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  • 1
    Electronic Resource
    Electronic Resource
    Grain Size Saturation during Severe Plastic Deformation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 2837-2842 
    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: Ultra-low carbon steel (ferritic steel), commercial purity aluminum and high purity copperwere heavily deformed by the accumulative roll bonding (ARB) process, and the microstructuralevolution during the ARB was analyzed. Significant grain refinement by grain subdivisionmechanism was confirmed in all three kinds of materials. On the other hand, microstructurerefinement slowed down with increasing strain and the grain size stayed in nearly a constant value inthe ultrahigh strain region. The mechanism of the grain size saturation was discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2837.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties of Al-0.5 at.% X (=Si, Ag, Mg) Alloys Highly Deformed by ARB Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 547-552 
    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: Effect of solid solution elements on microstructure evolution and mechanical propertieswas investigated using a high purity Al (purity 99.99%) and Al-0.5 at.% X ( X = Si, Ag, Mg ) alloysdeformed by accumulative roll bonding (ARB) process up to 7 cycles (equivalent strain of 5.6) atambient temperature. The ARB-processed high purity Al showed the equiaxed microstructure havingmean grain size of 750 nm. On the other hand, the microstructure of the ARB-processed Al-0.5at.%Xalloys showed lamellar boundary structures elongated along RD. The mean lamellar boundaryspacing significantly differed depending on the alloying elements, which suggested that solute atomshad a significant effect on microstructure evolution. The difference in the grain size was regarded tobe caused by the difference in recovery processes in the alloys. The tensile strength of the alloysincreased with increasing the number of ARB cycles. In the Al-Si and Al-Ag alloys, the post-uniformelongation increased with increasing the number of the ARB cycles. On the other hand, the elongationof the Al-Mg hardly changed during the ARB process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.547.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    EBSD and TEM Characterization of Ultrafine Grained High Purity Aluminum Produced by Accumulative Roll-Bonding (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 512 (Apr. 2006), p. 91-96 
    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: High purity aluminum (99.99% purity) was severely deformed by accumulativeroll-bonding (ARB) to a thickness reduction of 98.4%. Quantitative microstructural characterization of the deformed sample was carried out by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). EBSD scans at various locations from the sample surface to the mid-thickness revealed a fairly uniform and equiaxed structure, although a small fraction of an elongated structure parallel to rolling direction (RD) was also observed. Misorientation angledistributions for grain boundaries of which misorientation angle was larger than 2° were evaluated by EBSD, showing that more than 70% of the boundaries were high-angle ones (〉15°). More detailed structural features, such as low-angle boundaries (〈2°) and dislocations between boundaries were characterized by TEM. The TEM results indicated that about 17% of the boundaries havemisorientations 〈2° and that the fraction of high-angle boundaries is about 52%. An estimated yield strength based on the structural parameters determined by TEM was in good agreement with the measured value
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.512.91.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties of Nanostructured Metals Produced by High Strain Deformation (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 579 (Apr. 2008), p. 135-146 
    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 structures produced by high pressure torsion (HPT) and accumulativeroll-bonding (ARB) were characterized by transmission electron microscopy and electron backscatterdiffraction, and the mechanical properties of the ARB samples were determined by uniaxial tensiletesting. The structural evolution during HPT in high purity nickel has been examined and an extendedlamellar boundary structure was observed at high strains. For ARB samples deformed to high strains,an almost similar structural morphology has been observed in both interstitial free steel and incommercial purity aluminum, whereas a relatively equiaxed structural morphology was observed inhigh purity aluminum samples. In all samples, both deformed by HPT and ARB, the deformationstructures were composed of a large fraction of high-angle boundaries, together with low-angleboundaries and isolated dislocations between the boundaries. Common characteristics have beenidentified in the mechanical behavior of the ARB samples, namely a very high strength, a smalluniform elongation and a relatively large post-uniform elongation after necking. For HPT and ARBthe structural morphology and structural parameters are compared, and for the ARB samplesstructure-property relationships are also discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.579.135.pdf
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Strain on Deformation Microstructure and Subsequent Annealing Behavior of IF Steel Heavily Deformed by ARB Process (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 467-470 (Oct. 2004), p. 341-348 
    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: Ultra low-carbon interstitial free (IF) steel having ferrite (b.c.c.) single phase was deformed to various equivalent strains ranging from 0.8 to 5.6 by the accumulative roll bonding (ARB) process at 500°C. The microstructure and crystallographic feature of the deformed specimens were characterized mainly by FE-SEM/EBSD analysis. Grain subdivision during the plastic deformation up to very high strain was clarified quantitatively. After heavy deformation above 4.0 of strain, the specimens showed the lamellar boundary structure uniformly, in which the mean spacing of the lamellar boundaries was about 200nm and more than 80% of the boundaries were high-angle ones. Annealing behavior of the ARB processed IF steel strongly depended on the strain. The specimens deformed to medium strains exhibited discontinuous recrystallization characterized by nucleation and growth, while the specimens deformed above strain of 4.0 showed continuous recrystallization. The recrystallization behaviors are discussed on the basis of themicrostructural and crystallographic parameters quantitatively measured in the as-deformed samples
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.467-470.341.pdf
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