Hugoniot of a Reactive Metal Powder Mixture
The shock behaviour of reactive metal powders is an area of significant current research. These materials can be compressed under quasi-static loading to form a solid powder compacts that can hold their form. This is possible due to the permanent plastic deformation of at least one of the metal species involved. The compressed materials can then be used as structural components of various larger systems. If the correct choice of powdered materials is made then under suitable loading conditions, there is the potential for an exothermic intermetallic reaction. This ability to have components which are inert under the vast majority of loading conditions, but which can be induced to give out energy under specific conditions is very useful for example in the design of shell cases . While the reactivity of these materials is critical to the design of systems utilising this technology, an understanding of the material properties in the unreacted state is also important. This is both because knowing the stress levels reached can be key to understanding the reactive behaviour, and because the materials are often intended to be used structurally. This paper examines the measurement of one aspect, the Hugoniot, of the mechanical performance of a specific powder compact. The powder compact was a 75% TMD nickel aluminium mixture in a 1:1 stoichiometric ratio.
KeywordsPowder Compact Press Powder Compact Free Surface Velocity Nickel Aluminium Cavendish Laboratory
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- 1.Homan, B.E., McNesby, K.L., Ritter, J., Colburn, J., Brant, A.: Characterisation of the Combustion Behaviour of Aluminium-Nickel Based Reactive Materials. Army Research Laboratory Report ARL-TR-4917 (2009)Google Scholar