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Online since: May 2021
Authors: Mahdi S. Edan, Faras Q. Mohammed, Adawiya J. Haider, Ali S. Hasan
Chemical composition and crystallinity along with the average grain size for BN phases was investigated by using XRD test and FTIR spectrum.
Also the stainless steel surface is composed of micro meter sized grains.
The common size of grains for the made BN phases within the coating was measured by using the Scherer chemical procedure. [17] The common grain size for BN section was calculable to be ~18nm with deposition temperature of 650OC, ~23nm with deposition temperature of 750OC.
While, E, N and Vr are the all out electron vitality, a number of electrons, and outside potential, separately.
XRD patterns and Scherer chemical formula evident the crystal formation phases associated with increasing substrate temperature. the typical grain size for BN part was calculable to be ~18nm with deposition temperature of 650oC, ~23nm with deposition temperature of 750oC, and larger grain size of particle for 850-950oC of 42−37 nm, which was driven by the higher imposed forming energy that denote bigger grains with long range order.
Also the stainless steel surface is composed of micro meter sized grains.
The common size of grains for the made BN phases within the coating was measured by using the Scherer chemical procedure. [17] The common grain size for BN section was calculable to be ~18nm with deposition temperature of 650OC, ~23nm with deposition temperature of 750OC.
While, E, N and Vr are the all out electron vitality, a number of electrons, and outside potential, separately.
XRD patterns and Scherer chemical formula evident the crystal formation phases associated with increasing substrate temperature. the typical grain size for BN part was calculable to be ~18nm with deposition temperature of 650oC, ~23nm with deposition temperature of 750oC, and larger grain size of particle for 850-950oC of 42−37 nm, which was driven by the higher imposed forming energy that denote bigger grains with long range order.
Online since: November 2005
Authors: Seok Hwan Ahn, Ki Woo Nam, So Soon Park, Chang Kwon Moon
The grain size of 40 areas was measured
respectively in each metal parts and the representative value of the 40 areas was assumed as the
grain size of each metal part.
In the case of BM, BM (LT) has the longer fatigue life than BM (TL) because the grain of BM is lengthened along the direction of TL.
So, the fatigue crack of BM (LT) should penetrate through the grain while the fatigue crack of BM (TL) propagates easily along the lengthened grain boundary [5-7].
This is caused by the grain distribution.
The bigger grain and the lager anisotropy of grain direction, the more decrease of V (L). 5560 5580 5600 5620 5640 5660 5680 5700 5720 5740 5760 5780 V(L) V(T) Velocity (m/sec) 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 α(L) α(T) f(L) WM HAZ BM attenuation factor X 10 (dB/mm) Frequency (MHz) 25 30 35 40 45 50 55 60 65 5500 5600 5700 Frequency of BM(L), f(L) (MHz) Attenuation factor x 10 of BM(L), α(L) (db/mm) Velocity of BM(L), V(L) (m/sec) BM(T) grain size and V(L) Grain size of BM(T), d(T) (µµµµm) 2.0 2.5 3.0 3.5 4.0 4.5 5.0 a (L) = 1.35649 + 0.02035*d(T) V(L) = 5914.96589 - 5.89548*d(T) f(L) = 5.56599 - 0.02719*d(T) BM(T) grain size and f(L) BM(T) grain size and α(L) Fig. 9 Velocity and attenuation factor of BM, HAZ and WM before deterioration (CT4) Fig. 10 Relationships among grain size, d (T) of BM (T) and V (L), α (L) and f (L) 0 10 20 30 40 50 60 70 0 2 4 6 8 10 0 2 4 6 8 10 f(L) = 5.0728
In the case of BM, BM (LT) has the longer fatigue life than BM (TL) because the grain of BM is lengthened along the direction of TL.
So, the fatigue crack of BM (LT) should penetrate through the grain while the fatigue crack of BM (TL) propagates easily along the lengthened grain boundary [5-7].
This is caused by the grain distribution.
The bigger grain and the lager anisotropy of grain direction, the more decrease of V (L). 5560 5580 5600 5620 5640 5660 5680 5700 5720 5740 5760 5780 V(L) V(T) Velocity (m/sec) 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 α(L) α(T) f(L) WM HAZ BM attenuation factor X 10 (dB/mm) Frequency (MHz) 25 30 35 40 45 50 55 60 65 5500 5600 5700 Frequency of BM(L), f(L) (MHz) Attenuation factor x 10 of BM(L), α(L) (db/mm) Velocity of BM(L), V(L) (m/sec) BM(T) grain size and V(L) Grain size of BM(T), d(T) (µµµµm) 2.0 2.5 3.0 3.5 4.0 4.5 5.0 a (L) = 1.35649 + 0.02035*d(T) V(L) = 5914.96589 - 5.89548*d(T) f(L) = 5.56599 - 0.02719*d(T) BM(T) grain size and f(L) BM(T) grain size and α(L) Fig. 9 Velocity and attenuation factor of BM, HAZ and WM before deterioration (CT4) Fig. 10 Relationships among grain size, d (T) of BM (T) and V (L), α (L) and f (L) 0 10 20 30 40 50 60 70 0 2 4 6 8 10 0 2 4 6 8 10 f(L) = 5.0728
Online since: June 2019
Authors: Ying Yan Hu, Jun Feng Wang, Can Li, Jian Qiang Li
In addition, the grain boundaries provide nucleation sites for the IMCs, resulting in their enrichment around the grain boundary areas of the solidification in Fig. 4(b).
The grain boundary size of particle diameter with large cooling rate is larger, while the grain boundary size of particles with small cooling rate is smaller.
Moreover, the fine IMCs size was more and more obvious and the number is increased as seen in Fig. 6(b), Fig. 6(d) and Fig. 6(f), respectively.
In addition, the grain boundaries provide nucleation sites for the IMCs, resulting in their enrichment around the grain boundary areas in the rapid solidification of Sn-1.0Ag-0.5Cu particles.
The grain boundary size of particle with larger cooling rate is smaller, while the solidification grain boundary of particles with smaller cooling rate is larger during the rapid solidification.
The grain boundary size of particle diameter with large cooling rate is larger, while the grain boundary size of particles with small cooling rate is smaller.
Moreover, the fine IMCs size was more and more obvious and the number is increased as seen in Fig. 6(b), Fig. 6(d) and Fig. 6(f), respectively.
In addition, the grain boundaries provide nucleation sites for the IMCs, resulting in their enrichment around the grain boundary areas in the rapid solidification of Sn-1.0Ag-0.5Cu particles.
The grain boundary size of particle with larger cooling rate is smaller, while the solidification grain boundary of particles with smaller cooling rate is larger during the rapid solidification.
Online since: January 2013
Authors: Kui Gong, Xiao Yun Sun, Xin Hai Wang, Ming Xia, Fei Ren, Peng Lai Guan, Shi Gang Xin
Coarse grains including cereals, corn, millet, purple rice, sorghum, oats, buckwheat, wheat bran and so on, contain mainly carbohydrates and more dietary fiber and B vitamins than refined grains[1-5].
Healthy diets with suitable coarse grains make the various nutrients complement each others.
The standard sample was added according to the results obtained in the table 3 and 4 (standard sample size number must be similar to the measured values, otherwise the conclusion of the recovery rate is not accurate).
By the determination of various coarse grains, it is found that useful elements Mg, Ca, Mn, Fe, As, Sn, Se, P, etc. in the coarse grains are very rich, the contents of harmful elements Se and As were very low.
So coarse grains such as corn, sorghum and milleare are benefit for our healthy.
Healthy diets with suitable coarse grains make the various nutrients complement each others.
The standard sample was added according to the results obtained in the table 3 and 4 (standard sample size number must be similar to the measured values, otherwise the conclusion of the recovery rate is not accurate).
By the determination of various coarse grains, it is found that useful elements Mg, Ca, Mn, Fe, As, Sn, Se, P, etc. in the coarse grains are very rich, the contents of harmful elements Se and As were very low.
So coarse grains such as corn, sorghum and milleare are benefit for our healthy.
Online since: March 2015
Authors: Jia Jie Wang, Zhi Bo Tong, Qi Chun Peng
While from 1000˚C to 1100˚C, the dimple becomes smaller and the number decreased compared with 1000˚C, namely the plasticity deteriorated which is consistent with the thermoplastic curve trend showed in Fig.4.
The grain is obviously thicker and grain boundaries also become more clear from 800˚C to 950˚C which is in the Ⅲ brittle zone.
The brittleness of this zone is usually caused by oxides, sulfides, nitrides precipitation and proeutectoid ferrite film precipitation in grain boundary of austenite, grain boundary sliding and other reasons[3].
At 800˚C as reticular ferrite precipitated at austenite grain boundaries lead to a serious decline of the steel toughness and reaches its lowest value.
Sample ontology is composed of solid steel skeleton and partial melt of grain boundary, but rarely melt.
The grain is obviously thicker and grain boundaries also become more clear from 800˚C to 950˚C which is in the Ⅲ brittle zone.
The brittleness of this zone is usually caused by oxides, sulfides, nitrides precipitation and proeutectoid ferrite film precipitation in grain boundary of austenite, grain boundary sliding and other reasons[3].
At 800˚C as reticular ferrite precipitated at austenite grain boundaries lead to a serious decline of the steel toughness and reaches its lowest value.
Sample ontology is composed of solid steel skeleton and partial melt of grain boundary, but rarely melt.
Online since: October 2012
Authors: Gonasagren Govender, Lilian Ivanchev, Sigqibo Templeton Camagu
The micron size particles were found to be predominantly in the intergranular eutectic while the nano-particles were predominantly in the primary α-Al grains.
There are a large number of possible MMC combinations that can be fabricated owing to the number of matrices and reinforcements that are available.
This is due to the tendency of the “larger” particles to occupy the grain boundaries [7].
CSIR’s Processing and Alloying research group seeks to cast aluminium alloys reinforced with SiC micro, micro plus nano hybrid as well as nano particles not only dispersed uniformly in the Al-Si eutectic but in the α aluminium grains as well.
Micro-hardness of the eutectic and primary α grains was assessed using a Futuretech micro-Vickers hardness tester and tensile tests were done using an INSTRON 1342/H1314 tensile servo-hydraulic testing machine. 3.
There are a large number of possible MMC combinations that can be fabricated owing to the number of matrices and reinforcements that are available.
This is due to the tendency of the “larger” particles to occupy the grain boundaries [7].
CSIR’s Processing and Alloying research group seeks to cast aluminium alloys reinforced with SiC micro, micro plus nano hybrid as well as nano particles not only dispersed uniformly in the Al-Si eutectic but in the α aluminium grains as well.
Micro-hardness of the eutectic and primary α grains was assessed using a Futuretech micro-Vickers hardness tester and tensile tests were done using an INSTRON 1342/H1314 tensile servo-hydraulic testing machine. 3.
Online since: February 2013
Authors: Jian Ting Guo, Li Yuan Sheng, Chao Yuan, G.S. Li, F. Yang, T.F. Xi
Recently, Morsi [19] reviewed a number of novel processes applied to the reaction synthesis of Ni-Al intermetallics.
The difference between Ni3Al and Ni3Al-B-Cr is that there are some γ-Ni phases along the Ni3Al grain boundary and the grain size of Ni3Al alloy is bigger than that of Ni3Al-B-Cr alloy.
But there are still some Al2O3 particles agglomerated along grain boundary.
More observations found that except the fine grains exhibited in the OM micrograph, finer Ni3Al grains exist in the alloy, as shown in Fig.3 (a).
The Ni3Al grains are elongated along the extrusion direction.
The difference between Ni3Al and Ni3Al-B-Cr is that there are some γ-Ni phases along the Ni3Al grain boundary and the grain size of Ni3Al alloy is bigger than that of Ni3Al-B-Cr alloy.
But there are still some Al2O3 particles agglomerated along grain boundary.
More observations found that except the fine grains exhibited in the OM micrograph, finer Ni3Al grains exist in the alloy, as shown in Fig.3 (a).
The Ni3Al grains are elongated along the extrusion direction.
Online since: May 2019
Authors: Yuri Mikhailovich Kolitievsky, Victor Vasilievich Nikonov, Nikolay Nikolaevich Sirotin, Vladimir Vladimirovich Yudaev, Sergey Victorovich Daletsky
As fine-grained fillers and sand-filler screenings of crushing of limestone, marble, granite scattered on fractions of 0,16-0,63 mm, 0,63-2,5 mm or 0,63-5 mm respectively were used.
Larger fractions selected on sieves were used as fine-grained sand and aggregate sand.
They contain a number of particles, usually 20-40% of the upper nanometric level, with dimensions of 200-400 nanometers.
The final process, preserving for a number of years the decorative properties of the surfaces, is hydrophobic treatment.
Powder-activated fine-grained dry concrete mixtures for the production of various concretes / V.
Larger fractions selected on sieves were used as fine-grained sand and aggregate sand.
They contain a number of particles, usually 20-40% of the upper nanometric level, with dimensions of 200-400 nanometers.
The final process, preserving for a number of years the decorative properties of the surfaces, is hydrophobic treatment.
Powder-activated fine-grained dry concrete mixtures for the production of various concretes / V.
Online since: October 2006
Authors: Zhan Feng Tian, Jun Xu, Zhi Feng Zhang, Li Kai Shi
Rosette and degenerate dendritic grains obviously reduce at the
same time.
In the conventional casing processes, Heterogeneous nucleation takes place from the mould wall, and then columnar grains increase progressively as solidification proceeds, since those grains which have a preferred growth direction oriented near the heat flow direction tend to "crowd out " less favorably oriented grains[6].
Interface of the near-globular polyhedron grain is termed "coarse interface".
This solidification condition is favor for the improvement of interface stableness of grains.
This solidification condition is favor for the improvement of interface stableness of grains.
In the conventional casing processes, Heterogeneous nucleation takes place from the mould wall, and then columnar grains increase progressively as solidification proceeds, since those grains which have a preferred growth direction oriented near the heat flow direction tend to "crowd out " less favorably oriented grains[6].
Interface of the near-globular polyhedron grain is termed "coarse interface".
This solidification condition is favor for the improvement of interface stableness of grains.
This solidification condition is favor for the improvement of interface stableness of grains.
Online since: May 2010
Authors: Philip J. Withers, Tamás Ungár, Thomas. H. Simm, J. Fonseca
It is
assumed that the defect microstructure can be modelled using a small number of parameters.
One of the approximations made is that deformation is homogenous and all grains have the same random dislocation population.
All samples were heat treated to produce annealed grains of approximately 30µm with an almost random texture.
This allowed many grains to be measured at a high resolution (d/d~4X10 -4).
The Taylor model [6] is used to calculate the slip activity of different slip systems for different grains.
One of the approximations made is that deformation is homogenous and all grains have the same random dislocation population.
All samples were heat treated to produce annealed grains of approximately 30µm with an almost random texture.
This allowed many grains to be measured at a high resolution (d/d~4X10 -4).
The Taylor model [6] is used to calculate the slip activity of different slip systems for different grains.