Direct Characterization of the Relation between the Mechanical Response and Microstructure Evolution in Aluminum by Transmission Electron Microscopy In Situ Straining
Transmission electron microscopy in situ straining experiments of Al single crystals with different initial lattice defect densities have been performed. The as-focused ion beam (FIB)-processed pillar sample contained a high density of prismatic dislocation loops with the <111> Burgers vector,...
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MDPI AG
2021-03-01
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| author | Seiichiro Ii Takero Enami Takahito Ohmura Sadahiro Tsurekawa |
| author_facet | Seiichiro Ii Takero Enami Takahito Ohmura Sadahiro Tsurekawa |
| author_sort | Seiichiro Ii |
| collection | DOAJ |
| description | Transmission electron microscopy in situ straining experiments of Al single crystals with different initial lattice defect densities have been performed. The as-focused ion beam (FIB)-processed pillar sample contained a high density of prismatic dislocation loops with the <111> Burgers vector, while the post-annealed specimen had an almost defect-free microstructure. In both specimens, plastic deformation occurred with repetitive stress drops (∆<i>σ</i>). The stress drops were accompanied by certain dislocation motions, suggesting the dislocation avalanche phenomenon. ∆<i>σ</i> for the as-FIB Al pillar sample was smaller than that for the post-annealed Al sample. This can be considered to be because of the interaction of gliding dislocations with immobile prismatic dislocation loops introduced by the FIB. The reloading process after stress reduction was dominated by elastic behavior because the slope of the load–displacement curve for reloading was close to the Young’s modulus of Al. Microplasticity was observed during the load-recovery process, suggesting that microyielding and a dislocation avalanche repeatedly occurred, leading to intermittent plasticity as an elementary step of macroplastic deformation. |
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| id | doaj.art-cea1afb43c67467d957c3ac6cb30ad65 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T13:12:56Z |
| publishDate | 2021-03-01 |
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| spelling | doaj.art-cea1afb43c67467d957c3ac6cb30ad652023-11-21T10:37:23ZengMDPI AGMaterials1996-19442021-03-01146143110.3390/ma14061431Direct Characterization of the Relation between the Mechanical Response and Microstructure Evolution in Aluminum by Transmission Electron Microscopy In Situ StrainingSeiichiro Ii0Takero Enami1Takahito Ohmura2Sadahiro Tsurekawa3Research Center for Structural Materials, National Institute for Materials Science, Sengen 1-2-1, Tsukuba 305-0047, JapanDepartment of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto University, Kurokami 2-39-1, Kumamoto 860-8555, JapanResearch Center for Structural Materials, National Institute for Materials Science, Sengen 1-2-1, Tsukuba 305-0047, JapanDivision of Materials Science and Chemistry, Faculty of Advanced Science and Technology, Kumamoto University, Kurokami 2-39-1, Kumamoto 860-8555, JapanTransmission electron microscopy in situ straining experiments of Al single crystals with different initial lattice defect densities have been performed. The as-focused ion beam (FIB)-processed pillar sample contained a high density of prismatic dislocation loops with the <111> Burgers vector, while the post-annealed specimen had an almost defect-free microstructure. In both specimens, plastic deformation occurred with repetitive stress drops (∆<i>σ</i>). The stress drops were accompanied by certain dislocation motions, suggesting the dislocation avalanche phenomenon. ∆<i>σ</i> for the as-FIB Al pillar sample was smaller than that for the post-annealed Al sample. This can be considered to be because of the interaction of gliding dislocations with immobile prismatic dislocation loops introduced by the FIB. The reloading process after stress reduction was dominated by elastic behavior because the slope of the load–displacement curve for reloading was close to the Young’s modulus of Al. Microplasticity was observed during the load-recovery process, suggesting that microyielding and a dislocation avalanche repeatedly occurred, leading to intermittent plasticity as an elementary step of macroplastic deformation.https://www.mdpi.com/1996-1944/14/6/1431transmission electron microscopy (TEM)in situ strainingindentationdislocationplastic deformation |
| spellingShingle | Seiichiro Ii Takero Enami Takahito Ohmura Sadahiro Tsurekawa Direct Characterization of the Relation between the Mechanical Response and Microstructure Evolution in Aluminum by Transmission Electron Microscopy In Situ Straining Materials transmission electron microscopy (TEM) in situ straining indentation dislocation plastic deformation |
| title | Direct Characterization of the Relation between the Mechanical Response and Microstructure Evolution in Aluminum by Transmission Electron Microscopy In Situ Straining |
| title_full | Direct Characterization of the Relation between the Mechanical Response and Microstructure Evolution in Aluminum by Transmission Electron Microscopy In Situ Straining |
| title_fullStr | Direct Characterization of the Relation between the Mechanical Response and Microstructure Evolution in Aluminum by Transmission Electron Microscopy In Situ Straining |
| title_full_unstemmed | Direct Characterization of the Relation between the Mechanical Response and Microstructure Evolution in Aluminum by Transmission Electron Microscopy In Situ Straining |
| title_short | Direct Characterization of the Relation between the Mechanical Response and Microstructure Evolution in Aluminum by Transmission Electron Microscopy In Situ Straining |
| title_sort | direct characterization of the relation between the mechanical response and microstructure evolution in aluminum by transmission electron microscopy in situ straining |
| topic | transmission electron microscopy (TEM) in situ straining indentation dislocation plastic deformation |
| url | https://www.mdpi.com/1996-1944/14/6/1431 |
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