You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.


    Dislocation Aspects of Plastic Flow and Cracking at Indentations in Magnesium Oxide and Cyclotrimethylenetrinitramine Explosive Crystals

    Published: 0

      Format Pages Price  
    PDF (388K) 18 $25   ADD TO CART
    Complete Source PDF (4.9M) 302 $55   ADD TO CART

    Cite this document

    X Add email address send
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word


    Unique information about the hardness properties of crystalline materials can be obtained from studying the dislocation mechanisms involved in microindentation testing. The dislocation description provides information in addition to the knowledge of indentation processes gained from earlier continuum mechanics analyses and from models of the orientation dependence of hardness based on the geometrical arrangement of slip systems. For example, (1) mapping of the residual dislocation distributions within microindentation plastic zones can be used to characterize the deformation field and (2) specification of the dislocation interactions that occur among the crystal deformation systems is useful in evaluating the extent to which the hardness is affected by work hardening and cracking mechanisms. An interesting application of this information is to microindentation hardness testing of explosive crystals.


    microindentation hardness, dislocations, pileups, cracking, scanning electron microscopy, X-ray topography, chemical etch pitting, magnesium oxide, cyclotrimethylenetrinitramine (RDX), energy dissipation, hot spots, microindentation hardness testing

    Author Information:

    Armstrong, RW
    Professor, University of Maryland, College Park, MD

    Elban, WL
    Materials research engineerassociate professor, Naval Surface Weapons CenterLoyola College, Silver SpringBaltimore, MDMD

    Committee/Subcommittee: E04.05

    DOI: 10.1520/STP32954S