The Influence of Lattice Imperfections on the Chemical Reactivity of Solids. The Growth, Perfection and Defect Properties of PETN (Pentaerythritol Tetranitrate) and RDX (Cyclotrimethylene Trinitramine) Single Crystals. Part 2.
Final technical rept.,
UNIVERSITY OF STRATHCLYDE GLASGOW (SCOTLAND) DEPT OF PURE AND APPLIED CHEMISTRY
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An assessment has been made of the primary dislocation slip systems in the explosive pentaerythritol tetranitrate PETN and cyclotrimethylene trinitramine RDX using a combination of dislocation etching and microhardness indentation techniques. Hardness measurements were made on all major habit faces as a function of temperature and load. These showed that, within the attainable temperature range PETN 292-353, RDX 293-373K no change in hardness occurred which could be associated with the development of deformation mechanisms additional to those operating at room temperature. The hardness values of both materials were consistent with values obtained in some previous measurements PETN 17kgsq.mm, RDX 39kgsq.mm. Solvent etching with acetone 5s at 274K proved to be an excellent method for revealing the emergent ends of growth and mechanically induced dislocations in PETN. Etching of microhardness indentations confirmed that observable slip traces comprised dislocations. These migrated up to 160 micrometers 20g load from a 110 primary slip plane.
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