SURFACE METALLOGRAPHIC METHOD FOR CHARACTERIZING THE DEGREE OF SENSITIZATION OF ALUMINUM-MAGNESIUM ALLOYS
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Aug 1, 2016
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Aug 7, 2015
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Abstract
A non-destructive method for assessing the “degree of sensitization” of ship structures formed from aluminum-magnesium marine service alloys. Features of the method include (1) selective etching of beta phase in a sensitized aluminum-magnesium alloy (2) metallographic recording of the etched surface; (3) image enhancement to produce high-contrast binary images of etched and unetched areas; (4) image analysis of the enhanced images using line segments along grain boundaries to provide statistical information about the grain boundary beta phase percentage and (5) calibration, whereby the grain boundary beta phase percentage is converted to an expression of the degree of sensitization in the sample.
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