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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 215-218 
    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 deformation behavior of AZ31 magnesium alloy has been investigated by isothermal compression at temperatures between 573-723K and at constant strain rates ranging from 10-3 -1s-1. It is shown that the form of flow stress curves is very sensitive to temperature and strain rate. In the experimental domain studied, the flow stresses are modeled using a power law with an average activation energy of 145.16 kJ/mol, and dynamic recrystallization (DRX) occurs. The critical strainfor DRX is determined by analysis of flow stress curves. The ratio of the critical strain to the peak strain falls in the range of 0.4-0.5. At low temperatures and high strai rates, the deformation become macroscopically inhomogeneous, and the fracture of the specimens is accompanied by shear banding. Grain refinement resulting from DRX is less effective at high temperatures due to rapid grain growth. It is also shown that there is no difference between peak stress and stable state stress at high temperatures and lower strain rates, presenting the feature of continuous dynamic recrystallization (CDRX)
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 413-418 
    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: Recent research and development status of wrought magnesium alloys in China isreviewed, and more attentions are paid to structure controlling, plastic processing, welding, surface treatment and product application. The control of alloy phases, grain refinement, deforming behavior and twin-roll strip casting process are discussed. The existing problems on the research and development of wrought magnesium alloys in China are analyzed
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 445-448 
    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: Conventional manufacturing processes of metal and alloys sheets are rolling. The poor formability of magnesium alloys at room temperature makes rolling difficult. In the present paper, a manufacturing technique of sheets by powder rolling was employed to fabricate magnesium alloy sheets. The technique consisted of roll compaction, sintering, re-rolling and annealing. Powders of Mg-3 wt% Al mixed using a global mill were roll compacted into green sheets using two counter rotating rolls to the thickness of approximately 0.60 mm. Roll compacted green sheets were sinteredat 823 K in argon atmosphere. Sintered green sheets were then re-rolled at ambient temperature to approximately 0.22 mm to obtain fully dense sheets. There was no significant edge cracking observed in the process of cold rolling. It is reasonable to believe that powder rolling is a promising technique for manufacturing magnesium alloys sheets
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 275-280 
    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: In this paper, the basic formability of stamping of magnesium-alloy AZ31B sheet has beenstudied through experiments. The stamping formability of magnesium-alloy AZ31B sheet, such asthe conical cup value, bending formability, deep drawing formability, formability of hole expanding,forming limit has been studied by simulating processing experiments. The formability of stampingsupplies the basic reference data for the stamping processing. It is also found that the formability ofstamping of magnesium-alloy AZ31B sheets is poor at room temperature and is excellent atintermediate and high temperatures
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1061-1064 
    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 dynamic recrystallization characteristic of 3104 alloy has been investigated byisothermal compression deformation at temperatures from 573K to 773K under constant strain ratesranges from 10-3s-1 to 1s-1. It was shown that the form of flow stress curves were very sensitive totemperature and strain rate. At high temperatures and low strain rates, dynamic recrystallization of3104 alloy deformation occured. The critical value for dynamic recrystallization start was determinedfrom an inflection point that was observed in the plot of work hardening rate vs. flow stress andverified metallograhically based on quenching samples interrupted during deformation. In theexperimental domain studied, the ratio of the critical strain for the initiation of dynamicrecrystallization to that of the peak strain falled in the range 0.4-0.6. Furthermore, the dependence ofεc on Zener-Hollomon parameter( Z) has been developed
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2131-2134 
    ISSN: 1013-9826
    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 tin and tin oxide nanoparticles were synthesized by organometallic compound route.Decomposition of the organometallic precursor [Sn(N(CH3)2)2]2 in a controlled condition leads to theformation of monodisperse nanoparticles Sn/SnOx . The microstructures of the particles before andafter oxidation were analyzed by transmission electron microscope (TEM), high-resolutiontransmission electron microscope (HRTEM), and X-ray diffraction. The results indicate that theregular Sn/SnOx particles consist of a well-crystallised tin core covered with an amorphous layer oftin oxide. Full oxidation of the particles into SnO2 by heating in the air doesn’t change the size andthe morphology. Nano-particulate tin dioxide gas sensor was prepared by drop depositing of SnO2nanoparticles on to silicon platform, which was created by classical integrated circuits technology,and sintering into porous sensitive layer in situ on test system. The response of SnO2 nanoparticle gassensor to CO gas was performed by measuring the resistance of the sensor on test system on 60ppmand 200ppm levels. The sensor shows relatively high sensitivity to tested carbon monoxide
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 437-438 (Oct. 2003), p. 149-152 
    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
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 793-796 
    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 model was developed for the analysis and prediction of correlation betweencomposition and mechanical properties of Mg-Al-Zn (AZ) magnesium alloys by applying artificial neural network (ANN). The input parameters of the neural network (NN) are alloy composition. The outputs of the NN model are important mechanical properties, including ultimate tensile strength, tensile yield strength and elongation. The model is based on multilayer feedforward neural network. The NN was trained with comprehensive data set collected from domestic and foreignliterature. A very good performance of the neural network was achieved. The model can be used for the simulation and prediction of mechanical properties of AZ system magnesium alloys as functions of composition
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 437-438 
    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 infiltration pressure field of fiber reinforced AZ91D was studied in this paper. Thecarbon fiber T300 was selected and covered with rough TiO2 coat by means of plasma techniques.These carbon fibers were combined together and a kind of continuous pre-former with manymicro-passes was constructed. When this pre-former went though a infiltration cabin filled withmolten magnesium alloys, the melt infiltrated into pre-former through those micro-passes underinfiltration pressure. A physical model and related mathematic model were built to relate this process.The relationship among pressure (p), infiltration flow rate change (e) and the location of infiltrationflow (r) was molded
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1225-1228 
    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: By means of tensile and compression creep testing and SEM, TEM observation, aninvestigation has been made into the microstructure evolution of a single crystal nickel basesuperalloy during tensile / compression creep. Results show that the cubic γ′ phase in the superalloy istransformed into the N-type meshlike structure along the direction vertical to stress axis during tensilecreep. The cubic γ′ phase is transformed into the P-type structure along the direction parallel to stressaxis during compression creep. An obvious asymmetry strain of the alloy occurs during tensile andcompression creep, the formation of the needle-like γ′ rafts during compression creep is a main reasonof the alloy displaying a smaller strain. During compressive creep, the deformation feature of the alloyis the 〈110〉 and (1/3) 〈112〉 super dislocations shearing into the γ′ rafts. The deformationmechanism of the alloy, in the stage state of tensile creep, is dislocation climb over the γ′ rafts
    Type of Medium: Electronic Resource
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