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  • 2005-2009  (11)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Ultra-Fine Grained High Carbon Steel by Innovative Deformation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 550 (July 2007), p. 301-306 
    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: It is well known that the refinement of grain size in metals leads to a significantimprovement in specific mechanical properties. Processing schedules have been investigated aimedat producing an homogeneous ultra-fine ferrite and spheroidised carbide aggregate microstructure inhigh carbon (CMn) steels (0.6-1.2wt%C), via conventional ‘warm’ rolling and innovative EqualChannel Angular Extrusion (ECAE). Suitable deformation schedules were determined fromdilatometry and thermo-mechanical Gleeble simulations. Evidence of an ultra-fine ferrite andcarbide aggregate microstructure following ‘warm’ rolling was observed. A significantimprovement in tensile strength, particularly proof stress was also noted in comparison to materialdeformed at higher temperatures. Concurrent ECAE experiments investigated microstructuralevolution with incremental strain. Extensive analysis was carried out using various techniques,including high resolution Electron Back Scattered Diffraction (EBSD). Evidence of ferrite grainrefinement was noted in a eutectoid composition steel. A sub-micron ferrite structure was observedfollowing high strains (ε~3.33) and the mechanical properties exhibited a marked increase in tensilestrength
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.550.301.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructural Interactions during Stress Ageing a 7475 Aerospace Alloy (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 333-338 
    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: In industrial process, like creep-ageforming, materials are aged under load. To investigatethe influence of an applied stress on the ageing behaviour of Cu bearing Al-7xxx series alloys, a7475 alloy was aged under a constant tensile stress and analysed by means of Small Angle X-rayScattering (SAXS) and TEM. Mechanical testing was also employed, to determine if there was anyeffect on the materials strength. The results show that during the early stages of ageing significantinteractions takes place, which preferentially aligns one type of GP zone, as well as affecting theirsize and volume fraction. During the second stage ageing treatment, the applied stress was observedto cause more rapid over-ageing, by promoting the formation of the η phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.333.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Epitaxial Grain Growth during Surface Modification of Friction Stir Welded Aerospace Alloys by a Pulsed Laser System (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 1169-1174 
    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 liquid film re-growth behaviour resulting from pulsed laser surface melting (LSM)has been investigated for typical 2xxx, and 7xxx aerospace alloys, both on parent plate and frictionstir welded (FSW) joints. In Zr free alloys, as a result of the high growth rate and steep thermalgradient, the melted layer re-grew with a stable front, epitaxially, from the parent subsurface grains.This caused a thin coarse grained solidified layer to form over the parent material, thermomechanicallyaffected zone (TMAZ) and heat affected zone (HAZ), and fine columnar grains todevelop over the FSW nugget zone of the same order in width as the nugget grain size. In the caseof the Zr containing alloys, a very fine columnar grain structure was found over the entire surface,independent of the subsurface grain structure. This has been shown to occur by growth selectionfrom a band of nanoscale Al grains epitaxially nucleated on Al3Zr dispersoids, at the melt solidinterface, that had not fully dissolved in the melt
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1169.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Geometry Effects when Controlling Residual Stresses in Friction Stir Welds by Mechanical Tensioning (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 71-76 
    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: Finite element modelling has proved to be an effective tool for the investigation of trendseffected by changing welding conditions. This is especially important in mechanical tensioning offriction stir welds because of the large number of parameters involved. In this paper, an FE model isused to examine the effectiveness of the mechanical tensioning technique for controlling residualstresses in FSWs by the investigation of trends caused by changes to the welding parameters.Comparisons between different geometries, traverse speeds, and welding off-axis angle all producedconsistent results, and showed that the peak stresses are most strongly influenced by both the localtensioning and heat input, and not by the more global welding conditions. The results also showed aprogressive decrease in the residual stresses for increasing tensioning levels and, although affected by theheat input, a relatively low sensitivity to the welding variables. At tensioning levels greater than ~50% ofthe room temperature yield stress, tensile stresses were replaced by compressive residual stresses withinthe weld
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.71.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Modelling the Precipitation of Al〈sub〉3〈/sub〉X Dispersoids in Aluminium Alloys and their Effect on Recrystallization (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 550 (July 2007), p. 45-54 
    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 combined model is presented that predicts the non-uniform distribution of Al3Xdispersoid particles in commercial aluminium alloys containing zirconium and scandium and usesthese predictions as inputs to a simple recrystallization model. The recrystallization model relies onknowledge of the stored energy in the sub-structure after deformation and this has been measuredusing electron backscattered diffraction (EBSD) techniques. The recrystallization model is based onthe concept that partial recrystallization results from the non-uniform distribution of dispersoidparticles due to their precipitation from a segregated cast structure. The model has been used todevise an improved homogenization treatment for AA7050, which uses an isothermal hold duringheat up to maximize dispersoid nucleation. It has also been applied to predict the effect of scandiumadditions on recrystallization, investigate the factors that control the through thickness variation inrecrystallized fraction, and interpret the results of experiments where the effect of strain rate havebeen studied
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.550.45.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Deformation Processing of Sheet Metals by Continuous Frictional Angular Extrusion (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 550 (July 2007), p. 241-246 
    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 feasibility of a novel continuous severe plastic deformation (SPD) technique,continuous frictional angular extrusion (CFAE), for producing ultra-fine grained strip material, hasbeen studied. The CFAE technique takes advantage of facets of rolling and equal channel angularextrusion (ECAE) and is designed to produce bulk ultra-fine grained (UFG) metals with highproductivity and low cost. A process setup was established through the modification of a standardrolling mill. CFAE processing of commercially pure aluminium AA1050 sheets was successfullycarried out at room temperature, using a 120o die angle. A uniform UFG structure with an averagegrain size of ~0.6μm was achieved after 10 CFAE passes, at an equivalent strain of ~ 6.6. Evolutionof the deformation structure and texture during processing was examined as a function of strain andcharacterized using high resolution EBSD
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.550.241.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Through Thickness Microstructural Gradients in 7475 and 2022 Creep - Ageformed Bend Coupons (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 407-412 
    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: In creep-ageforming a material experiences continuously variable bending stressesthrough its thickness, from tensile to compressive, which are maximum at the surfaces. This canpotentially result in through thickness microstructural gradients, due to interactions between thebending stresses, creep, and precipitation occurring during ageing, that can alter a component’sperformance. The aim of the work reported here was to develop an understanding of these effects inan industrial creep ageforming process. For this purpose two aerospace alloys, 7475 and 2022, wereageformed by Airbus UK using industrial scale ageforming tools. Their microstructures wereanalysed in detail by TEM, and SAXS, which revealed significant through thickness microstructuralchanges after forming
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.407.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Laser and Hybrid Laser-MIG Welding of 6.35 and 12.7mm Thick Aluminium Aerospace Alloy (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 1139-1144 
    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: Fusion welding of 7xxx aluminium alloy plates has been investigated for aerospaceapplications using autogenous laser welding and hybrid laser-MIG welding. Nd:YAG and Yb-fibrelasers have been used, with two different focussed spot sizes in each case. Autogenous and hybridwelding of 12.7mm thick plate using the Yb-fibre laser with a 0.6mm diameter spot was selected forfurther development, on the basis of penetration and weld quality achieved. These welds wereacceptable to the highest quality class B (stringent) of BS EN ISO 13919-2:2001, with a porosity ofonly 0.3% of the cross-sectional area of the weld, and close to class A of AWS D17.1. Transverseproof strengths of ~60% of parent material were achieved. Development of hybrid welding isongoing with novel fillers to refine weld metal grain structure and improve weld properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1139.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Mechanisms of Formation of Submicron Grain Structures by Severe Deformation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 550 (July 2007), p. 159-168 
    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/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.550.159.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    FE Modelling of Mechanical Tensioning for Controlling Residual Stresses in Friction Stir Welds (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 4025-4030 
    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: Although Friction Stir Welding (FSW) avoids many of the problems encountered whenfusion welding high strength Al-alloys, it can still result in substantial residual stresses that have adetrimental impact on service life. An FE model has been developed to investigate the effectives ofthe mechanical tensioning technique for controlling residual stresses in FSWs. The model purelyconsidered the heat input and the mechanical effects of the tool were ignored. Variables, such astensioning level, heat input, and plate geometry, have been studied. Good general agreement wasfound between modelling results and residual stress measurements, justifying the assumption that thestress development is dominated by the thermal field. The results showed a progressive decrease inthe residual stresses for increasing tensioning levels and, although affected by the heat input, arelatively low sensitivity to the welding variables. At tensioning levels greater than ~ 50% of the roomtemperature yield stress, tensile were replaced by compressive residual stresses within the weld
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.4025.pdf
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