formation process.
Mishnaevsky Jr, Non-equilibrium grain boundaries in titanium nanostructured by severe plastic deformation: Computational study of sources of material strengthening, Comput.
In a number of works, the notions of self-organized relief formations, deformation of surface layers and internal boundaries between polycrystals are used, which play an important role in the nucleation of deformation defects.
, , , (4) where is the value of statistics in the discrete th moment of time; is the number of countdowns for the registered realization of the signal; is the value of the discretized realization of the signal at the th moment of time.
Within the context of the proposed mathematical model of the surface covered with deformation relief, we interpret a number of its main elements, such as the cycle, phase and rhythm of the relief formation process.
Mishnaevsky Jr, Non-equilibrium grain boundaries in titanium nanostructured by severe plastic deformation: Computational study of sources of material strengthening, Comput.
Online since: July 2011
Authors: Quan Shui Chen, Ju Gong Zheng, Guang Yuan Ren
Schematic diagram of sensors placement of third layer block is shown in Fig.1(b), the number on line is the size from sensors to the heating tube, which is expressed by “d”, there are four sensors respectively at d=20mm, 45mm, 70mm, 95mm in the third layer block.
Nature Na-bentonite samples from inner Mongolia Gaomiaozi in China are milled and screened, grain size 200 mesh, drying temperature(105±3)˚C until constant weight.
Gradually, the temperature value set on the control is increased with the experiment operation until the temperature of the number 8 sensor achieve to the required value.
At the first stage, the temperature of the number 8 sensor in the third layer bentonite block reach to about 55˚C, the distance of the number 8 sensor is 20mm to the heating source; When the temperature come to equilibrium after a very long time, heating gradually again, finally, the temperature of the number 8 sensor increase to about 82˚C.
Change trend of four curves can be seen in Fig.2, the temperature of the blocks increase quickly at the beginning, after about 20 hours, the temperature of the number 8 sensor with d=20mm reach the maximum 55˚C or so, from then on the temperature slightly decrease, the time is about 40 hours, it change to be steady; at the second stage, the temperature of number 8 sensor rise to about 82˚C, coming to balance.
Nature Na-bentonite samples from inner Mongolia Gaomiaozi in China are milled and screened, grain size 200 mesh, drying temperature(105±3)˚C until constant weight.
Gradually, the temperature value set on the control is increased with the experiment operation until the temperature of the number 8 sensor achieve to the required value.
At the first stage, the temperature of the number 8 sensor in the third layer bentonite block reach to about 55˚C, the distance of the number 8 sensor is 20mm to the heating source; When the temperature come to equilibrium after a very long time, heating gradually again, finally, the temperature of the number 8 sensor increase to about 82˚C.
Change trend of four curves can be seen in Fig.2, the temperature of the blocks increase quickly at the beginning, after about 20 hours, the temperature of the number 8 sensor with d=20mm reach the maximum 55˚C or so, from then on the temperature slightly decrease, the time is about 40 hours, it change to be steady; at the second stage, the temperature of number 8 sensor rise to about 82˚C, coming to balance.
Online since: March 2009
Authors: De Hai Ping, Li Ming Yu, Fu Xing Yin, Satoshi Iwasaki
Such internal
friction mechanism has not been applied in the development of high damping alloy while grain
boundary and twin boundary featured anelastic relaxations are applied in some high damping alloys.
The octahedral cells surrounding interstitial oxygen atom were classified into 6 kinds with number of Ti atoms.
Ferromagnetic and dislocation featured high damping alloys belong to the latter while the grain or twin boundary featured high damping alloys are characteristic of anelastic relaxation mechanism.
The octahedral cells surrounding interstitial oxygen atom were classified into 6 kinds with number of Ti atoms.
Ferromagnetic and dislocation featured high damping alloys belong to the latter while the grain or twin boundary featured high damping alloys are characteristic of anelastic relaxation mechanism.
Online since: May 2013
Authors: James Wang, Noppakun Sanpo, Christopher C. Berndt
Survival % = Colony number of treated bacteria Colony number of control bacteria× 100 (1)
For the modified Kirby-Bauer method [17] , an equal amount of copper-substituted cobalt ferrite nanoparticles obtained from CA were coated on filter papers.
SEM micrographs were used to examine the microstructure of the nanoparticles, which would provide a better view of the grain development and grain sizes.
The average grain sizes measured by ImageJ for Co(1-x)CuxFe2O4 with x = 0, 0.3, 0.5, 0.7, and 1 are 41.52, 41.05, 40.07, 38.97, and 37.54 nm, respectively.
Moreover, there is a noticeable decrease in intensity of the 695 cm-1 tetrahedral Raman band and all the peaks are shifted towards the lower wave number side due to a higher atomic mass of Cu compared to the Co ion.
SEM micrographs were used to examine the microstructure of the nanoparticles, which would provide a better view of the grain development and grain sizes.
The average grain sizes measured by ImageJ for Co(1-x)CuxFe2O4 with x = 0, 0.3, 0.5, 0.7, and 1 are 41.52, 41.05, 40.07, 38.97, and 37.54 nm, respectively.
Moreover, there is a noticeable decrease in intensity of the 695 cm-1 tetrahedral Raman band and all the peaks are shifted towards the lower wave number side due to a higher atomic mass of Cu compared to the Co ion.