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SHOCK-INDUCED TRANSFORMATION OF TITANIUM-NICKEL ALLOYS,
NAVAL ORDNANCE LAB WHITE OAK MD
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The report describes the behavior under shock wave compression of three compound alloys of titanium and nickel. Explosive-propelled metal plates transmitted pressures of up to 0.8 megabar in specimens with 50.3 atomic Ni, 51.4 atomic Ni, and 55.0 atomic Ni. Shock wave and free-surface velocities were measured optically. The corresponding compression points were determined from the Rankine-Hugoniot equations. The data reveal that the dynamic compressibilities of Ti-Ni alloys are sensitive to temperature changes. At 90 kbars the microstructure of the near stoichiometric 50.3 atomic Ni undergoes an almost complete martensitic transformation. The transformation is less evident in 51.4 atomic Ni. The 55.0 atomic Ni alloy is unchanged by the 90-kbar shock. At 270-280 kbars the shock velocity in stoichiometric Ti-Ni specimens, initially at 15C, becomes insensitive to pressure. The formation of a new phase is indicated. Author
APPROVED FOR PUBLIC RELEASE