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Online since: September 2014
Authors: Omer El Fakir, S. Das, I. Stone, G. Scamans, Z. Fan, L. Wang, D. Balint, J.P. Dear, Jian Guo Lin
Table 2: Physical properties of AZ31
AZ31 physical property
Value
Thermal conductivity [W/mK]
76.9
Specific heat [J/kgK]
1040
Density[kg/m³]
1780
Poisson’s Ratio
0.35
Young’s Modulus [GPa]
45
Table 3: FE model parameters
Parameter
Value
Tool temperature [°C]
20
Blank temperature [°C]
450
Forming speed [mm/s]
250
Number of elements for blank
3250
Friction coefficient
0.13
Heat transfer coefficient [J/m²sK]
46x103
Results and discussion
The results of the uniaxial tensile tests at temperatures between 20°C and 450°C are shown in Fig. 5(a) for a strain rate of 1/s.
This could be due to a very fine initial grain size in the alloy.
This could be due to a very fine initial grain size in the alloy.
Online since: April 2012
Authors: Xue Yong Zhou, Xiang Yun Liu, Lei Lu, Lei Gu, Jing Jing Liu
Starch belongs to grain products, the supply of starch will become shortage with the rapid increase of population.
Determination of the mean molecular weight The molecular weight of filled plastic was determined by viscosity number method.
Determination of the mean molecular weight The molecular weight of filled plastic was determined by viscosity number method.
Online since: July 2011
Authors: Qing Fen Li, Ping Long, Yong Lei Xin, Li Li Xue, Li Kun Xu
However, La-containing oxide electrode exhibits predominantly cracked-mud morphology and the small grains structure vanishes(Figure 1B), indicating less crystallization of the electrode.
Since the voltammetric charge, q*, obtained by graphic integration of the j-E curve, is proportional to the number of surface active sites, it can be taken as a measure of the electrochemical surface area[6].
Since the voltammetric charge, q*, obtained by graphic integration of the j-E curve, is proportional to the number of surface active sites, it can be taken as a measure of the electrochemical surface area[6].
Online since: August 2012
Authors: Alfeu Saraiva Ramos, Pietro Carelli Reis de Oliveira Caltabiano, Rodrigo Fernando Costa Marques, Maria Gabriela Nogueira Campos, Luis Rogério de Oliveira Hein, Marisa Aparecida de Souza
Recent works involving the ball milling of powder mixtures containing Al2O3 showed that no significant variation in the lattice parameters (or grain/particle size) occurred after milling for more than 20 h (SPEX 8000D mill), using stainless steel vial and spheres, and a BPR of 10:1 [15].
It was noted that the diameter and weight contractions were continuously reduced with the increasing milling times indicating that the relative density of the mechanically alloyed and sintered samples increases with increasing milling time, because of a higher amount of contact points between the particles activated the matter transport leading to the high number of the necks between particles, motivating the diffusion and evaporation–condensation of the matter on surfaces with consequent bulk densification [15].
It was noted that the diameter and weight contractions were continuously reduced with the increasing milling times indicating that the relative density of the mechanically alloyed and sintered samples increases with increasing milling time, because of a higher amount of contact points between the particles activated the matter transport leading to the high number of the necks between particles, motivating the diffusion and evaporation–condensation of the matter on surfaces with consequent bulk densification [15].
Online since: October 2012
Authors: Song Hua Jiao, Ru Xiong Li, Yan Wu
Control system schematic diagram
Curved beam of append structural with“”shape can avoid splash and other grain from pollution the guide on the welding process.
System parameters is pitch L (mm/r), each rotating pulse number of motor p, transformation ratio n(when motor connect silk pole, transformation ratio value 1) ,instruction double frequency pulse of drive m.
System parameters is pitch L (mm/r), each rotating pulse number of motor p, transformation ratio n(when motor connect silk pole, transformation ratio value 1) ,instruction double frequency pulse of drive m.
Online since: October 2007
Authors: Radu L. Orban, Luisa N. Mîtcă
Unlike composites, in cermets the metal-ceramic
combination occurs on a microscale, the non-metallic phase being fine grains (of average
dimensions less than ~ 100 µm) that are well dispersed into the metallic matrix.
For this purpose, as well as for microscopic analyses and hardness determination, from each composition a number of 3 cylindrical samples of 11.28 mm diameter and 8 mm height have been realized by cold uniaxial bilateral compaction in steel dies, with die wall lubrication at 700 MPa.
For this purpose, as well as for microscopic analyses and hardness determination, from each composition a number of 3 cylindrical samples of 11.28 mm diameter and 8 mm height have been realized by cold uniaxial bilateral compaction in steel dies, with die wall lubrication at 700 MPa.
Online since: August 2008
Authors: Francisco Rolando Valenzuela-Díaz, Valquiria F.J. Kozievitch, Guillermo Ruperto Martín-Cortés, S.M. Toffoli, P. Souza Santos, Shirley Cosin
The requirement of high quality,
therefore great part of the material is destined to exportation, and the high number of
produced parts daily, make with that the amount of powder waste rejects, reach
astronomical volumes.
The dry material was disintegrated, and milled in a model TIGER hammers mill, and grain size classified in ABNT no. 80 sieve.
The dry material was disintegrated, and milled in a model TIGER hammers mill, and grain size classified in ABNT no. 80 sieve.
Online since: June 2008
Authors: Francicso Gomez Cuevas, José M. Gallardo, Juan Manuel Montes Martos, Petr Urban
Based on some metallic elements, amorphous metal alloys can be obtained in a large
number of systems by various methods, such as rapid solidification from the melt [3] or mechanical
alloying (MA) [4].
It was found that the initial stage of milling, up to 5 h for Al50Ti50 and less than 20 h for Fe75Si25 (not shown in fig. 1), resulted in decreasing the intensities and broadening the width of all the diffraction peaks, which indicates a grain size reduction.
It was found that the initial stage of milling, up to 5 h for Al50Ti50 and less than 20 h for Fe75Si25 (not shown in fig. 1), resulted in decreasing the intensities and broadening the width of all the diffraction peaks, which indicates a grain size reduction.
Online since: February 2007
Authors: Seiji Ban, Masahiro Nawa, Hideo Sato, H. Nakanishi, Y. Suehiro
Measurements of Vickers hardness number (VHN) were repeated 6 times in each specimen
before and after sandblasting (0.2 MPa) of Y-TZP and the nanocomposite.
Kosmac et al. also reported that sandblasting significantly increased the biaxial flexure strength of fine and course grained Y-TZP [10], and significantly decreased with annealing at 900˚C for 1 h [3].
Kosmac et al. also reported that sandblasting significantly increased the biaxial flexure strength of fine and course grained Y-TZP [10], and significantly decreased with annealing at 900˚C for 1 h [3].
Online since: December 2006
Authors: Lin Teng, Qing Hong Le
GNC complex products always consist of a large number of components from different
disciplines.
Internal Stress Crack Bubble Casting Process Mixture Radio Curing Agent Flexibillizer Epoxy Resin Filler Vacuum Resin Casting Mechanical Agitation Granularity distribution Dosage Type Grain Diameter Contractibility Elasticity Fig.2 The RCA model of epoxy resin composition casting failure Conclusion The purpose of this study was to construct an effective CAI system which can manage knowledge across our own organization and other domains, also provide structure, simplicity and predictability to the innovation process for GNC complex products.
Internal Stress Crack Bubble Casting Process Mixture Radio Curing Agent Flexibillizer Epoxy Resin Filler Vacuum Resin Casting Mechanical Agitation Granularity distribution Dosage Type Grain Diameter Contractibility Elasticity Fig.2 The RCA model of epoxy resin composition casting failure Conclusion The purpose of this study was to construct an effective CAI system which can manage knowledge across our own organization and other domains, also provide structure, simplicity and predictability to the innovation process for GNC complex products.