51312-01224-The effect of heat treatment and SiC particles on the microstructure and corrosion property of frict

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Product Number: 51312-01224-SG

ISBN: 01224 2012 CP

Author: Don Hyun Choi

Publication Date: 2012

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The ability of nano-scale particles of SiC placed in AA5083 as a means of controlling the sensitization response that leads to stress corrosion cracking is evaluated using friction stir welding as an innovative tool for creating these alloys. Friction stir welding was performed with a tool rotation speed of 1800 rpm with a tool advance rate of 87 mm/min. SiC powder at a mean particle size of 20 nm was fed into the stirred zone by placing the powder between the two plates to be welded. The SiC particles were homogeneously distributed within the stirred zone after friction stir welding. Welded specimens both with and without the SiC particles were annealed at 175o C for 10 days which has been found previously to produce well defined continuous beta phase (Al3Mg2 intermetallic) along the grain boundaries responsible for dramatic stress corrosion cracking and for severe responses in the ASTM G67-04 NAMLT (nitric acid mass loss test) evaluation. It is found that the corrosion response in the sensitized state characterized by NAMLT is strongly improved by the nanometer scale SiC particles which act as nucleation sites for grain interior precipitation hindering grain boundary precipitation of beta phase.