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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 503-504 (Jan. 2006), p. 721-726 
    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
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 705-710 
    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 influence of microstructure on the electrochemical properties of an Al-5 wt% Cu binary alloywhich was severely deformed by equal-channel angular pressing (ECAP) has been investigated in aborate-boric acid buffer solution containing Cl¯ ions at pH 8.3 and 25°C by potentiodynamic polarization test.The anodic polarization results showed that pitting potentials of ECAPed Al-Cu alloy samples were higherthan that of the sample without ECAP and increased with repetitive ECAP passes. The pitting corrosionattack of Al-Cu alloy samples took place in the surroundings of Al2Cu (θ) phase. It is considered that thegrain refinement of θ phase and the solid solution generated in Al matrix during ECAP process areresponsible for the improvement of the corrosion resistance of ECAPed Al-Cu alloy
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 2155-2161 
    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 new method for evaluating the hydrogen embrittlement (HE) susceptibility of ultra highstrength steel was studied in order to propose a new method for assessing the delayed fractureproperty. The material used was 1400MPa tempered martensitic steel with the chemical composition0.40C-0.24Si-0.81Mn-1.03Cr-0.16Mo(mass%). The local approach originally used for evaluating thebrittle fracture property was applied to HE susceptibility assessment after modifying the method toinclude the effect of hydrogen content. Critical HE data used in the modified local approach wasobtained by a stepwise test in which alternating processes of stress increase and stress holding wererepeated until the specimen fractured. The specimen used in the stepwise test was 10 mm in diameterand the stress concentration factor was 4.9. Assessment of HE susceptibility for specimens with otherdimensions entailed the use of a critical hydrogen content for failure, Hc, representing the maximumhydrogen content among the unfractured specimens in the HE test with constant loading. Matters tobe noted for obtaining the material parameters are discussed
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 4807-4812 
    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: This study aims to shorten the softening treatment period as possible in high strength structural steels. The steelused is SCM440 steel. As an initial microstructure, martensite, bainite, pearlite and complicated microstructureconsisting of ultrafine polygonal, martensite and equiaxed cementite were extensively examined to understandtheir softening process on aging at 973K. These initial microstructures were prepared by heat orthermomechanical treatment. Their initial Vickers hardness (Hv(10kgf)) were 634, 281, 219 and 238,respectively. It is noteworthy that within five minutes on aging hardness of the complicated microstructurereached lower than Hv200, while it took more than several hours for other initial microstructures. Aquantitative evaluation of microstructures appears to help in understanding the mechanism of the softeningkinetics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 558-559 (Oct. 2007), p. 873-878 
    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: Compression tests were performed on Fe-3%Si specimens with few grains. The deformationmicrostructure and microtexture were investigated by electron backscatter diffraction (EBSD)and related to the initial crystal orientation and grain boundary characteristics. Groups of microbandswere found that are characterised by a periodic change in crystal orientation, shear at thegrain boundary, and the formation of new grains. It is supposed that these microband groups representan early stage of microshear band development
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 558-559 (Oct. 2007), p. 569-574 
    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: Microstructural evolution taking place during equal channel angular pressing (ECAP) wasstudied in a commercial coarse-grained Al-6%Mg-0.4%Mn-0.3%Sc alloy at a temperature of 300oC(~0.6Tm). Samples were pressed using route A to a total strain of 12 and quenched in water after eachECAP pass. ECAP at moderate-to-high strains leads to the formation of a bimodal grain structure withgrain sizes of around 1 and 8 μm and volume fractions of 0.3 and 0.6, respectively. The development ofnew-grained regions has been shown to result from a concurrent operation of continuous dynamicrecrystallization that occurs during deformation and static recrystallization that occurs during each ECAPcycle by the exposure of the as-deformed material in the die kept at 300oC for around 1.5 minutes. Themicrostructural development during warm-to-hot ECAP is discussed in terms of the enhanced drivingforce for recrystallization, resulting from the evolution of high-density dislocation substructures due to thelocalization of plastic flow and inhibition of recovery in the present alloy
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 512 (Apr. 2006), p. 55-60 
    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: We examine the hydrogen embrittlement susceptibility of a high-strength AISI 4135 steel by means of a slow strain-rate test (SSRT) using notched round bar specimens. Hydrogen was introduced into the specimens by electrochemical charging and its content was measured by thermal desorption spectrometry (TDS). It was found that the maximum tensile stress decreased in a powerlaw manner with increasing diffusible hydrogen content. Finite element method (FEM) calculations demonstrated that the peak value of the maximum principal stress and the peak value of the locally accumulated hydrogen concentration at the maximum tensile stress were in good agreement with one power law relationship for the specimens with different stress concentration factors
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 1859-1864 
    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: Grain refining experiments for casting of pure Al were conducted to evaluate the grainrefinement performance of an Al-5mass%Ti alloy refiner before and after cold rolling. Al3Tiparticles in the Al-Ti alloy refiner were efficiently fragmented by cold rolling. The size of theAl3Ti particles in cold rolled Al-Ti alloy refiner decreased from 280μm to 30μm with increasingreduction ratio of cold rolling. Mean size of α-Al grains in pure Al cast refined by the cold rolledAl-Ti alloy refiner decreased from about 500μm to 200μm with increasing the reduction ratio. Inorder to investigate mechanical property of the pure Al cast refined by the cold rolled Al-Ti alloyrefiner, Vickers hardness test and tensile test were conducted. Strength of the pure Al cast refinedby the cold rolled Al-Ti alloy refiner increased with increasing the reduction ratio. The strengthimprovement of pure Al cast refined by the cold rolled Al-Ti alloy refiner followed Hall-Petchrelationship. From obtained results, it was concluded that cold rolling for refiner is usefulpractical application for pure Al cast
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 481-486 
    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: Microstructural evolution taking place during equal channel angular pressing (ECAP) wasstudied in a commercial coarse-grained Al-6%Mg-0.4%Mn-0.3%Sc alloy in a temperature interval 200-450oC (~0.5-0.8 Tm). Samples were pressed using route A to a total strain of 12 and quenched in waterafter each ECAP pass. Uniform fine-grained microstructures with the average grain sizes of 0.7 and 2.50m, are almost fully evolved at high ECAP strains at 250oC and 450oC, respectively, while ECAP at300oC (~0.6 Tm) leads to the formation of bimodal grain structure with fine grains of around 1 µm andrelatively coarse grains of around 8 µm. The latter are developed due to the occurrence of staticrecrystallization during “keeping” time in the ECAP channel and/or reheating between ECAP passes. Themicrostructural development under warm-to-hot ECAP conditions is discussed in terms of the largepotential for grain boundary migration resulted from an overlapping of accelerated grain boundarymobility at high pressing temperatures and enhanced driving force for recrystallization, which is caused bya strong inhibition of dynamic recovery in a heavily-alloyed Al alloy
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 2892-2897 
    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 this study, an Al-7 wt% Si-1.5 wt% Cu alloy was subjected to severe plasticdeformation (SPD) by an equal-channel angular pressing (ECAP) technique. The ECAP processwas repetitively carried out up to 8 passes using a strain introduction method of route BC, at atemperature of 25 °C and a pressing rate of 0.33 mm s-1. Microstructures of the samples beforeand after ECAP were observed by a scanning electron microscopy (SEM). Electrochemicalproperties of the Al-Si-Cu alloy fabricated by ECAP have been investigated in a borate-boric acidbuffer solution containing Cl¯ ions at pH 8.3 and 25 °C by potentiodynamic polarization test.Corrosion pits on the sample surface after anodic polarization were investigated by means of SEM.The anodic polarization showed that as-cast Al-Si-Cu alloy with plate-shaped Si particles has poorresistance against pitting corrosion comparing to quenched sample without ECAP. Pittingpotentials of ECAPed Al-Si-Cu alloy samples were higher than that of the sample without ECAP.In the Al-Si-Cu alloy, the corrosion pits were found in the region of Si particles and the size of pitsformed on the ECAPed samples became smaller than that without ECAP. It is considered that theimprovement of the pitting resistance of ECAPed Al-Si-Cu alloy is due to homogenous distributionof spherical Si particles generated during ECAP process
    Type of Medium: Electronic Resource
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