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  • 1
    Electronic Resource
    Electronic Resource
    Strengthening of Nickel Deformed by High Pressure Torsion (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 417-421 
    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 strength of a deformed metal depends on the content of high angle boundaries, lowangle dislocation boundaries and the dislocations between the boundaries. High angle boundariescontribute by Hall-Petch strengthening, whereas for the low angle dislocation boundaries anddislocations between boundaries the strengthening is proportional to the square root of the dislocationdensity. Based on an assumption of additivity of these contributions, the flow stresses of metalsdeformed by cold rolling have been calculated successfully. In the present investigation pure Ni(99.9%) has been deformed by high pressure torsion (HPT) to von Mises strains of 0.9, 1.7, 8.7 and 12.The strength of the HPT Ni has been determined by Vickers microhardness (HV) measurements andthe microstructural parameters have been determined by transmission electron microscope (TEM) inthe longitudinal section. HPT has been compared with deformation by cold rolling and torsion basedon the structural evolution with strain and the stress-structure relationship. Based on an assumption ofa linear additivity of boundary strengthening and dislocation strengthening, good agreement has beenfound between the calculated and the experimental flow stress
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.417.pdf
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Temperature Effect on Hydrogen Generation by the Reaction of γ-Al2O3-Modified Al Powder with Distilled Water (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The effect of temperature on the reaction of γ-Al2O3-modified Al powders with distilled water was investigated. It was found that by increasing the temperature up to 40°C, the hydrogen generation speed can be enhanced one to two orders of magnitude relative to that at room temperature (18°C). X-ray analyses and transmission electron microscopy observations revealed that the reaction by-product at 40°C is bayerite (Al(OH)3), which is chemically neutral. The present results imply that slightly increasing the temperature is an effective way to get the target hydrogen generation speed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00534.x
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