Abstract
Abstract: Indentation tests provide a facile route to gathering strength and stiffness information from small-scale samples, but typically have not been used to systematically assess distributions of surface plastic strain. The objective of the present work is to quantify in-plane plastic strain around micrometer-scale indents via digital image correlation (DIC). We demonstrate the method by comparing pre- and post-indentation surface images, acquired with a scanning electron microscope (SEM). Applying this method to metal composites synthesized by liquid- and solid-metal dealloying, we find that the maximum surface strains around indents do not change with the indentation depth, that strain concentrates preferentially in regions with largest composite constituent dimensions, and that the constituents are not co-deforming. We conclude that the method we have demonstrated is suitable for characterizing the relative propensity of materials to undergo uniform or localized plastic flow. Graphic abstract: [Figure not available: see fulltext.]
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2277-2290 |
| Number of pages | 14 |
| Journal | Journal of Materials Research |
| Volume | 36 |
| Issue number | 11 |
| DOIs | |
| State | Published - Jun 14 2021 |
Funding
This work was supported by the National Science Foundation under Grant. No. 1623051. Use of the TAMU Materials Characterization Facility, with assistance from Dr. W. Kuo and Dr. W. Serem, is acknowledged. We thank Jonah Erlebacher and Bernard Gaskey for preparation of the TiW ingot. We are grateful to J. Blaber for his assistance with Ncorr and to G. M. Pharr for helpful discussions.
Keywords
- Microscale
- Nano-indentation
- Scanning electron microscopy
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering