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  • 1
    Electronic Resource
    Electronic Resource
    Influence of an Incremental Deformation on Material Behaviour and Forming Limit of Aluminium Al99,5 and QT-Steel 42CrMo4 (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 6-8 (May 2005), p. 417-424 
    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: By cyclic torsion tests on thin walled tubular specimens the influence of a resulting strain increment per cycle on the plastic flow behaviour of Al99,5 and normalised QT-steel 42CrMo4 has been investigated. Thereby large shear amplitudes were chosen and the amount of forward and backward shear was varied. In both materials with increasing portion of backward shear a transition from cyclic hardening to cyclic softening was observed. It has been demonstrated that a certain ratio of forward and backward shear can cause a rise of the forming limit, which can exceed by far the value for monotonic deformation. The mechanical behaviour under cyclic incremental deformation is associated with certain substructure evolution. In dependency on deformation parameters especially the formation of dislocation cells and subgrains has been observed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.6-8.417.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Combining Equal-Channel Angular Extrusion (ECAE) and Heat Treatment for Achieving High Strength and Moderate Ductility in an Al-Cu Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 685-690 
    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 effect of equal-channel angular extrusion (ECAE) on mechanical properties of anAA2017 produced by powder metallurgy is investigated. Special attention is given to the influenceof heat treatment, processing temperature and backpressure on the workability for achieving highstrength and moderate ductility. This is of special interest, since it is often reported that Al-Cualloys have low ductility and therefore are prone to cracking during severe plastic deformation. It isshown that ECAE at high temperatures (〉220°C) does not necessitate backpressure to ensurehomogeneous deformation but leads to a significant sacrifice in strength due to in-situ precipitation.Thus, most of the extrusions are done at considerably low temperatures. Performing roomtemperature-extrusion is most effective in achieving high strengths but also requires highbackpressures. Due to severe strain hardening during processing, the strength increase is combinedwith a reduction in ductility. Recently it was reported that a post-ECAE aging of pre-ECAE solutiontreated material is effective in enhancing the ductility of aluminium alloys. This approach wassuccessfully transferred to the current alloy. A high-temperature, short-time aging after only oneextrusion, for example, doubles the failure strain to a value of ~13%. Compared to the naturallyaged condition with coarse grains that serves as reference (T4), an increase of 15 % in yield stress(YS) was obtained while retaining the ultimate tensile stress (UTS). Another effective approach isthe combination of a pre-ECAE solution treatment with subsequent under-aging prior to ECAE. It isshown that performing ECAE at medium temperatures (160-180°C) enables a better workability andadditionally gives higher strengths and better ductility compared to the processing in the waterquenched condition. A remarkable YS of 530 MPa and an UTS of 580 MPa combined with amoderate failure strain of 11.6 % were achieved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.685.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties Affecting Crack Growth Behaviour in AA6060 Produced by Equal-Channel Angular Extrusion (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 815-820 
    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: Crack growth in AA6060 after two and eight equal-channel angular extrusions (ECAE),showing a bimodal microstructure and a homogenous ultrafine-grained microstructure, respectively,are compared to the coarse grained counterpart. Furthermore, an optimized condition, obtained bycombining one ECA-extrusion and a subsequent short aging treatment is included. Fatigue crackgrowth behaviour in the near-threshold regime and the region of stable crack growth is investigatedand related to microstructural features such as grain size, grain size distribution, grain boundarycharacteristics and ductility. Micrographs of crack propagation surfaces reveal information on crackpropagation features such as crack path deflection and give an insight to the underlyingmicrostructure. Instrumented Charpy impact tests are performed to investigate crack initiation andpropagation under impact conditions. Due to the recovery of ductility during the post-ECAE heattreatment, the optimized condition shows improved fatigue crack properties and higher energyconsumption in Charpy impact tests, when compared to the as-processed conditions without heattreatment
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.815.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Ultimate Strength of a Tungsten Heavy Alloy after Severe Plastic Deformation at Quasi-Static and Dynamic Loading (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 405-410 
    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 tungsten heavy alloy (92%W, Ni-Co matrix) is subjected to severe plastic deformation(SPD) by high pressure torsion (HPT) at room temperature up to equivalent strains of 0.7, 5.3, 10.7and 14.3. The microstructure and the mechanical properties are investigated by cylindricalcompression samples at quasi-static and dynamic loading. The harder spherical W particles arehomogeneously deformed within the softer matrix, becoming ellipsoidal at medium strains andbanded at high strains without shear localization or fracture. Results of quasi-static loading showthat the strength is approaching a limiting value at strains of ~10. At this strain for the matrix a grainsize of ~80 nm and for W a cell size of ~250 nm was observed, suggesting strain concentration onthe matrix. The initial yield stress of 945 MPa for the coarse-grained condition is increased therebyto an ultimate value of 3500 MPa, while a peak stress of ~3600 MPa is reached. Such remarkablystrength has never been reported before for pure W or W-based composites. The strain hardeningcapacity as well as the strain rate sensitivity is reduced drastically, promoting the early formation of(adiabatic) shear bands
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.405.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Evolution of Microstrains at Cyclic Incremental Deformation of Steel 42CrMo4 (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 925-930 
    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: X-ray diffraction line profiles of a ferritic-pearlitic steel at different stages ofmonotonic and cyclic incremental strain paths were recorded and peak broadening wasregarded. Evaluation of integral peak widths shows, that the distortion of structure is stronglydependent on the deformation path. The results for peak broadening at different deformationstates correlate with flow stress behaviour and can be explained with certain dislocationarrangements
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.925.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Relation Between Fountain Pressure and Heat Current in Helium II (1948)
    [s.l.] : Nature Publishing Group
    Nature 162 (1948), S. 67-68 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Allen and Reekie1 directed attention to the fact that the fountain-pressure difference ΔP at the ends of a narrow slit or capillary produced by a temperature difference is, in the absence of mass flow, exactly proportional to the heat current W appearing simultaneously with the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/162067b0
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Aetiologie der Tabes (1881)
    Springer
    European archives of psychiatry and clinical neuroscience 11 (1881), S. 252-253 
    Details
    ISSN: 1433-8491
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02054833
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Statistisches aus der städtischen Frauen-Siechenanstalt (1879)
    Springer
    Virchows Archiv 76 (1879), S. 542-545 
    Details
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01877906
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Empfänglichkeit Neugeborener für das Pockencontagium (1880)
    Springer
    Virchows Archiv 79 (1880), S. 43-48 
    Details
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01877572
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  • 10
    Electronic Resource
    Electronic Resource
    Die Kost in der städtischen Frauen-Siechenanstalt (Berlin) (1881)
    Springer
    Virchows Archiv 84 (1881), S. 155-163 
    Details
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01935474
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