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Hot Deformation Behavior of Multi-Size Al2O3 Particles Dispersion Strengthened Copper Base Composite
Online since: July 2013
Authors: Bao Hong Tian, Yong Liu, Yi Zhang, Xue Rui Yang
Introduction
It is well known that Cu-Al2O3 composites have excellent comprehensive properties, such as high recrystallization temperature and high microstructure stability, high yield strength and tensile strength, high softening and creep resistance to elevated temperature and high electrical and thermal conductivities etc.
In Fig. 1 the mechanical adding micron-sized Al2O3 particles distribute inhomogeneously in the Al2O3/Cu composite matrix in dark angular shape.
The materials activation energy can reflect a degree of difficulty of the atomic arrangement, which was affected by the metal material nature, deformation temperature, and strain rate factors etc.
In Fig. 1 the mechanical adding micron-sized Al2O3 particles distribute inhomogeneously in the Al2O3/Cu composite matrix in dark angular shape.
The materials activation energy can reflect a degree of difficulty of the atomic arrangement, which was affected by the metal material nature, deformation temperature, and strain rate factors etc.
Online since: December 2012
Authors: Cui Xin Chen, Hui Fen Peng, Pu Zhao, Yuan Yuan Li, Liang Yan
Aimed at improving mechanical properties of high strength low alloy steel welds, oxides with high melting point and high stability were added into steel liquid.
The presence of inclusions may degrade some of the material properties for high strength low alloy steel welds.
However, an innovative concept has arisen recently in which non-metallic inclusions can be utilized to enhance the properties of steel products.
So, large attention has been paid on the effect of inclusion on welds mechanical performance.
A great quantity of fine and interlocked acicular ferrite can be obtained in weld metal which make the harmful inclusion become a favorable factor to improve microstructure and propertied of steel weld.
The presence of inclusions may degrade some of the material properties for high strength low alloy steel welds.
However, an innovative concept has arisen recently in which non-metallic inclusions can be utilized to enhance the properties of steel products.
So, large attention has been paid on the effect of inclusion on welds mechanical performance.
A great quantity of fine and interlocked acicular ferrite can be obtained in weld metal which make the harmful inclusion become a favorable factor to improve microstructure and propertied of steel weld.
Online since: August 2013
Authors: Song Wei Jia
SOC storage in the agriculture not only was affected by some natural factors, but also related with the tillage measures, such as the tillage, crop rotation, fertilization, etc.
Effect of Conventional Tillage Measures on Soil Physical Properties.
Conservation tillage is designed to reduce erosion and maintain or improve soil health properties.
Effects of tillage on soil physical properties.
Influence of no-tillage and nitrogen fertilization on certain soil properties after 5 years of continuous corn.
Effect of Conventional Tillage Measures on Soil Physical Properties.
Conservation tillage is designed to reduce erosion and maintain or improve soil health properties.
Effects of tillage on soil physical properties.
Influence of no-tillage and nitrogen fertilization on certain soil properties after 5 years of continuous corn.
Online since: May 2011
Authors: Xin Xin Ma, Guang Ze Tang, Yu Jiang Wang, Qing Fu Chen
And the morphologies of the initial aluminum films were found to be critical factors for successfully anodizing the Al film on 316L SS surface.
However, the polymer coating is subjected to mechanical damaged at the time of stent implantation [2].
Recently, porous DES, which was defined as endovascular stents with a surface or internal porosity that functioned as a reservoir for a continuous release of antirestenotic agents [5], has attracted wide attention due to its promising application potential in offering desirable drug elution properties as well as favorable clinical outcomes [6,7].
But up to now, there only a few technologies used to create porous stents, such as coating the stents with nanoporous aluminum oxide film [8] or manufacturing the stent surface or body itself by mechanical surface modification [9,10], and laser-cut manufacturing[6].
A further increase in the current density, as shown in Fig. 1c and d, seems fail to affect the morphology of the aluminum layer so much as in the case of lower current densities.
However, the polymer coating is subjected to mechanical damaged at the time of stent implantation [2].
Recently, porous DES, which was defined as endovascular stents with a surface or internal porosity that functioned as a reservoir for a continuous release of antirestenotic agents [5], has attracted wide attention due to its promising application potential in offering desirable drug elution properties as well as favorable clinical outcomes [6,7].
But up to now, there only a few technologies used to create porous stents, such as coating the stents with nanoporous aluminum oxide film [8] or manufacturing the stent surface or body itself by mechanical surface modification [9,10], and laser-cut manufacturing[6].
A further increase in the current density, as shown in Fig. 1c and d, seems fail to affect the morphology of the aluminum layer so much as in the case of lower current densities.
Online since: January 2011
Authors: Mehdi Bayat, Aidy Ali, Amirreza Fahim Golestaneh
Department of Mechanical Engineering, Faculty of Engineering,
University of Malaya, 50603 Kuala Lumpur, Malaysia.
Introduction Friction stir welded joint (FSW) includes five different zones, shown in Fig. 1 (a) as: (1) nugget zone (NZ), (2) flow arm zone (FAZ), (3) thermomechanically affected zone (TMAZ), (4) heat affected zone (HAZ) and (5) parent plate zone (PZ).
Material property of FSW zones in 2024-T351 Al Alloy.
In fact the crack behavior is intensely affected by the variation of hardness and residual stress along the zones in addition to the microstructure.
On the other hand residual stress as a significant factor in crack behavior increased the growth rate from NZ to TMAZ where it fell from 200 MPa compression to 60 MPa compression.
Introduction Friction stir welded joint (FSW) includes five different zones, shown in Fig. 1 (a) as: (1) nugget zone (NZ), (2) flow arm zone (FAZ), (3) thermomechanically affected zone (TMAZ), (4) heat affected zone (HAZ) and (5) parent plate zone (PZ).
Material property of FSW zones in 2024-T351 Al Alloy.
In fact the crack behavior is intensely affected by the variation of hardness and residual stress along the zones in addition to the microstructure.
On the other hand residual stress as a significant factor in crack behavior increased the growth rate from NZ to TMAZ where it fell from 200 MPa compression to 60 MPa compression.
Online since: September 2008
Authors: Alina Agüero, Raúl Muelas, Marcos Gutiérrez, Krystina Spiradek, S. Höfinger
Nevertheless it has been shown that these cracks
do not propagate into the substrate on exposure to steam at 650º C [5] and that the coating does not
affect significantly the creep and the thermo-mechanical fatigue behavior of the substrate [15].
This estimation does not take into account possible failures caused by other factors such as spalling due to Kirkendall porosity.
It has also been shown that differences in substrate composition affect the coating morphology and may affect the coating degradation mechanism as well as its durability [14].
Therefore, the amount of N dissolved in the ferritic steel for strengthening purposes decreases and therefore may be expected to affect the mechanical properties of the alloy.
None of these effects seem to affect the coatings resistance to steam oxidation after more than 45,000 h of laboratory testing at 650º C [16].
This estimation does not take into account possible failures caused by other factors such as spalling due to Kirkendall porosity.
It has also been shown that differences in substrate composition affect the coating morphology and may affect the coating degradation mechanism as well as its durability [14].
Therefore, the amount of N dissolved in the ferritic steel for strengthening purposes decreases and therefore may be expected to affect the mechanical properties of the alloy.
None of these effects seem to affect the coatings resistance to steam oxidation after more than 45,000 h of laboratory testing at 650º C [16].
Online since: August 2016
Authors: Qolby Sabrina, Christin Rina Ratri
PVdF was chosen as polymer matrix in this research due to its advantages compared to the other polymers such as higher dipole moment and dielectric constant, which are important factor in lithium salt ionization.
In addition, PVdF is also superior in the electrolyte-electrode interaction, and the existence of -C-F- bond has strong properties in attracting electron. [5] Lithium hexafluorophosphate (LiPF6) is one of electrolyte salts that is widely used in commercial lithium-ion battery.
Particle agglomeration affecting the amount of pore formation can be seen in Fig. 2(c).
However, this might be undesirable because the mechanical strength of the solid polymer electrolyte system would be compromised.
Cheng, Comparison of the electrochemical properties of LiBOB and LiPF6 in electrolytes for LiMn2O4/Li cells, J.
In addition, PVdF is also superior in the electrolyte-electrode interaction, and the existence of -C-F- bond has strong properties in attracting electron. [5] Lithium hexafluorophosphate (LiPF6) is one of electrolyte salts that is widely used in commercial lithium-ion battery.
Particle agglomeration affecting the amount of pore formation can be seen in Fig. 2(c).
However, this might be undesirable because the mechanical strength of the solid polymer electrolyte system would be compromised.
Cheng, Comparison of the electrochemical properties of LiBOB and LiPF6 in electrolytes for LiMn2O4/Li cells, J.
Online since: November 2015
Authors: Roland Platz, Tobias Melz, Benedict Götz, Maximilian Schaeffner
The beam properties
are radius rb, bending stiffness EIb and density ρb, they are assumed to be constant across the entire
beam length lb.
The model parameters describing the properties of the beam and the supports presented in Figures 1 and 3 are summarized in Table 1.
Now, the lateral dynamic behavior is validated and then updated by adjustments of the beam's elastic support properties.
An adjustment of the beam's elastic properties, mass and bending stiffness, has also been conducted but is not included in this paper.
However, it does not significantly affect the maximum bearable axial load for the active stabilization.
The model parameters describing the properties of the beam and the supports presented in Figures 1 and 3 are summarized in Table 1.
Now, the lateral dynamic behavior is validated and then updated by adjustments of the beam's elastic support properties.
An adjustment of the beam's elastic properties, mass and bending stiffness, has also been conducted but is not included in this paper.
However, it does not significantly affect the maximum bearable axial load for the active stabilization.
Online since: May 2023
Authors: Mustafa Chouireb, Oulad Naoui Noureddine, Abdelkader Djehiche, Gafsi Mostefa
Soil seepage, which is the hydraulic conductivity of the soil and the pressure gradient, can be affected by a combination of factors that affect water seepage in both homogenous and non-homogeneous earth dams.
Artificial Neural Networks ANN is one of the artificial intelligence related technologies which have many properties such investigating seepage in the dam’s body.
It is easily seen that seepage increase is regularly related to the dam height (H) if all the other affecting parameters are constant.
It can be seen that Rk is the more affecting geometrical variable on leakage flow with 66.9 % while the tanθ ranked in the second position with 12.6%.
The results interpretation confirmed that Rk is the most important factor affecting the leakage flow, with a significant percentage of 66.9% compared to a low percentage of 12.6% of the upstream slope.
Artificial Neural Networks ANN is one of the artificial intelligence related technologies which have many properties such investigating seepage in the dam’s body.
It is easily seen that seepage increase is regularly related to the dam height (H) if all the other affecting parameters are constant.
It can be seen that Rk is the more affecting geometrical variable on leakage flow with 66.9 % while the tanθ ranked in the second position with 12.6%.
The results interpretation confirmed that Rk is the most important factor affecting the leakage flow, with a significant percentage of 66.9% compared to a low percentage of 12.6% of the upstream slope.
Online since: May 2012
Authors: Hui Xu, Peng Fu, Ai Juan Li, Xi Yan Guo
Thermodynamic models and its application for open feedwater heaters under transient conditions
Xiyan Guo1,a, Aiyuan Li1, Hui Xu2, Peng Fu1
1School of Energy Power and Mechanical Engineering, North China Electric Power University, China
2School of Control and Computer Engineering, North China Electric Power University, China
ag_x_y@163.com
Keywords: Thermodynamic models; energy distribution; surface heaters; transient conditions
Abstract: The aim of this paper is to find the energy distribution principle of open feedwater heaters under transient conditions.
The major factor is the exergy stored in exothermic fluid.
Depending on the fluid properties of the heater, it consists of vapor-cooler section, vapor-condensate section and drain-cooler section.
We can see from table that the error caused by the exergy stored in fluid is the largest and the second is the exergy stored in metal.The primary factors of exergy stored in fluid are temperature, pressure and flow rate.
Refrigeration & Air-condition,2002, 3: 5-8 (in Chinese) [9] Jingyan Xing, Hai-qing Wang.Factors of affecting exergetic efficiency of heat exchanger and their functions in thermoeconomic analysis[J].
The major factor is the exergy stored in exothermic fluid.
Depending on the fluid properties of the heater, it consists of vapor-cooler section, vapor-condensate section and drain-cooler section.
We can see from table that the error caused by the exergy stored in fluid is the largest and the second is the exergy stored in metal.The primary factors of exergy stored in fluid are temperature, pressure and flow rate.
Refrigeration & Air-condition,2002, 3: 5-8 (in Chinese) [9] Jingyan Xing, Hai-qing Wang.Factors of affecting exergetic efficiency of heat exchanger and their functions in thermoeconomic analysis[J].