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Internal Structural Factors Determining the Flow and Fracture Strengths of Beryllium.
Final rept. 1 Sep 66-31 Aug 68,
BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
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The ductile-brittle transition temperature of beryllium at various strain values has been represented by an analytical expression and is dependent on a number of material parameters. This theory is in agreement with grain size and strain rate dependence of the transition temperature which may possibly be lowered by such methods as establishing preferred orientation of grains to alter the ductility. The hardness-grain size relation has been studied for beryllium and the hardness values of individual grains supports the metallographic observations of anisotropic yielding and flow. Author
APPROVED FOR PUBLIC RELEASE