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  • 1
    Electronic Resource
    Electronic Resource
    On the Microstructure of HPT Processed Cu under Variation of Deformation Parameters (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 503-504 (Jan. 2006), p. 51-56 
    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 evolution of strength characteristics and the microstructure of copper subjected to high pressure torsion (HPT) are studied under variation of strain and hydrostatic pressure. Measurements of Multiple X-ray Bragg Profile Analysis (MXPA) yield microstructural parameters like dislocation density and arrangement, as well as crystallite (domain) size and distribution, and long-range internal stresses. TEM investigations are carried out to analyse the structural elements and to compare them with the results of MXPA. The strength behaviour is studied by microhardness measurements. The investigations are performed within wide ranges of resolved shear strains ?? = 1 to 400 and of applied pressures p = 0.8 to 8 GPa. The onset of the deformation stages IV and V is strongly affected by the hydrostatic pressure i.e. shifted to higher values of stress and strain with increasing pressure. The experimental results indicate the occurrence of recovery effects, which seem to be of static as well as of dynamic nature, and to be responsible for extended ductility in SPD materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.503-504.51.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    TEM Investigations of Titanium Processed by ECAP Followed by Cold Rolling (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 503-504 (Jan. 2006), p. 805-810 
    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: Conventional coarse grained (CG) commercial pure (CP) Ti Grade 2 was studied after cold rolling (CR) at room temperature, and after equal channel angular pressing (ECAP) at 450° C followed by CR, by transmission electron microscopy (TEM) methods. CR of the CG material leads to a microstructure showing initially twins with (0112) type and later subgrains separated by lowangle grain boundaries. CR carried out after ECAP yields the fragmentation of fine grains (300 – 800 nm) mostly bounded by high-angle boundaries into elongated subgrains (~ 100 nm). It was shown with in-situ annealing experiments in the TEM that this microstructure is thermally stable up to a temperature of 450° C. Tensile tests showed that the combination of ECAP with CR has the potential to produce at the same time high strength (941 MPa) and high ductility (16.7%)
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.503-504.805.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    TEM Study of Local Disordering: A Structural Phase Change Induced by High-Pressure Torsion (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 422-427 
    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: Long-range ordered intermetallic alloys with L12 (Ni3Al, Cu3Au) and B2 (FeAl)structures were deformed by high-pressure torsion at room temperature up to high grades ofdeformation. Transmission electron microscopy shows that disordering caused by the deformationoccurs on a very local scale within coarse grains along glide planes (Cu3Au, Ni3Al) and in the formof well defined local regions (Ni3Al, FeAl). The latter leads to a duplex structure consisting of anordered coarse-grained structure and a disordered nanocrystalline structure. The differentmechanisms that can lead to disordering during severe plastic deformation are discussed on thebasis of the different ordering energies and on the basis of antiphase boundaries associated withgliding dislocations. The results indicate that in intermetallic alloys the formation of ananocrystalline structure by severe plastic deformation is facilitated by the loss of order
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.422.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    High Pressure Torsion of Intermetallic Zr〈sub〉3〈/sub〉Al (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 553-558 
    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 L12-structured intermetallic compound Zr3Al can be rendered amorphous easily byseveral techniques. In the present study the structural evolution during high pressure torsion (HPT)was investigated systematically by transmission electron microscopy (TEM) methods. Zr3Alsamples were deformed at room temperature to different grades of deformation up to shear strainsof 140 000%. TEM investigations revealed that the tendency to grain fragmentation, disorderingand the formation of a nanocrystalline structure is weak compared to other L12 ordered alloys likeNi3Al. In addition, an amorphous phase has not been encountered. The present results differstrongly from previous ones obtained from ball-milled materials. Possible reasons for the differentbehavior are discussed on the basis of the temperature dependent dissociation scheme of thesuperlattice dislocations gliding in Zr3Al
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.553.pdf
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    Paper (German National Licenses)
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