Aligned fibers of beryllium in aluminum were obtained by zone melting of an aluminum-20 wt% beryllium alloy. Unfortunately, the fiber length was limited by banding caused by freezing rate fluctuations. Thus, the ultimate strength was only about 11 × 10 3 psi and elastic modulus 15 x 106 psi. Analytical expressions were found for the concentration perturbation caused by changes in freezing rate, both for progressive freezing with no convection and for zone melting with much liquid mixing
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