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Dislocation Substructures in Shock-Loaded N13AI

Published online by Cambridge University Press:  22 February 2011

Diane E. Albert and
T. George
Diane E. Albert
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
T. George
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

The deformation substructure and mechanical response of the LI2 intermetallic, Ni3Al, subjected to shock-wave loading was studied. Following shock prestrains to shock pressures of approximately 14.0 GPa, 23.5 GPa, and 47.2 GPa, the reload yield strength of Ni3Al was measured to be 750 MPa, 1250 MPa and 1500 MPa, respectively. The effective hardening in the shock-loaded Ni3Al exceeds that quasistatically obtained when deformed to roughly the same equivalent strains. Coarse planar slip on {111} type planes, a high density of stacking faults, and deformation twins with a {111} type twinning plane were observed in the shocked material. An increasing propensity for twinning and stacking fault formation was observed with higher shock peak pressures.

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