Abstract
The strength of polycrystals is known to increase with decreasing grain size, known as Hall-Petch effect. However, this relationship fails to predict the strength of samples with a non-uniform distribution of grain sizes. In this study, we purposely designed and fabricated copper micropillars with a strongly bimodal microstructure: half volume consisted of a large number of ultrafine grains, while the other half was predominantly single-crystalline. Micropillar compression evidenced that bimodal samples are 35% stronger than their counterparts containing only ultrafine grains. This paradoxical finding highlights the greater strengthening potential of microstructure distribution engineering, compared to the traditional grain refinement strategy.
| Original language | English |
|---|---|
| Pages (from-to) | 55-59 |
| Number of pages | 5 |
| Journal | Scripta Materialia |
| Volume | 165 |
| Early online date | 19 Feb 2019 |
| DOIs | |
| Publication status | Published - May 2019 |
Keywords
- Bimodal grained microstructure
- Crystal structure
- Grain boundary strengthening
- Hall-Petch effect
- Mechanical property testing
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
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