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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
    Study on Cavity Growth in Uniaxial Tension of ZK60 Magnesium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 687-690 
    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: Cavity growth is a typical microstructure feature in superplastic forming (SPF) ofmaterials. Substantial growth and interlink of cavities in superplastic deformation usually lead toreduction in elongation, even to failure. Consequently, it is necessary to investigate themechanism and model of cavity growth. In this paper, experimental studies on cavity growth werecarried out by means of superplastic tension of ZK60 magnesium alloys. Scanning electronicmicroscope (SEM) was employed for observation of fractography. Experimental cavity radius andvolume fraction were determined by optical microscopy and corresponding picture-based analysissoftware. It is found that, the fractured surfaces after a superplastic elongation have a mixedcharacteristic of intergranular cavities and dimples. Further, the cavity growth is identified to followa exponentially increasing mode
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.687.pdf
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Microstructure and Thermal Stability of Al-Mg-Mn Alloys by Equal Channel Angular Pressing at Elevated Temperature (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 929-932 
    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: Two Al-Mg-Mn alloys having similar compositions but with and without Zr addition weresubjected to equal channel angular pressing (ECAP) at 350℃ using route BC and a 90° die, followedby water quenching or air cooling. A series of annealing experiments were conducted at varioustemperatures from 400℃ to 460℃ on the water-quenched alloys. Fine structures with grain size ofapproximately 1~2μm were obtained in these alloys after 6 passes. The water-quenched alloycontaining Zr exhibited finer structure compared with the Zr-free alloy in the same cooling condition,which was due to the existence of Al3Zr dispersoids. And in the air cooling condition, it was foundthat in the Zr-free alloy static recovery occurred, and in partial regions some small grains withoutdislocation inside appeared suggesting the occurrence of static recrystallization. This demonstrated afairly restored structure. However, the microstructure of the alloy containing Zr kept stable during theair cooling process. In addition, in the annealing experiments, secondary recrystallization took placein the Zr-free alloy annealed at 410℃ for 1h, while the alloy containing Zr kept stable up to 460℃.TEM observation showed that the Al3Zr dispersoids pinned the motion of the grain boundaries,thereby the secondary recrystallization and grain growth were inhibited
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.929.pdf
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Interface Behavior in Liquid Phase Impact Diffusion Welding of Aluminum Matrix Composite (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 502 (Dec. 2005), p. 449-454 
    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: In this paper, the interface behavior in Liquid Phase Impact Diffusion Welding (LPIDW) of Aluminum Matrix Composite has been studied. Results show that by LPI diffusion welding, the interface state between reinforcement (SiC particle) and matrix is prominent, the harmful microstructure or brittle phase can be restrained from the welded joint. Moreover, dislocation density in both matrix and interface are higher than that of parent composite, the dislocation entwists each other intensively resulted in welding the composite successfully
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.502.449.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Microstructure of Brazing Joint of Silicon Nitride (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 4048-4052 
    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: Si3N4 and 40CrMo steel was joined using Ag-Cu-Ti-Pd brazing filler. Microstructure ofthe joint and bonding interface was studied by SEM and EDS, and the phase structure was analyzedby XRD. The results indicate that reaction layers at ceramic/ filler alloy and filler alloy/steelinterfaces are formed. There is a reaction layer containing TiN and Ti5Si3 between ceramic and filleralloy, while the reaction layer between filler alloy and steel is composed of Fe-Ti compound. Themiddle part of the joint is an eutectic structure composed of Ag-riched and Cu-riched solid solutions.With the increase of the brazing temperature, the thickness of the joint seem decrease, the thickness ofthe reaction layer between Si3N4 and filler alloy increases and then decreases, and the thickness ofthe reaction layer between filler alloy and steel increases
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.4048.pdf
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