Comparison of microstructures for plane shock-loaded and impact crater-related nickel: the microtwin-microband transition

Plane-wave shock-loaded Ni exhibits {111} microtwins which increase in frequency with increasing peak shock pressure above a critical twinning pressure of ∼30 GPa. In contrast, microbands coincident with traces of {111} are produced below impact craters in Ni targets by stainless steel projectiles a...

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Bibliographic Details
Published in:Journal of materials science 2003-05, Vol.38 (10), p.2223-2231
Main Authors: ESQUIVEL, E. V, MURR, L. E, TRILLO, E. A, BAQUERA, M
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Craters
Dislocation models
Exact sciences and technology
FCC metals
High-pressure and shock-wave effects in solids and liquids
Materials science
Mechanical and acoustical properties of condensed matter
Metals. Metallurgy
Microtwins
Nickel
Physics
Projectiles
Stainless steels
Twinning
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Summary:Plane-wave shock-loaded Ni exhibits {111} microtwins which increase in frequency with increasing peak shock pressure above a critical twinning pressure of ∼30 GPa. In contrast, microbands coincident with traces of {111} are produced below impact craters in Ni targets by stainless steel projectiles at velocities up to 3.5 km/s. The microband widths are ten times the 0.02 μm twin widths and are characterized by misorientations of roughly 2°. Both shock-loaded and impacted Ni have similar dislocation cell structures which decrease in cell size with increasing pressure or equivalent stress. The exclusive formation of microbands in connection with impact craters in Ni is expected on the basis of its high SFE (∼130 mJ/m2), and a simple dislocation model is developed for the microtwin-microband transition based on graphical summaries which include shock (stress) geometry and SFE effects in FCC metals and alloys.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1023796619086