1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The Hall–Petch breakdown at high strain rates: Optimizing nanocrystalline grain size for impact applications
Rent:
Rent this article for
USD
10.1063/1.3000655
/content/aip/journal/apl/93/17/10.1063/1.3000655
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/17/10.1063/1.3000655
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Representative data from the initial impact event on a grain size Ni–W specimen. The upper panel demonstrates the output displacement-time data, from which the velocity, shown in the lower panel, is calculated.

Image of FIG. 2.
FIG. 2.

Dynamic hardness as a function of grain size on double logarithmic scales. Hall–Petch scaling is observed down to a grain size of , followed by a breakdown manifested as a strengthening peak and region of inverse Hall–Petch weakening. The quasistatic hardness measurements from our previous study (Ref. 15) are included for reference.

Image of FIG. 3.
FIG. 3.

Hardness as a function of strain rate for specimens with grain sizes in the range . The dynamic measurements from the present work align well with the extrapolation from quasistatic nanoindentation results reproduced from Ref. 15. Corresponding SEM images of the residual impressions reveal discernible shear offsets around the impact sites for grain sizes as large as . (Some of the impressions have a scar across them, made upon withdrawal of the tip; these scars are formed after the conclusion of the test and are not relevant to the discussion).

Loading

Article metrics loading...

/content/aip/journal/apl/93/17/10.1063/1.3000655
2008-10-31
2014-04-18
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The Hall–Petch breakdown at high strain rates: Optimizing nanocrystalline grain size for impact applications
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/17/10.1063/1.3000655
10.1063/1.3000655
SEARCH_EXPAND_ITEM