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Online since: January 2013
Authors: Jong Ho Lee, Choong Soo Chi, Han Jun Oh
The template wetting method utilizing the decomposition of silver acetate can be applied to produce a silver nanostructured material with high functional properties.
Introduction Nanowires have attracted considerable interest since they have a high specific surface area and anisotropic, which affects their electronic, photonic, mechanical and chemical properties.
The kinetics of decomposition reaction of silver acetate can be described by the equation (1): (1) where a is the degree of conversion, t is the time, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant.
The template wetting method utilizing the decomposition of silver acetate can be applied to produce a silver nanostructured material with high functional properties.
Introduction Nanowires have attracted considerable interest since they have a high specific surface area and anisotropic, which affects their electronic, photonic, mechanical and chemical properties.
The kinetics of decomposition reaction of silver acetate can be described by the equation (1): (1) where a is the degree of conversion, t is the time, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant.
The template wetting method utilizing the decomposition of silver acetate can be applied to produce a silver nanostructured material with high functional properties.
Online since: May 2013
Authors: Li Juan Li, Qi Jie Zhai, Li Hua Liu
Applications of magnetic fields in metallurgical recrystallization processes have gleaned recent attention for their ability to control microstructure and improve properties.
Such research provides the initial steps in establishing patterns and characteristic trends for the controlled application of pulsed magnetic fields to produce specific microstructural properties in metallic materials, a potentially commercially viable process.
Conversely, Martikainen and Lindroos [8] demonstrated that 1.5 T steady magnetic annealing retarded ferrite recrystallization by affecting magnetic ordering.
Cumulatively, previous work suggests that steady magnetic annealing exerts an effect on grain size that can be predicted by the balance of two factors: the grain growth retardation effect and the boundary motion acceleration effect.
Previous research has established that texture formation during recrystallization and grain growth are affected by the magnetic field properties, including intensity [8, 11, 14].
Such research provides the initial steps in establishing patterns and characteristic trends for the controlled application of pulsed magnetic fields to produce specific microstructural properties in metallic materials, a potentially commercially viable process.
Conversely, Martikainen and Lindroos [8] demonstrated that 1.5 T steady magnetic annealing retarded ferrite recrystallization by affecting magnetic ordering.
Cumulatively, previous work suggests that steady magnetic annealing exerts an effect on grain size that can be predicted by the balance of two factors: the grain growth retardation effect and the boundary motion acceleration effect.
Previous research has established that texture formation during recrystallization and grain growth are affected by the magnetic field properties, including intensity [8, 11, 14].
Online since: October 2002
Authors: Frédéric Barlat, José Grácio, Jeong Whan Yoon, Robert E. Dick
The geometry,
finite element mesh, material behavior, element properties, and boundary conditions are the main
features of typical FE models.
Material Behavior FE users need data and models to characterize the mechanical behavior of materials used to fabricate new products.
Constitutive models and their associated coefficients represent a new way to describe material properties, a way that can be used by FE users.
Anisotropy has been identified as a factor contributing to failure in materials.
Conclusion This paper describes the main microstructural features affecting the plastic deformation of aluminum alloys.
Material Behavior FE users need data and models to characterize the mechanical behavior of materials used to fabricate new products.
Constitutive models and their associated coefficients represent a new way to describe material properties, a way that can be used by FE users.
Anisotropy has been identified as a factor contributing to failure in materials.
Conclusion This paper describes the main microstructural features affecting the plastic deformation of aluminum alloys.
Online since: January 2012
Authors: Cai Jun Gan, Kai Liao
But center blind-hole method is not suitable in measuring the gradient distribution with large stress gradient while X-ray method would be much affected by surface treatments and material microscopic inhomogeneity despite its capable of reflecting local details of the stress distribution.
On one hand, credibility of the measurements of the two methods was analyzed comparatively; on the other hand, applicable situation and influencing factors of the two methods were discussed.
Table 1 Detail parameters of X-ray diffraction method in stress measurement Parameter Value Parameter Value Measuring method Fixed y method Diffraction plane Steel (211), Al (331) X-ray tube target Steel (Cr), Al (Co) Peak fitting method Gaussian Tube voltage 20 [kV] Collimator dimension 2×5[ mm] Tube current 4[ mA] Exposure time / number 2[s ]/ 20 Elastic constant 1/2S2 18.5606×10-6 j0 value (°) ±28,±22.4,±16,±10.06, ±2.1,0 Hole-drilling instruments and parameters in the central blind-hole method consist of HK21B residual stresses measuring device manufactured by Shandong Huayun Electrical and Mechanical Technology Co., Ltd., 120Ω TJ120-1.5-j1.5 rosette strain gauge, drilling diameter of 1.5mm and depth of 2mm, and A, B coefficients are calibrated by a cantilever.
While central blind-hole method still has a good performance since it mainly considers material macroscopic properties.
[5] ASTM Committee E28 on Mechanical Testing.
On one hand, credibility of the measurements of the two methods was analyzed comparatively; on the other hand, applicable situation and influencing factors of the two methods were discussed.
Table 1 Detail parameters of X-ray diffraction method in stress measurement Parameter Value Parameter Value Measuring method Fixed y method Diffraction plane Steel (211), Al (331) X-ray tube target Steel (Cr), Al (Co) Peak fitting method Gaussian Tube voltage 20 [kV] Collimator dimension 2×5[ mm] Tube current 4[ mA] Exposure time / number 2[s ]/ 20 Elastic constant 1/2S2 18.5606×10-6 j0 value (°) ±28,±22.4,±16,±10.06, ±2.1,0 Hole-drilling instruments and parameters in the central blind-hole method consist of HK21B residual stresses measuring device manufactured by Shandong Huayun Electrical and Mechanical Technology Co., Ltd., 120Ω TJ120-1.5-j1.5 rosette strain gauge, drilling diameter of 1.5mm and depth of 2mm, and A, B coefficients are calibrated by a cantilever.
While central blind-hole method still has a good performance since it mainly considers material macroscopic properties.
[5] ASTM Committee E28 on Mechanical Testing.
Online since: June 2010
Authors: Yoshitaka Iwabuchi, Isao Kobayashi
This paper discussed several factors affecting intergranular failure along
prior austenite grain boundary of type CA6NM stainless cast steel with special emphasis on heat
treatment and alloying elements.
The influence of C, Si, Mo and P on metallographic and mechanical properties was investigated using 11 heats of which chemical composition is given in Table 1.
A typical heat treatment to obtain the desired properties is austenitizing at 1223K for 28.8ks, followed by air cooling to ambient temperature and tempering for 36ks at 893K.
The influence of C, Si, Mo and P on metallographic and mechanical properties was investigated using 11 heats of which chemical composition is given in Table 1.
A typical heat treatment to obtain the desired properties is austenitizing at 1223K for 28.8ks, followed by air cooling to ambient temperature and tempering for 36ks at 893K.
Online since: May 2020
Authors: Zheng Li, Zi Jian He, Ying Cheng Zhou, Yi Tang, Yu Fang Chen, Tao Jin
Effect of DMSO Dosage on Hydrophobic Properties of HMCFC Prepared by ARGET-ATRP.
Effect of DMSO Treatment Time on Hydrophobic Properties of HMCFC Prepared by ARGET-ATRP. 10% DMSO was added to ARGET-ATRP reaction system for preparing HMCFC, and the change on the hydrophobic properties of HMCFC with treatment time can be found in Fig. 3.
The content of halogen Br immobilized on the surface of cotton fiber directly affects the grafting rate and grafting density of ARGET-ATRP reaction, therefore the content of Br on the surface of cotton filter cloth has a crucial influence on the hydrophobic properties of HMCFC.
Raw cotton fiber is extremely hydrophilic [14,15] as the nature properties of cellulose.
Wu, Surface modification of boron nitride nanosheets with polycationic electrolytes through ARGET ATRP for enhancing mechanical properties of cellulose film, Mater.
Effect of DMSO Treatment Time on Hydrophobic Properties of HMCFC Prepared by ARGET-ATRP. 10% DMSO was added to ARGET-ATRP reaction system for preparing HMCFC, and the change on the hydrophobic properties of HMCFC with treatment time can be found in Fig. 3.
The content of halogen Br immobilized on the surface of cotton fiber directly affects the grafting rate and grafting density of ARGET-ATRP reaction, therefore the content of Br on the surface of cotton filter cloth has a crucial influence on the hydrophobic properties of HMCFC.
Raw cotton fiber is extremely hydrophilic [14,15] as the nature properties of cellulose.
Wu, Surface modification of boron nitride nanosheets with polycationic electrolytes through ARGET ATRP for enhancing mechanical properties of cellulose film, Mater.
Online since: November 2012
Authors: Priit Kulu, Andrei Bogatov, Vitali Podgursky, Martin Freund
Tribological properties of DLC depend on the intrinsic factors (the ratio of sp3/sp2 hybridization of carbon bonds, hydrogen and impurities concentration, surface roughness, etc) and extrinsic factors (test conditions) [1-3].
In other words, due to post-treatment a lifetime of the coating can be significantly extended, i.e. properties at the later stages of coating development can strongly depend on the properties of a freshly deposited coating.
Tribological properties of a material under lubricated conditions differ from those under non-lubricated ones.
Subramaniam, Friction and wear properties of chemomechanically polished diamond films, J.
Ruan, Tribological properties of polished diamond films, J.
In other words, due to post-treatment a lifetime of the coating can be significantly extended, i.e. properties at the later stages of coating development can strongly depend on the properties of a freshly deposited coating.
Tribological properties of a material under lubricated conditions differ from those under non-lubricated ones.
Subramaniam, Friction and wear properties of chemomechanically polished diamond films, J.
Ruan, Tribological properties of polished diamond films, J.
Online since: September 2017
Authors: D.A. Bashmakov, D.I. Israphilov, A.T. Galiakbarov
It is necessary to determine the main factors affecting the process and the degree of their influence to solve problem.
Andrews, Stress fields around inclusions and their relation to mechanical properties, JISI, 210 (1972) 246-253
The study began manufacturing processes and their influence on the final properties of the product, Coll.
Andrews, Stress fields around inclusions and their relation to mechanical properties, JISI, 210 (1972) 246-253
The study began manufacturing processes and their influence on the final properties of the product, Coll.
Online since: February 2013
Authors: Fang Liu, Li Tao Chang, Xin Xin, Wei Hong Zhang, Dang Jia, Feng Qi, Sheng Chao Li, Lian Xu Yu
It is widely accepted that both the amount and the distribution of δ phase have important effects on the alloy’s microstructure and mechanical properties [3,4], especially the notch sensitivity.
Concentration gradient and temperature are the main factors affecting the diffusion process.
Hu, Effects of phosphorus on the δ-Ni3Nb phase precipitation and the stress rupture properties in alloy 718, Mater.Sci.Eng., 1998;247:173-179.
Concentration gradient and temperature are the main factors affecting the diffusion process.
Hu, Effects of phosphorus on the δ-Ni3Nb phase precipitation and the stress rupture properties in alloy 718, Mater.Sci.Eng., 1998;247:173-179.
Online since: February 2016
Authors: Natasa Naprstkova, Martin Novák, Hiroshi Kasuga
Introduction
Wear of the grinding wheel is one of the most important factors affecting accuracy and surface quality.
According to the properties of grinding wheels (hardness, type of binder, abrasives etc.) and cutting conditions during grinding occurs either blunting (chipping inconveniently laid abrasive grains) or self-sharpening (a specific characteristic of grinding wheels).
In engineering is most commonly used in the drawings and part lists these values roughness: Ra, Rz, and Rt. [7, 9] For the experiment was chosen ductile iron DIN GGG60. which has good mechanical properties and machinability.
According to the properties of grinding wheels (hardness, type of binder, abrasives etc.) and cutting conditions during grinding occurs either blunting (chipping inconveniently laid abrasive grains) or self-sharpening (a specific characteristic of grinding wheels).
In engineering is most commonly used in the drawings and part lists these values roughness: Ra, Rz, and Rt. [7, 9] For the experiment was chosen ductile iron DIN GGG60. which has good mechanical properties and machinability.