Accession Number : AD0653080

Title :   SHOCK-INDUCED TRANSFORMATION OF TITANIUM-NICKEL ALLOYS,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Coleburn,N. L.

Report Date : 01 MAY 1967

Pagination or Media Count : 33

Abstract : 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)

Descriptors :   (*NICKEL ALLOYS, SHOCK WAVES), (*TITANIUM ALLOYS, SHOCK WAVES), (*SHOCK WAVES, *PHASE STUDIES), COMPRESSIVE PROPERTIES, EXPLOSION EFFECTS, GRAIN STRUCTURES(METALLURGY), MARTENSITE, INTERMETALLIC COMPOUNDS, THERMAL PROPERTIES

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE