Posted by Sarup Chopra on May 05, 2008 at 17:01:06:
In Reply to: etchant for aluminum alloy posted by Antonio Magallanes on May 05, 2008 at 12:12:45:
Unlike gas porosity, shrinkage porosity assumes a dendritic shape. As Jeff rightfully pointed out, one does not need to etch the sample to spot it.