influence of si phase on fatigue properties of aluminium alloys

... Precipitation of eutectic Si 562 564 558 Precipitation of Al6Mg3FeSi6+Mg 2Si 554 532 525 Precipitation of Al2Cu 510 510 507 Precipitation of Al5Mg8Cu 2Si6 490 499 L→(Al) +Si+ AlMnFeSi L→(Al)+Al2Cu+Al5FeSi ... shaped, are inclusions of the phase consisting of Al, Si, Mn and Fe (Fig 2,7 and Tab 3) Since it is rather difficult to produce detailed identification of intermetallic using only one method (e.g ... L→(Al) +Si+ Al5FeSi 564 L→(Al) +Si+ AlMnFeSi 532 L→(Al)+ Al2Cu+ Al5FeSi 510 L→(Al)+ Al2Cu +Si+ Al5Cu2Mg 8Si6 499 Table Solidification reactions during nonequilibrium conditions in the investigated AlSi5Cu1Mg...

Ngày tải lên: 29/06/2014, 08:20

... Degradation of Aluminium Alloys their roles in corrosion of alloys The physico-chemical studies have led to a better characterisation of the composition of intermetallic particles, and, importantly of ... demonstrated to influence the corrosion and wear properties of the alloys (Nisancioglu 2004) Thermodynamic considerations often fail to correctly predict the phase and solid solution content of ... Corrosion and microstructure 3.1 Corrosion fundamentals Corrosion in aluminium alloys is generally of a local nature, because of the separation of anodic and cathodic reactions and solution resistance...

Ngày tải lên: 29/06/2014, 08:20

... (2003) Fatigue crack propagation of aluminium panels repaired with adhesively bonded composite laminates Proceedings of the institution of Mechanical Engineers, Part L: Journal of Materials: Design ... application of low speed laser welding of aluminium for fatigue crack repair is given A discussion on different applications and future development conclude the chapter Background and Reviews 2.1 Aluminium ... the model no longer applies to speeds below mm/s 3.4 Effect of Focusing Positions on Low Speed Welding Figure shows the change in weld penetration as the focusing position changes (positive indicating...

Ngày tải lên: 27/07/2014, 23:31

... corresponds to the crystallization of α-Fe (Si) phase and the second one is related to the forming of boride phase (Fig 2) When increasing cooling rate, the first peak (Tp1) and the second one (Tp2) ... Chau, Influence of Cr substituted for Fe on structure, crystallization and magnetic properties of Fe78-xCrxSi4Nb5B12Ag1 ribbons, Proceedings of the fifth National Solid state Physics Conference, ... the wheel has influenced on the crystallization, magnetic properties and magnetocaloric effect of the ribbons The increase of cooling rate leads to increasing crystallization activation energy and...

Ngày tải lên: 05/03/2014, 14:20

... Fermi level, one electron from the ring should jump into the dot Conclusion In conclusion, we obtained the current expression as a function of the intradot Coulomb interaction and the AB phase The ... ring-dot using the equations of motion method [17] The equations of motion method of the dot Green function gives rise to an infinite order system of higher-order Green functions An approximation procedure ... system of equations, thus producing the closed set of equations To the truncation, we approximate the Green functions up to the second order of U This truncation ensures that most of the interaction...

Ngày tải lên: 05/03/2014, 14:20

... other parts of a nano-object, here most intensive decomposition of an active gas takes place and the highest concentration of mobile silicon atoms or dopants is maintained The control of further ... The MC simulations of the surface steady-state characteristics under the adsorption of silicon-containing molecules together with the surface transport of silicon adatoms towards the sidewalls ... form of a hemisphere of radius R) We note that the NW axial growth (elongation) rate is also expressed as a function of mean concentration of adatoms at the surface Therefore, without considering...

Ngày tải lên: 16/03/2014, 15:18

... The use of these non-conventional carbon materials as support allowed studying the influence of support properties on the physicochemical properties of catalysts Thus, the main conclusions obtained ... particles deposited on oxidized carbons had a similar size to particles deposited on the non-oxidized carbons Hence, the increase of crystallite size detected by XRD was due to the formation of agglomerates, ... gas chromatography The determination of deconvolutions was calculated by using Origin software Results and discussion 3.1 Characterization of carbon supports Carbon materials proposed as catalyst...

Ngày tải lên: 23/04/2014, 22:47

... high-energy ions That might deteriorate the crystallinity of the films, and reduce the concentration of electrically active donor sites Fig 5c shows that the resistivity decreases as the deposition temperature ... of electron density in the films with high deposition temperatures The increased scattering events of electrons with the supplied holes at high deposition temperatures may be responsible for ... the change of n values The differences of n values in UV or IR range may be due to the variation of dielectric functions of the films depending upon the deposition parameters The change of k values...

Ngày tải lên: 24/05/2014, 13:53

... fluences Conclusion In summary, the influence of He+ ion irradiation on the optical properties of ZnO nanorods has been investigated as a possible candidate for space applications of ZnO nanorods ... emission increase after the He+ ion irradiation The decrease in the UV emission is due to degradation in the crystalline quality after the He+ ion irradiation The enhancement in the green emission ... radiation hard conditions In this paper, we have investigated the effect of MeV He+ ion irradiation on the optical properties of ZnO nanorod-based LEDs There are only few reports about the effect of...

Ngày tải lên: 18/06/2014, 22:20

... The reductions of K, COP-RMS and Acc-RMS are a consistent evidence of the reduction of sway amplitude shown by the subject using ABF The increasing of F95% suggests that the postural control applied ... non-redundant role of different senses in multi-sensory integration for the control of posture [29] Whereas vision provides information about the external environment, it allows predictions of ... Parkinson's disease and may allow the comparison of different deep brain stimulation electrode sites based on their effect on structural properties of the COP http://www.jneuroengrehab.com/content/2/1/13...

Ngày tải lên: 19/06/2014, 10:20

... fluences Conclusion In summary, the influence of He+ ion irradiation on the optical properties of ZnO nanorods has been investigated as a possible candidate for space applications of ZnO nanorods ... emission increase after the He+ ion irradiation The decrease in the UV emission is due to degradation in the crystalline quality after the He+ ion irradiation The enhancement in the green emission ... radiation hard conditions In this paper, we have investigated the effect of MeV He+ ion irradiation on the optical properties of ZnO nanorod-based LEDs There are only few reports about the effect of...

Ngày tải lên: 20/06/2014, 04:20

... aggregate in shape of hexagon with directions of polarization respecting the shape Results and discussion 3.1 Unstructured model of aggregates 3.1.1 Random directions of polarization of nanoparticles ... case of short distances, the time-consuming computation by summation has to be done On the basis of known concentration of particles, we are able to estimate the approximate distances among particles ... magnitude of vectors of polarization of all nanoparticles Hence, there is presented evaluation of magnetic forces among particles depending only on the structure of aggregates, respectively, on directions...

Ngày tải lên: 20/06/2014, 22:20

... purpose of this work is to investigate influences of the occupancy of Ti4+ ions at the B-site of Zr4+ host ions with Zr/Ti ratios of 0.7:0.3, 0.6:0.4, 0.5:0.5, and 0.4:0.6 on phase transition and ... that evaporation of Na and Bi might occur which often resulted in a formation of a second phase and compositional inhomogeneity Similarly, several investigations also found the mentioned loss leading ... Influences of phase transition and microstructure on dielectric properties of Bi0.5Na0.5Zr1-xTixO3 ceramics Panupong Jaiban1, Ampika Rachakom1, Sukanda Jiansirisomboon1,2, and Anucha...

Ngày tải lên: 20/06/2014, 23:20

... Ga-assisted deoxidization [21] SiO2 desorbs at temperatures around 900°C depending on the composition and background pressure Ga can react with silicon oxide via the chemical reactions [22] SiO2 ... non-vertical NWs Conclusion In conclusion, we have shown that focus should also be put on the oxide layer thickness and that the substrate preparation is important for self-assisted growth of InAs NWs ... of Si in In [19] C Figure Nanowires grown on Ga-deoxidized substrate (A-C) Sideview scanning electron microscope (SEM) images of the three different wafer positions as marked in (D), corresponding...

Ngày tải lên: 21/06/2014, 00:20

... aggregate in shape of hexagon with directions of polarization respecting the shape Results and discussion 3.1 Unstructured model of aggregates 3.1.1 Random directions of polarization of nanoparticles ... case of short distances, the time-consuming computation by summation has to be done On the basis of known concentration of particles, we are able to estimate the approximate distances among particles ... magnitude of vectors of polarization of all nanoparticles Hence, there is presented evaluation of magnetic forces among particles depending only on the structure of aggregates, respectively, on directions...

Ngày tải lên: 21/06/2014, 00:20

... electrical conductivity of polymer composite films Exp Polym Lett 2010, 4:292 14 Paiva MC, Covas JA, et al: The influence of extensional flow on the dispersion of functionalized carbon nanofibers ... dispersion exhibit the lowest conductivity A better cluster distribution results in lower percolation threshold and higher conductivity for a given volume fraction Conclusions Four dispersion methods ... preparation of VGCNF/epoxy composites It is shown that each method induces a certain level of VGCNF dispersion and distribution in the matrix, and that these have a strong influence on the composite...

Ngày tải lên: 21/06/2014, 03:20

... and electronic properties of nanometer-scale silicon membranes in silicon -on- insulator PhD thesis University of WisconsinMadison, Physics; 2006 Boland JJ: Structure of the H-saturated Si( 001) surface ... Background The influence of the surface condition on silicon nanomembrane conductivity has been dramatically illustrated with scanning tunneling microscopy (STM) on Si( 001) STM on clean bulk Si( 001) ... http://www.nanoscalereslett.com/content/6/1/402 situations The results confirm the extreme sensitivity of the conductance of thin semiconductor sheets to chemical changes and demonstrate how thinness plays a role In addition,...

Ngày tải lên: 21/06/2014, 03:20

... solubility of Ti 4+ ions into the B-site of Zr4+ ions for all compositions investigated Consequently, smaller ions of Ti4+ replacing the host site of Zr4+ ions caused the typical cell volume of BNZ ... compositional inhomogeneity Similarly, several investigations also found the mentioned loss leading to small existence of the second phase [9,10] Nevertheless, the amount of the second phase was ... Ti ion not only reduced the unit cell dimension, but also promoted the phase transition at the composition of Bi0.5Na0.5Zr0.6Ti0.4O3 SEM-BEI images of Bi0.5Na0.5Zr1-xTixO3 ceramics, where x =...

Ngày tải lên: 21/06/2014, 17:20

... Magnetoplasmons Magnetoplasmons are collective excitations of electron gas in magnetic field, occurring as poles of density-todensity response function In the random phase approximation, dispersion of ... sufficient to consider electrons in only one valley and treat existence of the other valley as additional twofold degeneracy of electron states We consider magnetoexciton as an electron-hole pair, ... affect the long-wavelength linear asymptotics of their dispersions Therefore, we conclude here that convergence of magnetoplasmon dispersions in rather fast upon increasing a number of Landau levels...

Ngày tải lên: 22/06/2014, 00:20

... compression test To go further in the investigations, we studied the influence of species on one criterion: ER measured from compression tests Figure presents the evolution of ER in function of temperature ... experimental conditions, the drastic change of mechanical properties can be brought about by the glassy transition of one of the polymeric constituent of wood: lignin [4, 9] Nevertheless, one should ... Each cross represents one value of the three repetitions Figure Illustration of the model of evolution of one criterion respect to temperature seems that the softening phenomenon is not completed...

Ngày tải lên: 08/08/2014, 01:21