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  • 1
    Electronic Resource
    Electronic Resource
    Dynamic Restoration Process of 7050 Aluminum Alloy during Superplastic Deformation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 643-646 
    Details
    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 superplastic deformation and microstructure evolution of solid solution treated 7050aluminum alloy has been investigated. Tensile were conducted at 420 and 460 °C with the strain rateof 1.0×10-4 ~ 1.0×10-1 s-1, and the deformed samples were characterized using optical microscopy,scanning electron microscopy and electron backscatter diffraction. The results show that the solidsolution treated 7050 aluminum alloy gained the maximum elongation of 273% at 460 °C with thestrain rate of 1.0×10-2. At the deformation condition, a large part of plastic deformation wascompleted at an invariable stress. The microstructure transformed from coarse grains to a bimodalmicrostructure and then to a nearly uniform fine microstructure and the dynamic restoration process isfrom dynamic recrystallization plus dynamic recovery to dynamic recrystallization with theincreasing deform strain during superplastic deformation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.643.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    DRX in 7050 Aluminum Alloy during Constraint Deformation Processing at High Temperature (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 647-650 
    Details
    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: Combined extrusion experiment (including direct and indirect extrusion) at 440[removed info] forlarge amount of deformation was carried out with the solution treated AA7050 aluminum alloy.Qualitative description and quantitative characterization were conducted employing electronbackscattered diffraction (EBSD) technique on the microstructure of typical regions with differentfiller contents. These characteristic regions were filled at the following stages: ahead of filling (AF),beginning of filling (BF), mid stage of filling (MF) and the end of filling (EF). EBSD resultsshowed that recrystallization fraction during direct extrusion were 8.3%, 13.5%, 9.3% and 11.2%,for AF, BF, MF and EF, respectively. Recrystallization fraction during indirect extrusion were15.5%, 9.1% 5.2% and 9.9%，for AF, BF, MF and EF, respectively. It shows that the mode and theamount of deformation played an important role in DRX. DRX grains were formed continuouslyduring direct extrusion, while during indirect extrusion, fewer DRX grains generated, and onlyoriginally generated DRX grains grew larger gradually
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.647.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    The Contact Resistance and Arc Erosion Behavior of Separable C〈sub〉P〈/sub〉-Nb-Cr/Cu-Cd Electrical Contact Material (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 886-889 
    Details
    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: CP-Nb-Cr/Cu-Cd electrical contact material, which contains 1.7wt.% of Cd, 0.5wt.% of CP(man-made diamond particles), 2.0 wt.% of Nb and 0.7 wt.% of Cr, was fabricated by powdermetallurgy process. The contact material was installed in different ac contactors covering currentrange from 40 to 630A. While tested under AC-4 electrical load, the electrical contact material wasworn out gradually by repeated electrical arc, and microstructure of the arc-affected surface layerchanged dramatically. Mechanism of arc erosion process and contact resistance fluctuation wasdiscussed by corresponding microstructure observation and chemical composition analysis of thesurface layer. CP-Nb-Cr/Cu-Cd electrical contact material is capable to be used in 63~250A accontactors under AC-4 working conditions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.886.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Original Microstructure on the Hot Compression Behavior of Superalloy 718 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 515-518 
    Details
    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: Hot compression tests at different temperatures and strain rates were performed onsuperalloy 718 annealed at 1100 ºC for 30 min as well as 950 ºC for 30 min in order to investigatethe effect of the original microstructure on the hot deformation behavior. The results show that the δphase precipitated on the grain boundaries of superalloy 718 prior to hot deformation leads to adecrease of the flow stress, which can be attributed to the drop of the matrix strength. The activationenergy (Q) for hot deformation of the fine-grained material with δ phase on the grain boundaries isdetermined to be 381 kJ/mol, which is much lower than that of the coarse-grained material withoutδ phase (472 kJ/mol). It is suggested that the initial δ phase precipitated on the grain boundaries ofthe annealed material affect the thermal activation process of hot deformation for superalloy 718,resulting in the decrease of activation energy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.515.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Texture Development during Cold and Cryogenic Rolling in AA 7055 Aluminum Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 639-642 
    Details
    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 texture evolution of polycrystalline AA 7055 aluminum alloy during rolling about15% and 50% at room temperature and cryogenic temperature has been investigated by electronback-scattered diffraction (EBSD). With increasing the rolling reduction, the intensities of thecomponents of the β fiber increase at both rolling temperature and simultaneously, the sheartextures disappear gradually. The lattice rotation paths from the {001}〈110〉 orientation to β fiberwas discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.639.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    High Temperature Deformation Mechanism of 7075 Aluminum Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 691-694 
    Details
    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: This paper presents the high temperature deformation behavior of 7075 aluminum alloyafter T6 heat treatment by using electron tensile test machine with a temperature range of 230 - 440 ºC,strain rate of 0.01 s-1, deformation of 50 % and 100 %, respectively. The morphology of the fracturedsurfaces, dislocation and change of sub-grains before and after the tensile test were investigated byusing scanning electron microscope (SEM) and electron back scattering diffraction (EBSD) technique.The results show that the fracture mechanism of 7075 aluminum alloy was ductile rupture. Thethermal deformation of the 7075 aluminum alloy showed the steady-state flow characteristics, and theflow stress decreased with the increase of deformation temperature. Orientation angle offset of thegrain boundary decreased with the increasing of the deformation at 440 ºC, indicating that thecontinuous dynamic recrystallization occurred inside the 7075 aluminum alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.691.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Study of a Ceramic Thermocouple for Al Production (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 2195-2198 
    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 ceramic thermocouple (CTC) was assembled using SiC as the cathode and MoSi2 as theanode for the temperature test of the aluminum electrolysis. The NiFe2O4 was sprayed on the surfaceof SiC cathode for increasing the corrosion resistance ability in the cryolite. The corrosion behavior ofNiFe2O4 in the cryolite was investigated. The results of the corrosion tests show that the NiFe2O4 hasa very low corrosion rate in the cryolite, and a corrosion layer was formed during the corrosion test.The mechanisms of the NiFe2O4 corrosion are reactive corrosion and particles flaking. The thermoemf of SiC-MoSi2 CTC was tested from 25 ºC to 1300 ºC in air. The results show that thermo emf hasa linear relationship with the temperature dependence, and reached 350 mV at 1300 ºC. The CTCwhich consists of SiC-MoSi2 prepared in the same batch has a preferable interchangeability. Byholding temperature at 1300 ºC, the deviation of thermo emf is 0.5 %, which is better than thecriterion of industry thermocouple, 0.75 %. The CTC response time was also analyzed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.2195.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Through-Thickness Microstructure, Texture and Strength Gradients in AA 7055 Rolled Plate (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 957-960 
    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: Through-thickness microstructure, texture and mechanical property gradients in thelongitudinal section of AA 7055 rolled plate have been investigated using electron back-scattereddiffraction (EBSD) technique. Quantitative analysis of the microstructure and texture through theplate thickness was conducted. It was found that the microstructure and texture are obviouslynon-homogeneous through the plate thickness. From center to surface, more equiaxed grains areobserved. As expected, the degree of recrystallization increases with increasing the S value. Thegrains in the center layer exhibited preferential orientations while the most grains near the surfacepresented a random one. The strength of each observed layer has also been tested
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.957.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Investigation on Dynamic Recrystallization Behavior in Hot Deformed Superalloy Inconel 718 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1297-1300 
    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 nucleation and development of dynamic recrystallization (DRX) in hot deformedsuperalloy Inconel 718 during uniaxial compression were investigated by optical microscopy andelectron back-scattered diffraction (EBSD) technique. The results showed that the discontinuousdynamic recrystallization was the predominant DRX mechanism in this alloy. The variations ofpartial crystallographic orientations led to the individual nucleation inside the deformed grains, whichimplied the occurrence of local continuous dynamic recrystallization. The progressive subgrainrotation can be confirmed neither near the prior high angle grain boundaries nor within the originalgrains. It was found that, as the strain increased, the initial twin boundaries were graduallytransformed to ordinary mobile high angle boundaries. Meanwhile, the new twin boundaries wereformed inside the recrystallized grain necklaces. It was suggested that the characteristics of the twinboundaries evolution with increasing strain were associated with the transformation of initial twinboundaries as well as the generation of new ones, which resulted in the development of DRX
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1297.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Structure and Property of Nickel-Modified Ultrahigh Strength Al-Zn-Mg-Cu Alloy by Spray Forming (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 871-876 
    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: Six kinds of Al-Zn-Mg-Cu alloys, modified with nickel and zirconium, have beenproduced by rapid solidification using spray deposition(the Osprey process). The effect of nickel onthe structures, mechanical properties of ultrahigh strength aluminium alloy is studied, and theprobable maximum of mechanical properties is predicted. There are three nickel-rich phases, Al3Ni2,Al7Cu4Ni and MgNi2, forming in 1%Ni alloy, its ultimate tensile strength(UTS) increased withincreasing extrusion ratios significantly while maintaining high levels of ductility, Futhermore, theextruded bars show enhancing more clearly than extruded plates in UTS and ductility. The content ofNi should decreased with increasing of Zn and Zr, and the highest properties(UTS=832MPa,Elongation=7.5%)are attained in 0.20Zr＋0.30Ni (wt%)alloy. In addition, the size, the shape and thehomogeneous distribution of zirconium-rich phase produced in solidification is the key to effectingthe mechanical properties of materials when Zr content is 0.2~0.5％
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.871.pdf
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