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  • 2005-2009  (10)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Process Modelling of Friction Stir Welding for Aerospace Aluminium Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 351-356 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.351.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Modelling Dispersoid Precipitation in Scandium Containing Aluminium Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 386-391 
    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/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.386.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    The Microstructures of As-Cast Mg-Zr and Mg-Mn Alloys (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 329-332 
    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 as-cast microstructures of two dilute Mg-Zr and three dilute Mg-Mn alloys werestudied using optical microscopy and scanning electron microscopy, including EDX analysis. The results show that the as-cast microstructure of the Mg-Zr alloys was composed of non-dendritic, equiaxed Mg grains, with a few Zr particles within the Mg grains and along grain boundaries. The grain size of the Mg-Zr alloy was significantly reduced by the Zr addition and a fine grain structure was achieved when the zirconium concentration was above 0.4wt. %. The as-cast structure of theMg- Mn alloys contained columnar, dendritic grains. Two types of Mn particles (equiaxed large particles and rod-like or plate-like small particles) were observed in the as-cast Mg-Mn alloys. The volume fraction of particles and the size differences between the large and small particles increased with an increase of Mn concentration
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.329.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Modelling Precipitate Evolution during Friction Stir Welding of Aerospace Aluminium Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 1101-1106 
    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: Two models to predict the microstructural evolution and post-weld properties offriction stir welds in aerospace aluminium alloys are presented. The first model is a develop-ment of an existing semi-empirical method for the prediction of hardness profiles after welding,calibrated using isothermal hardness data. Post-weld natural ageing is accounted for, and anew method that predicts natural ageing kinetics is introduced. Once calibrated, the modelis shown to accurately predict weld hardness profiles. However, this model does not explicitlypredict the microstructure and therefore cannot readily be extended to model other properties.It can also only be applied to alloys welded in peak or overaged conditions. The second modelaims to explicitly predict the heterogeneous precipitate distributions obtained after weldingfor any initial condition. It is based on classical kinetic theory and the numerical frameworkof Kampmann and Wagner. Multiple nucleation sites and multiple phases are accounted for.This model provides detailed microstructural information required for prediction of complexproperties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1101.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Modelling Heterogeneous Precipitation in 7xxx Aluminium Alloys during Complex Processing (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 1435-1440 
    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 numerical model based on the Kampmann and Wagner method wasdeveloped to predict the evolution of precipitate distribution in 7xxx aluminium alloyduring non-isothermal heat treatments. The model considers the nucleation, growthand coarsening/dissolution of the metastable and equilibrium precipitate phases, η'and η with their stochiometric composition, MgZn2. Constitutive model equations fornucleation were based on the classical theory of nucleation whilst growth andcoarsening were treated using classical phase transformation theory. The transitionbetween η' and η, where η' acts as a precursor for η was also accounted for in themodel. Differential scanning calorimetry was used to calibrate the homogeneousprecipitation kinetics. The model also predicts the evolution of grain boundaryprecipitates and their effect on precipitate free zone size. Jominy end quench testswere performed to calibrate grain boundary precipitation kinetics. Precipitation ondislocations and dispersoids was considered. The dislocation and dispersoid densitieswere varied to represent different regions of a grain and therefore account for thespatial distribution of preferential heterogeneous precipitation sites. Comparisonbetween the model prediction and experimental characterisation of the microstructureevolution of a friction stir welded 7449 aluminium alloy was found to be reasonablyconsistent
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1435.pdf
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Evolution of Texture in Zirconium Alloy Tubing during Processing (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 495-497 (Sept. 2005), p. 675-680 
    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: Electron backscattered diffraction (EBSD) has been used to determine microtexture in a zirconium alloy tube subject to interrupted pilgering and therefore exhibiting varying amounts of deformation as a function of axial position along the transition between the initial and final size. Texture and hardness measurements have been made as a function of the distance through the tube wall thickness and along the tube length. Texture results have been compared with co-located hardnessmeasurements. The results show a systematic variation in the deformation texture with changes in Q (the ratio of the reduction in thickness to reduction in diameter). This is consistent with previous observations of the effect of Q on texture evolution in zirconium alloys. It is demonstrated that the texture measurements can be correlated well with the anisotropy in strength determined fromhardness measurements
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.495-497.675.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Coherency Loss of Al〈sub〉3〈/sub〉Sc Precipitates during Ageing of Dilute Al-Sc Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 473-478 
    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: Scandium additions are known to offer a number of benefits to aluminium alloyperformance. Many of these benefits can be attributed to the precipitation of fine Al3Sc particles.These particles are fully coherent with the aluminium matrix when they are small, but can losecoherency as they grow or coarsen. In this work, the change in coherency has been studied in an Al-0.12 wt%Sc alloy over the temperature range 300-425oC. Three coherency regimes were identified,consistent with previous observations. The time and temperature range over which coherencychanges occur have been measured for a range of conditions and correlated with the precipitationkinetics and the predictions of a model for Al3Sc precipitation. The effect of the coherency changeon the particle morphology has also been investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.473.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Microstructural Evolution in AA7449 Plate Subject to Friction Stir Welding and Post Weld Heat Treatment (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 1181-1186 
    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 friction stir welding (FSW) and post weld heat treatment (PWHT)on the second phase particle distribution and cross weld hardness profile in AA7449 plate hasbeen investigated. The alloy was received in an underaged condition, welded, then PWHT togive an overaged condition (in the parent material) . The effect of this complex treatment onthe precipitate distribution in the weld and parent plate has been investigated over a rangeof length scales using small angle X-ray scattering (SAXS), TEM and FEGSEM. It is shownthat the PWHT does not improve the hardness in the heat affected zone (HAZ), which is thelocation of the strength minimum after welding, but it does reduce the difference between thehardness in the HAZ and the nugget and parent hardness. The reduction in nugget strengthafter PWHT is particularly marked and is due to replacement of fine GP zones formed on postweld natural ageing by coarse overaged precipitates
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1181.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Investigation on Microstructures of Heat Treated Mg-Zr and Mg-Mn Alloys (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 189-192 
    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 microstructure of three dilute Mg-Mn and two dilute Mg-Zr alloys which had beenheat treated at different temperatures and times were studied using optical microscopy and various electron optical techniques, including FEGSEM and TEM. It was found that the Mg-Zr alloys homogenized at 500℃ and annealed at 350℃ contained a fine dispersion of Zr-containing particles at grain boundaries and within grains. In contrast, annealing Mg-Zr alloys at 300℃ for up to 3 h led to little modification of the as-cast structures. When the Mn content was less than 0.9 weightpercent, homogenization of the Mg-Mn alloys at 550 to 600℃ resulted in the dissolution of small rod-like and needle-shape particles, which then grown up as fine particles when aged at 300℃. Mg- 0.6Mn and Mg-0.9Mn alloys annealed at 300 to 400℃ without solution treatment contained a large volume fraction of nano-sized precipitates
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.189.pdf
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