Fine grain beryllium bodies

Details Fine grain beryllium bodies Fine grain beryllium bodies

1975-08-25

1977-04-12

Stallard, W.

Metal treatment

Compositions

Heat treating

148 115R, 148 115F, C22F 116

Patent

active

040173330

ABSTRACT:
A method for enhancing the mechanical properties of cast beryllium and beryllium alloy bodies by reducing beryllium grain size. More particularly, grain size is reduced by forming a metal beryllide phase that is soluble in molten beryllium but of limited solubility in the solid metal. Initially, molten beryllium is cast into a mold and solidified resulting in precipitation of the metal beryllide in the form of finely divided particles at the beryllium grain boundaries. The cast body is then mechanically worked below its recrystallization temperature to form an unstable, deformed microstructure which is converted to a fine grain microstructure during a subsequent anneal above the recrystallization temperature of the beryllium or beryllium alloy body. The anneal can be a separate operation or a continuation of the plastic deformation operation.

REFERENCES:
patent: 2872363 (1959-02-01), Macherey
patent: 3333994 (1967-08-01), Mallen et al.
patent: 3350241 (1967-10-01), Mallen et al.
patent: 3699798 (1972-10-01), Anderson, Jr. et al.
patent: 3791878 (1974-02-01), Taylor et al.

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