Abstract
The effect of heat-treatment in the range 650°–950°C for times between halfan-hour and 500 h on the tensile properties under fast strain rates at 600°C of a batch of hot-pressed and warm-extruded virgin Brush QMV beryllium has been studied. The creep properties of this material were also investigated in the range 500°–600°C in the as-extruded condition and after heat-treatments at 950°C and 700°C. Metallographie and X-ray techniques were used to follow changes of structure and constitution brought about by heat-treatment and by strain. Heat-treatment at low temperatures was found to increase the ductility at fast strain rates but decrease the creep strength, whilst heat-treatment at high temperatures was found to decrease the ductility at fast strain rates and increase the creep strength. Heat-treatment had no effect on tensile strength or on creep ductility. The results are attributed to a precipitation phenomenon involving intermetallic phases, which have been identified by X-ray diffraction methods, and to the presence of oxide particles within the grain boundaries.
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