| An investigation on the effect of Be on S;A higher value is obtained of the nuclei density parameter (k) for the Be-containing alloy, which is consistent with the higher density of S;Be alters the defect structure from a high density of dislocation loops in the solution-treated base alloy to one of fewer dislocation helices, which is attributed to the high Be-vacancy binding energy. On aging the Be-containing alloy at 190;It is shown that there is a transition from S;It is shown that additions of 0.15% or 0.25% Be to Al-2.5Cu-1.2Mg alloy accelerated the age-hardening rate and significantly increased the peak hardness levels of the aged alloys. Kinetic data analyses show that precipitation of S;The X-ray diffraction data show that up to 2.5 at% Be is incorporated into the S phase, and EDS and WDS analyses indicate that both the Cu and Mg solubility in Al(;The yield and tensile strengths, ductility, and impact toughness for the precipitation hardened alloy are increased by Be addition, which can be attributed to the refinement of S... |
