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  • 1
    Electronic Resource
    Electronic Resource
    Difference in Annealing Characteristics of Nanostructured Copper Alloys Processed by Accumulative Roll Bonding (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1373-1376 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The difference in annealing characteristics of oxygen free copper (OFC) anddeoxidized low-phosphorous copper (DLP) processed by ARB was studied. The copper alloysprocessed by eight cycles of the ARB were annealed for 10 minutes at various temperaturesranging from 100 to 400°C. The variation of microstructure and mechanical properties withannealing was significantly different in both copper alloys. In case of OFC, the ultrafine grained(UFG) structure formed by the ARB still remained up to 200°C, and above 200°C it wascompletely replaced with a coarse grained structure due to an occurrence of the conventionalrecrystallization. However, in case of DLP, the recrystallization did not occur even at 350°C.The strength of the OFC also decreased significantly at annealing temperatures above 200°C,while the hardness of the DLP did not decrease so largely up to 350°C. These differences inannealing characteristics in both copper alloys were discussed in terms of purity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1373.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructure Evolution and Hardening Behavior of 2024 Aluminum Alloy Processed by the Severe Plastic Deformation (2002)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 396-402 (July 2002), p. 1163-1168 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/06/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.396-402.1163.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Stacking Layer Number on Mechanical Properties of Accumulative Roll Bonding Processed Aluminum (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 161-164 
    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 and six-layer stack accumulative roll bonding (ARB) processes were applied to commercial purity aluminum in order to investigate the effect of the stacking layer number on the mechanical properties. The initial thickness of the aluminum sheets for two and six-layer stack ARB was 1mm and 0.5mm, respectively. Two-layer stack ARB was performed by 50% reduction per cycle. For six-layer stack ARB, the six aluminum sheets were first stacked together and cold-roll-bonded by 50% reduction rolling, and then followed by four-pass rolling so that the final thickness was 0.5mm. The sheet was then cut to the six pieces of same length and the same procedure was repeated to the sheets. The tensile strength of the ARB processed specimens increases with the number of ARB cycles in both two and six layer stack ARB. Thetensile strength is lower by the six-layer stack ARB than that by the two-layer stack ARB. The elongation slightly decreases with the number of the ARB cycles, regardless of the stacking layer number. TEM observation reveals that the grain size of the six-layer stack ARB is larger than that of the two-layer stack ARB. The effects of the number of the layers in stacking are explained by the redundant shear deformation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.161.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Grain Refinement of Copper Alloys by Equal Channel Angular Pressing (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 177-180 
    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 equal channel angular pressing (ECAP) is one of the methods to refine the grain size of metallic materials. This study investigates the effect of ECAP process on the formation of the fine grain size in oxygen free Cu and Cu alloys. The average grain size has been refined from 150 µm before ECAP to 300 nm. Microstructure was analyzed by transmission electron micrography (TEM). The diffraction pattern of the selected area confirmed the formation of ultrafine-grained structure withhigh angle grain boundaries after 8 cycles of ECAP. Mechanical properties such as microhardness and tensile properties of the ultra-fine grained copper materials have been investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.177.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Fabrication of High Mg Containing Al-Mg Alloy Sheets by Twin Roll Strip Casting (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 29-30 (Nov. 2007), p. 83-86 
    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: Al-Mg alloy sheets with high Mg contents (3~10wt%Mg) were fabricated by twin roll stripcasting. The optimum process conditions to get a good surface quality of Al-Mg strip have beensuggested in this experiment. Controlling the cooling rate of cast roll was important to improve thesurface quality of the strip and a compositional homogeneity through the thickness. The size ofintermetallic particle like Al-Fe compound was reduced down to 1~2μm due to a high cooling rate ofAl melt during strip casting. In addition, the dendrite structure was fine and the segregation of Al8Mg5phase between grains was remarkably reduced. Therefore, the strips with a thickness of 3mm havegood workability during additional hot/warm rolling processes. The hot/warm rolled Al-5wt%Mgsheets show high strength and elongation. When the rolled sheets were annealed at 300 oC for 1hr., thetensile strength and total elongation of the sheets reached at 290 MPa and 30%, respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.83.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Tensile Properties and Fatigue Strength of Ultrafine Grained Pure Copper (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1649-1652 
    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: Oxygen-free copper was processed by equal channel angular pressing with differentnumbers of ECAP process cycles, NP. Tensile strength was increased with an increase in NP, but ittended to saturate after NP = 4. Conversely, elongation was dramatically decreased by first pressing,but it tended to saturate up to NP = 3, followed by slight increasing trend after NP = 4. Fatigue tests ofspecimens processed with NP = 4 and 8 were performed. The change in surface morphologies duringfatigue was monitored successively. In addition to this, the change in surface hardness was measured.Significant decrease in surface hardness due to cyclic stresses was measured. The physical basis offatigue damage of UFG copper was discussed based on the experimental results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1649.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Nano-Structured High Purity Copper Processed by Accumulative Roll-Bonding (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 239-242 
    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: Accumulative roll-bonding (ARB) process was applied to an oxygen free copper forimprovement of the mechanical properties via ultra grain refinement to nanometer order level.Two copper sheets 1mm thick, 30mm wide and 300mm long are degreased and wire-brushed forsound bonding. The sheets are then stacked to each other, and cold-roll-bonded by 50%reduction rolling. The sheet is then cut to the two pieces of same length and the same procedurewas repeated to the sheets. The ARB process up to eight cycles (an equivalent thickness strain of6.4) is successfully performed at ambient temperature. TEM observation reveals that ultrafinegrains, hardly containing the dislocation interior, begin to develop at the third cycle, and afterthe sixth cycle they cover most of regions of samples. The morphology of ultrafine grainsformed is different from that of aluminum alloys. Tensile strength of the ARB-processed copperincreases with the equivalent strain up to a strain of ~3.2, in which it reached 390 MPa, ~2.1times higher than the initial value. However, the strength hardly changed at the strain above ~3.2
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.239.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of Strain Rate on Microstructural Evolution of Nano-Grained Copper in Accumulative Roll-Bonding Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 71-74 
    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 strain rate in rolling on microstructures and mechanical properties of anano-grained high purity copper processed by accumulative roll bonding (ARB) were studied. Therolling during ARB was conducted with two kinds of strain rates (2.6sec-1 and 37sec-1). Themicrostructural evolution of the copper with ARB proceeding was somewhat different in bothmethods. However, the variation of mechanical properties with ARB was very similar to each other
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.71.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Microstructural Characteristics of Cu-Fe-P Alloys Severely Deformed by Accumulative Roll Bonding Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 2849-2852 
    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 accumulative roll bonding (ARB) process is one of the methods to refine the grainsize of metallic materials. The ARB process up to 8 cycles was performed for the pure Cu and Cu-Fe-P (PMC-90) alloy at ambient temperature under no lubricant conditions. In the pure Cu, thenano-sized grains were formed after third cycle with an average grain size of 200nm. Once the 200nm grains formed, further reduction in the grain size was not observed up to the 8 ARB processcycles. On the other hand, the formation of the stable nano-sized grains in PMC-90 alloy wasretarded compared to the pure Cu due to the alloying elements. For both alloys, the tensile strengthvalues increased drastically in the initial stage of ARB process. The tensile strength values of bothalloys tended to saturate after the third ARB process cycle. The tensile elongation value greatlydecreased by 1 cycle of ARB process due to the strain hardening. After the third cycle of ARBprocess, each alloy showed a gradual increase in tensile elongation due to the dynamic recovery.For PMC-90 alloy, the strength value is higher than that of OFC due to addition of the alloyingelements
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2849.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Deformation Behavior of Functionally Graded Ti-Ni Shape Memory Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 211-214 
    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: Deformation behavior of temperature gradient anneal(TGA) treated Ti-50.0Ni(at%)alloys were investigated by means of thermal cycling tests under constant load and tensile tests.TGA treated Ti-Ni alloy wires showed a sequential deformation behavior along the length of thespecimen since the stress required for the B2-B19’ transformation increased with decreasingannealing temperature. Considerably large residual elongation(about 0.4 %) occurred in the TGAtreated Ti-Ni alloy under the applied stress of 80 MPa, which is ascribed to the fact that yield stressof the sample annealed at 823 K is lower than the stress required for the B2-B19’ transformation ofthe sample annealed at 658 K
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.211.pdf
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