Okafor, Chukwudalu ; Ding, Kuan ; Preuß, Oliver ; Khansur, Neamul H. ; Rheinheimer, Wolfgang ; Fang, Xufei (2024)
Near-surface plastic deformation in polycrystalline SrTiO3 via room-temperature cyclic Brinell indentation.
In: Journal of the American Ceramic Society, 107 (10)
doi: 10.1111/jace.19962
Article, Bibliographie
This is the latest version of this item.
Abstract
Dislocations are being used to tune versatile mechanical and functional prop- erties in oxides with most current studies focusing on single crystals. For potentially wider applications, polycrystalline ceramics are of concern, pro- vided that dislocations can be successfully introduced. However, in addition to preexisting pores and flaws, a major barrier for bulk plastic deformation of polycrystalline ceramics lies in the grain boundaries (GBs), which can lead to dislocation pile-up and cracking at the GBs due to the lack of sufficient indepen- dent slip systems in ceramics at room temperature. Here, we use the cyclic Brinell indentation method to circumvent the bulk deformation and focus on nearsurface regions to investigate the plastic deformation of polycrystalline SrTiO3 at room temperature. Dislocation etch-pit analysis suggests that plastic deformation can be initiated within the grains, at the GBs, and from the GB triple junction pores. The deformability of the individual grains is found to be dependent on the number of cycles, as also independently evidenced on single-crystal SrTiO3 with representative surface orientations (001), (011), and (111). We also identify a grain-size-dependent plastic deformation.
| Item Type: | Article |
|---|---|
| Erschienen: | 2024 |
| Creators: | Okafor, Chukwudalu ; Ding, Kuan ; Preuß, Oliver ; Khansur, Neamul H. ; Rheinheimer, Wolfgang ; Fang, Xufei |
| Type of entry: | Bibliographie |
| Title: | Near-surface plastic deformation in polycrystalline SrTiO3 via room-temperature cyclic Brinell indentation |
| Language: | English |
| Date: | 3 July 2024 |
| Place of Publication: | Oxford |
| Publisher: | Wiley Blackwell |
| Journal or Publication Title: | Journal of the American Ceramic Society |
| Volume of the journal: | 107 |
| Issue Number: | 10 |
| DOI: | 10.1111/jace.19962 |
| Corresponding Links: | |
| Abstract: | Dislocations are being used to tune versatile mechanical and functional prop- erties in oxides with most current studies focusing on single crystals. For potentially wider applications, polycrystalline ceramics are of concern, pro- vided that dislocations can be successfully introduced. However, in addition to preexisting pores and flaws, a major barrier for bulk plastic deformation of polycrystalline ceramics lies in the grain boundaries (GBs), which can lead to dislocation pile-up and cracking at the GBs due to the lack of sufficient indepen- dent slip systems in ceramics at room temperature. Here, we use the cyclic Brinell indentation method to circumvent the bulk deformation and focus on nearsurface regions to investigate the plastic deformation of polycrystalline SrTiO3 at room temperature. Dislocation etch-pit analysis suggests that plastic deformation can be initiated within the grains, at the GBs, and from the GB triple junction pores. The deformability of the individual grains is found to be dependent on the number of cycles, as also independently evidenced on single-crystal SrTiO3 with representative surface orientations (001), (011), and (111). We also identify a grain-size-dependent plastic deformation. |
| Uncontrolled Keywords: | cyclic indentation, dislocation, plasticity, strontium titanate, surface deformation |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials |
| Date Deposited: | 04 Jul 2024 11:29 |
| Last Modified: | 20 Nov 2024 11:02 |
| PPN: | 519579518 |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
Available Versions of this Item
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Near‐surface plastic deformation in polycrystalline SrTiO₃ via room‐temperature cyclic Brinell indentation. (deposited 19 Nov 2024 12:30)
- Near-surface plastic deformation in polycrystalline SrTiO3 via room-temperature cyclic Brinell indentation. (deposited 04 Jul 2024 11:29) [Currently Displayed]
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