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Failure Properties of Aluminum and Aluminum Alloys under Impact Conditions.
WASHINGTON STATE UNIV PULLMAN DEPT OF PHYSICS
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Research under this grant was directed to two distinct tasks. First was study of the kinetics of shock-induced phase transitions in solids second was measurement of precursor amplitudes in aluminum under carefully controlled conditions. Shock-induced stresses were measured in single crystals of KCl with shock waves propagating in 100, 110, and 111 directions and in single crystals of BaF2 with propagation in 111 and 100 directions. KCl measurements give clear evidence of the initiation of transformation at the established fcc-bcc transformation pressure. Stress-time profiles in BaF2 with 111 orientation have a complex structure which apparently results from interaction between the shear yielding process and phase transformation. Precursor amplitudes in aluminum are uniformly low for 1060-0 commercial aluminum, 5-9s single crystals, and single crystals doped with .01 and 0.1 atomic percent copper. Variation of heat treatment to change precipitate structure affects precursor amplitude as it does static yield stress.
APPROVED FOR PUBLIC RELEASE