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  • 1
    Electronic Resource
    Electronic Resource
    Morphology and Distribution of in Al-Fe Alloy under an Alternating Magnetic Field (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 933-936 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The aim of this work is to study the effect of a low frequency alternating magnetic field onmorphology and distribution of A3F2 in the Al-2.89 wt.% Fe alloy. At the cooling rate of 0.05 ºC/s,only Al3Fe phase was observed in the iron-containing intermetallics. It was noteworthy that,compared with the conventional solidification, the primary Al3Fe phase was refined and accumulatedtowards the center of the sample by applying the alternating magnetic field. This phenomenon isconsidered as the result of the larger Lorentz force acting on the Al3Fe phase than the Al matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.933.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrasonic Treatment of Magnesium Alloy Melts and its Effects on Solidification Microstructures (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 129-132 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effects of high intensity ultrasonic melt treatment on the microstructure of magnesiumalloys were investigated in this paper. Magnesium melts were treated with power ultrasonic wave andthen cooled to a predetermined temperature. With the increase in ultrasonic power, the structureexhibited refined and spheroidzed crystal grains. After further increasing the ultrasonic power, thegrains tended to somewhat coarsened. And increasing the ultrasonic processing time led to a grainrefinement of magnesium alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.129.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructures and Mechanical Properties of AZ31B Extruded Sheets from Different Casting Processing (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 399-402 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A novel way producing magnesium billets, LFEC (low frequency electromagnetic castingprocessing), was developed in Northeastern University in China. The high-quality magnesium billetswith less macrosegregation, refined microstructure, and better surface quality were achieved becausethe temperature field and the flow pattern of magnesium DC casting were improved significantly afterapplying low frequency electromagnetic field. Extrusion is an important plastic deformation processfor magnesium alloys. In this research, the magnesium billets from LFEC were extruded through aspecial designed die into sheets. The results of investigation on AZ31B indicated that the extrusionvelocity has obvious effects on their microstructures and mechanical properties and the sheets fromLFEC had finer microstructure and higher mechanical properties than that from conventional DCcasting
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.399.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Study on Electromagnetic Vibration Casting (EVC) of Magnesium Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 207-210 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Electromagnetic Vibration Casting (EVC) is a new effective technical processing foroptimizing solidification microstructures of light alloys. In this paper, this technology was inducedinto magnesium alloy DC casting for providing high-quality large diameter billets. The effects ofvibration frequency and current intensities on the microstructures of large diameter billets wereinvestigated. The results indicate that electromagnetic vibration would refine grains and the reducemacrosegregation effectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.207.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Low-Frequency Electromagnetic Field Influencing Horizontal Direct Chill Casting of Aluminum Alloy Rods (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 691-696 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The horizontal direct chill (HDC) casting process is a well-established production route foran aluminum alloy ingot; however, the ingot may suffer from inhomogeneous microstructures andserious macrosegregation due to the unbalanced cooling condition and gravitational effect. In order tocontrol the defect, a low frequency electromagnetic field has been applied in the HDC casting processand its influences on microstructures and macrosegregation have been studied. The results show thatthe low frequency electromagnetic field can improve macrostructures, reduce inhomogeneousmicrostructures and macrosegregation in HDC product; and two main parameters of theelectromagnetic field—density and frequency influence the microstructures and solution distributionalong the diameter of the ingot significantly. In the range of ampere-turns and frequency employed inthe experiments, the optimum ampere-turns and frequency have been found to be 10000At, 30Hz
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.691.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Numerical Modeling of Low Frequency Electromagnetic Casting of 7XXX Aluminum Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 707-712 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Low frequency electromagnetic casting is a new developed technology that appears in therecent years. In this paper, a comprehensive mathematical model has been developed to describe theinteraction of the multiple physics fields during LFEC (low frequency electromagnetic casting)process. The model is based on a combination of the commercial finite element package ANSYS andthe commercial finite volume package FLUENT, with the former for calculation of theelectromagnetic field and the latter for calculation of the magnetic driven fluid flow, heat transfer andsolidification. Moreover, the model has been verified against the temperature measurements obtainedfrom one 7XXX aluminum alloy billet of 200mm in diameter, during the LFEC casting processes,respectively. There was a good agreement between the calculated results and the measured results.Further, the effects of electromagnetic frequency on fluid flow, temperature field and solidificationduring LFEC process have investigated numerically by using the mathematic model. The choosingcriterion of the electromagnetic frequency during LFEC process has been used in order to obtain thebest structure of the billets by analyzing the effects of fluid flow and temperature field on thesolidification process in the presence of electromagnetic field
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.707.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of Pulse Electric Current on Solidification Structures of Al-Si Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 723-728 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effect of pulse electric current with different density on solidification structures ofhypoeutectic Al-7%Si, Al-10%Si and hypereutectic Al-22%Si alloys was studied. The shape anddistribution of α-Al and Si were analysed.The experimental results showed that α- Al of Al-7% Sialloy is shortened when applied a pulse electric current during the solidification, and themicrostructure turns from the obvious columnar crystal into rosette. After treatment with pulseelectric current, the primary Si of Al-22%Si alloy was refined obviously. When the discharge voltagewas 3kV, Si tended to gather at the edge of the sample and the primary α- Al appeared in thishypereutectic alloy. When the discharge voltage was 6kV, the primary Si was refined much more anddistributes uniformly. Pulse electric current treatment had no evident effect on the approximateeutectic Al-10%Si alloy. The magnetic force was analysed under pulse electric current, and the reasonof the phenomenon was discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.723.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Study on the Process and Mechanism of Rolling-Bonding between Magnesium and Aluminum (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 467-470 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Application of magnesium alloy is restricted by its bad formability and low corrosionresistance. In order to resolve these problems, rolling-bonding has been tried as a new method.Pre-heating, rolling and annealing were used in the process of bonding, and aluminum claddingmagnesium alloys obtained. The effects of many parameters in the processes of pre-heating, rollingand heat-treatment on bonding strength have been analyzed, and the mechanism of rolling-bondingbeen studied. It was found that intermediate phase played an important role in the bonding. Goodbonding of aluminum cladding magnesium alloys achieved after annealing at 200oC for 1 hour
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.467.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of Low Frequency Electromagnetic Field on Microstructures and Macro-Segregation of Direct Chill Casting Al-19.2%Si Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 953-956 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The influences of low frequency electromagnetic field on microstructures andmacro-segregation in direct chill casting process were investigated in the experiments，Al-19.2%Sialloys were semi-continuously cast into ingots with 100 mm in diameter. Microstructures andmacrostructures of samples taken from different part of the cast with different electromagnetic fieldconditions were characterized by optical microscopy. The results showed that low frequencyelectromagnetic field refines the microstructures and reduces macro-segregation. Unlike castingwithout electromagnetic field, the primary Si grains were homogeneous with fine dimensions and themorphology of the primary silicon exhibited small blocky structures or near-spherical structures.Further more, decreasing frequency is beneficial to the improvement. In the range conditions in theexperiments, the optimum frequency is found to be 15Hz. During casting, the temperature of theliquid metal in the sump was monitored. The results shown, under LFEC the width of the liquid-solidregion became narrowed and the temperature field in the sump also became homogeneous
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.953.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Coupled Modeling of Electromagnetic Field, Fluid Flow, Heat Transfer and Solidification during Conventional DC Casting and Low Frequency Electromagnetic Casting of 7XXX Aluminum Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 18-23 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A comprehensive mathematical model has been developed to describe the interaction ofthe multiple physics fields during the conventional DC casting and LFEC (low frequencyelectromagnetic casting) process. The model is based on a combination of the commercial finiteelement package ANSYS and the commercial finite volume package FLUENT, with the former forthe calculation of the electromagnetic field and the latter for the calculation of the magnetic drivenfluid flow, heat transfer and solidification. Moreover, the model has been verified against thetemperature measurements obtained from two 7XXX aluminum alloy billets of 200mm diameter,cast during the conventional DC casting and the LFEC casting processes. In addition, ameasurement of the sump shape of the billets were carried out by using addition melting metal ofAl-30%Cu alloy into the billets during casting process. There was a good agreement between thecalculated results and the measured results. Further, comparison of the calculated results during theLFEC process with that during the conventional DC casting process indicated that velocity patterns,temperature profiles and the sump depth are strongly modified by the application of a lowfrequency electromagnetic field during the DC casting
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.18.pdf
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