Accession Number : ADA255351


Title :   Determination of Operable Deformation Mechanisms during Ballistic Impact in Tungsten Single Crystals, Utilizing Transmission Electron Microscopy


Descriptive Note : Final rept. 30 Mar-15 May 1991


Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD


Personal Author(s) : Herring, R A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255351.pdf


Report Date : Aug 1992


Pagination or Media Count : 57


Abstract : The performance of tungsten single crystals in ballistic impact varies strongly as a function of crystallographic orientation. The deformation structure of recovered single crystal rods fired in ballistic environments has been characterized by optical microscopy, SEM and TEM, and x-ray diffraction. The observed microstructures are varied and provide substantial insights into the factors governing the penetration and flow behavior under ballistic conditions. Crystallographic orientation influences the potential for developing shear which enhances material flow, and this enhancement ultimately maximizes the energy available for target penetration. Microstructural analysis elucidates the various mechanisms occurring during the flow process for single crystals of high-symmetry orientations, and suggests possible analogies between the penetration behavior of the tungsten single crystals and other materials.


Descriptors :   *SINGLE CRYSTALS , *MICROSCOPY , *ELECTRON MICROSCOPY , FUNCTIONS , ENVIRONMENTS , IMPACT , MATERIALS , DEFORMATION , PENETRATION , ANALOGIES , TUNGSTEN , BALLISTICS , RODS , FLOW , BEHAVIOR , SYMMETRY , DIFFRACTION , DISLOCATIONS , ELECTRONS , TARGETS , CRYSTALS , ENERGY , STRUCTURES , AUGMENTATION , X RAY DIFFRACTION


Subject Categories : Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE