Stress Corrosion Tests of Some Wrought MG-Li Base Alloys

摘要

Seven experimental wrought Mg-Li base alloys (Mg-14Li with various additions of Al, Zn, Ag, and/or Si) were tested for stress corrosion susceptibility in humid air, following mechanical and thermal processing to approx imate conditions in the heat-affected zone of a weld. Stress levels during exposure were uncertain because of creep effects. Rapid cooling from 700F rendered susceptible those alloys containing aluminum, regardless of other alloy content. However, heating for 24 hours at 300F following such rapid cooling restored their resistance to stress Corrosion. Alloys strengthened by additions of zinc, silicon, and/or silver, but with aluminum excluded, did not fail in stress corrosion under the conditions of test used in this study. (Author)