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  • 2005-2009  (4)
Material
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  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 512 (Apr. 2006), p. 97-102 
    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: Crevice corrosion experiments on pure iron were carried out in a 0.5 M acetate buffer with varied chloride concentrations. Changes in resultant currents and morphology due to crevice attack were explained by IR potential drop mechanisms. The specimens experienced potential drop inside the crevice, which resulted in the formation of passive, active, and hydrogen evolution regions. The passive region did not exist in the electrolyte containing 0.05 M and 0.5 M chloride. Hydrogen evolution, which occurred inside the crevice was measured on rear side of the specimenusing hydrogen permeation test. The results suggest that the hydrogen produced inside the crevice is measurable using a permeation test. The entry of diffusible hydrogen showed a significant increase with the addition of chloride into the acetate buffer
    Type of Medium: Electronic Resource
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