The Effect of A1febe4 on Mechanical Properties of Fabricated Polycrystalline Beryllium

摘要

The study shows that the A1FeBe4 reaction to be reversible, the dissolution of the phase being accompanied by an increase in free aluminum, with reasonable evidence for iron being in solid solution. Both room- and elevated-temperature strengths are strongly dependent on the reaction, strength increasing with excess iron, i.e., iron not combined as A1FeBe4. Room-temperature ductility showed no consistent dependence on the phase behavior; however, elevated-temperature ductility varied considerably with iron and aluminum contents. In general, optimum ductilities correspond to iron/aluminum weight ratios of two or greater and/or low aluminum contents. Aging generally lowers strength properties at all temperatures, and has little effect on room-temperature ductility. On the other hand, aging was shown to increase elevated-temperature ductility in all cases tested. (Author)