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Anisotropic shock response of columnar nanocrystalline Cu
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10.1063/1.3437654
/content/aip/journal/jap/107/12/10.1063/1.3437654
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/12/10.1063/1.3437654

Figures

Image of FIG. 1.
FIG. 1.

The configuration of a six-grain columnar Cu structure unit, viewed along the rotation axis [100]. It also represents the cross-section for the -direction loading. Numbers 1–3 denote grain types with different color coding.

Image of FIG. 2.
FIG. 2.

The configurations for shock loading along the -direction (a) and -direction (b), and the diagram for the loading along the -direction (c). Color coding in (c) is based on the local density . The schematic dashed lines indicate the -type GBs I–V. The number pair 12 denotes the GB between type 1 and 2 grains (similar for others).

Image of FIG. 3.
FIG. 3.

The diagram for the -direction loading. Color coding is based on the local stress .

Image of FIG. 4.
FIG. 4.

Free surface histories for loading along three different directions (, , and ). The arrows indicate the HEL. Spall pullback in is evident for the transverse -direction and -direction loading.

Image of FIG. 5.
FIG. 5.

2D distribution of (a), (b), temperature (c), and (d), averaged over the -direction for the -direction loading at (shock compression). The -type GBs (I–V) and representative grains (1–3) are indicated. The white dots in (c) denote the GB profile. The arrow in (d) denotes a slip band within a grain interior.

Image of FIG. 6.
FIG. 6.

2D distribution of (a), (b), temperature (c), and (d), averaged over the -direction for the -direction loading at (shock compression). In (c), numbers 1–3 indicate three typical grains, and the GB profile is indicated with white dots. The arrow in (d) denotes a slip band.

Image of FIG. 7.
FIG. 7.

2D distribution of (a), (b), temperature (c), and (d) at the shock state for the -direction loading . The averaging thickness along the shock direction is 5 Å. Numbers 1–3 in (a) indicate the three typical grains. The GB profiles are shown in white dots.

Image of FIG. 8.
FIG. 8.

Atomic configurations during shock , release, tension, and spall for the -direction loading. Color coding is based on centrosymmetry. Crystal plasticity (e.g., stacking faults) is indicated with an arrow, and three typical grains (1–3) are noted in the configuration.

Image of FIG. 9.
FIG. 9.

Atomic configurations during shock , release, tension, and spall for the -direction loading. Also see Fig. 8.

Image of FIG. 10.
FIG. 10.

Atomic configurations during shock (a), tension, and spall (b) for the -direction loading. Also see Fig. 8. The arrow in (a) denotes the shock direction, which is out of the paper plane in (b).

Image of FIG. 11.
FIG. 11.

2D distribution of during tension and void nucleation. (a)–(c) denote the -direction, -direction, and -direction loading, at , 30.8 ps, and 37.2 ps, respectively. In (a) and (b), averaging along the -direction is adopted, and the averaging thickness along the shock direction is 5 Å in (c). Numbers 1–3 indicate the three typical grains, and the arrow denotes a slip band.

Image of FIG. 12.
FIG. 12.

2D distribution of density (a)–(d) averaged over the -direction, and the corresponding distributions of (e)–(h) and temperature (i)–(l) for the -direction loading during void nucleation at GBs. , 26.0 ps, 26.8 ps, and 27.6 ps for (a)–(d), respectively, as well as for (e)–(h) and (i)–(l). The black dots in (e)–(h) denote the GB profile; numbers 1–3 in (e) indicate three representative grains and, I–V, the -type GBs.

Image of FIG. 13.
FIG. 13.

2D distribution of density (a)–(d) averaged over the -direction, and the corresponding distributions of (e)–(h) and temperature (i)–(l) for the -direction loading during void nucleation at GBs. , 31.6 ps, 32.8 ps, and 34 ps for (a)–(d), respectively, as well as for (e)–(h) and (i)–(l). Numbers 1–3 in (a) indicate three typical grains. GBs are illustrated in (e)–(h) as black dots.

Image of FIG. 14.
FIG. 14.

2D distribution of the potential energy during void nucleation and growth for the -direction loading. (a)–(c) denote , 38 ps, and 39.2 ps, respectively. Numbers 1–3 indicate the three typical types of grains. The averaging thickness along the shock direction is 5 Å.

Tables

Generic image for table
Table I.

Shock and spall parameters of columnar nanocrystalline Cu from 1D analysis.

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/content/aip/journal/jap/107/12/10.1063/1.3437654
2010-06-16
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Anisotropic shock response of columnar nanocrystalline Cu
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/12/10.1063/1.3437654
10.1063/1.3437654
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