Strain Hardening in Polycrystalline and Nanocrystalline Nickel
| Periodical | Advanced Materials Research (Volume 409) |
|---|---|
| Main Theme | THERMEC 2011 Supplement |
| Edited by | T. Chandra, M. Ionescu and D. Mantovani |
| Pages | 550-554 |
| DOI | 10.4028/www.scientific.net/AMR.409.550 |
| Citation | B.T.F. Tang et al., 2011, Advanced Materials Research, 409, 550 |
| Online since | November, 2011 |
| Authors | B.T.F. Tang, Uwe Erb, I. Brooks |
| Keywords | Hardness Testing, Nanocrystalline, Polycrystalline Nickel, Strain Hardening |
| Price | US$ 28,- |
The work hardening behavior of electrodeposited nanocrystalline (grain size: 100 nm) and fully annealed polycrystalline nickel (grain size: 160 µm) was examined by hardness indentation analysis. First, plastic strain was introduced into the materials through large Rockwell hardness indentations. A series of Vickers micro-hardness traces below and away from the Rockwell indentation then measured the change in hardness as a function of distance from the plastic zone. The results showed that polycrystalline nickel exhibited considerable strain hardening, with micro-hardness values closest to the Rockwell indentation averaging twice the hardness value of the bulk material. On the other hand, for the nanocrystalline nickel the Vickers micro-hardness values changed only by a few percent indicating a limited strain hardening capacity.
