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Title: Shock compression and quasielastic release in tantalum

Abstract

Previous studies of quasielastic release in shock-loaded FCC metals have shown a strong influence of the defect state on the leading edge, or first observable arrival, of release wave, due to large density of pinned dislocation segments behind the shock front, their relatively large pinning separation, and a very short response time as determined by drag coefficient in shock-compressed state. This effect is entirely equivalent to problems associated with elastic moduli determination using ultrasonic methods. This is particularly true for FCC metals, which have an especially low Peierls stress, or inherent lattice resistance, that has little influence in pinning dislocation segments and inhibiting anelastic deformation. BCC metals, on the other hand, have a large Peierls stress that essentially holds dislocation segments in place at low net applied shear stresses and thus allows fully elastic deformation to occur in the complete absence of anelastic behavior. Shock-compression and release experiments have been performed on tantalum (BCC), with the observation that the leading release disturbance is indeed elastic. This conclusion is established by examination of experimental VISAR records taken at the tantalum/sapphire (window) interface in a symmetric-impact experiment which subjects the sample to a peak longitudinal stress of approximately 7.3 GPa, in comparisonmore » with characteristic code calculations.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
6490880
Report Number(s):
LA-UR-93-1785; CONF-9306167-3
ON: DE93014566
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 14. international conference on high pressure science and technology and 1993 technical meeting of the topical group on shock compression of condensed matter, Colorado Springs, CO (United States), 28 Jun - 3 Jul 1993
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TANTALUM; COMPRESSION; SHOCK WAVES; ALUMINIUM; BCC LATTICES; DISLOCATION PINNING; FCC LATTICES; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CUBIC LATTICES; ELEMENTS; METALS; TRANSITION ELEMENTS; 360103* - Metals & Alloys- Mechanical Properties

Citation Formats

Johnson, J N, Hixson, R S, Tonks, D L, and Gray, III, G T. Shock compression and quasielastic release in tantalum. United States: N. p., 1993. Web.
Johnson, J N, Hixson, R S, Tonks, D L, & Gray, III, G T. Shock compression and quasielastic release in tantalum. United States.
Johnson, J N, Hixson, R S, Tonks, D L, and Gray, III, G T. Fri . "Shock compression and quasielastic release in tantalum". United States. https://www.osti.gov/servlets/purl/6490880.
@article{osti_6490880,
title = {Shock compression and quasielastic release in tantalum},
author = {Johnson, J N and Hixson, R S and Tonks, D L and Gray, III, G T},
abstractNote = {Previous studies of quasielastic release in shock-loaded FCC metals have shown a strong influence of the defect state on the leading edge, or first observable arrival, of release wave, due to large density of pinned dislocation segments behind the shock front, their relatively large pinning separation, and a very short response time as determined by drag coefficient in shock-compressed state. This effect is entirely equivalent to problems associated with elastic moduli determination using ultrasonic methods. This is particularly true for FCC metals, which have an especially low Peierls stress, or inherent lattice resistance, that has little influence in pinning dislocation segments and inhibiting anelastic deformation. BCC metals, on the other hand, have a large Peierls stress that essentially holds dislocation segments in place at low net applied shear stresses and thus allows fully elastic deformation to occur in the complete absence of anelastic behavior. Shock-compression and release experiments have been performed on tantalum (BCC), with the observation that the leading release disturbance is indeed elastic. This conclusion is established by examination of experimental VISAR records taken at the tantalum/sapphire (window) interface in a symmetric-impact experiment which subjects the sample to a peak longitudinal stress of approximately 7.3 GPa, in comparison with characteristic code calculations.},
doi = {},
url = {https://www.osti.gov/biblio/6490880}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {1}
}

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