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  • 1
    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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