Atomic Force Microscopy Study of Discrete Dislocation Pile-ups at Grain Boundaries in Bi-Crystalline Micro-Pillars
Compression tests at low strains were performed to theoretically analyze the effects of anisotropic elasticity, misorientation, grain boundary (GB) stiffness, interfacial dislocations, free surfaces, and critical force on dislocation pile-ups in micro-sized Face-Centered Cubic (FCC) Nickel (Ni) and...
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MDPI AG
2020-05-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/10/5/411 |
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| author | Xiaolei Chen Thiebaud Richeton Christian Motz Stéphane Berbenni |
| author_facet | Xiaolei Chen Thiebaud Richeton Christian Motz Stéphane Berbenni |
| author_sort | Xiaolei Chen |
| collection | DOAJ |
| description | Compression tests at low strains were performed to theoretically analyze the effects of anisotropic elasticity, misorientation, grain boundary (GB) stiffness, interfacial dislocations, free surfaces, and critical force on dislocation pile-ups in micro-sized Face-Centered Cubic (FCC) Nickel (Ni) and <inline-formula> <math display="inline"> <semantics> <mi>α</mi> </semantics> </math> </inline-formula>-Brass bi-crystals. The spatial variations of slip heights due to localized slip bands terminating at GB were measured by Atomic Force Microscopy (AFM) to determine the Burgers vector distributions in the dislocation pile-ups. These distributions were then simulated by discrete pile-up micromechanical calculations in anisotropic bi-crystals consistent with the experimentally measured material parameters. The computations were based on the image decomposition method considering the effects of interphase GB and free surfaces in multilayered materials. For Ni and <inline-formula> <math display="inline"> <semantics> <mi>α</mi> </semantics> </math> </inline-formula>-Brass, it was found that the best predicted step height spatial profiles were obtained considering anisotropic elasticity, free surface effects, a homogeneous external stress and a certain critical force in the material to equilibrate the dislocation pile-ups. |
| first_indexed | 2024-03-10T19:42:37Z |
| format | Article |
| id | doaj.art-3a261de485f54ab39005ef6441aaf3af |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T19:42:37Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-3a261de485f54ab39005ef6441aaf3af2023-11-20T01:04:54ZengMDPI AGCrystals2073-43522020-05-0110541110.3390/cryst10050411Atomic Force Microscopy Study of Discrete Dislocation Pile-ups at Grain Boundaries in Bi-Crystalline Micro-PillarsXiaolei Chen0Thiebaud Richeton1Christian Motz2Stéphane Berbenni3Université de Lorraine, CNRS, Arts et Métiers ParisTech, LEM3, F-57000 Metz, FranceUniversité de Lorraine, CNRS, Arts et Métiers ParisTech, LEM3, F-57000 Metz, FranceDepartment of Materials Science and Engineering, Saarland University, 66123 Saarbrücken, GermanyUniversité de Lorraine, CNRS, Arts et Métiers ParisTech, LEM3, F-57000 Metz, FranceCompression tests at low strains were performed to theoretically analyze the effects of anisotropic elasticity, misorientation, grain boundary (GB) stiffness, interfacial dislocations, free surfaces, and critical force on dislocation pile-ups in micro-sized Face-Centered Cubic (FCC) Nickel (Ni) and <inline-formula> <math display="inline"> <semantics> <mi>α</mi> </semantics> </math> </inline-formula>-Brass bi-crystals. The spatial variations of slip heights due to localized slip bands terminating at GB were measured by Atomic Force Microscopy (AFM) to determine the Burgers vector distributions in the dislocation pile-ups. These distributions were then simulated by discrete pile-up micromechanical calculations in anisotropic bi-crystals consistent with the experimentally measured material parameters. The computations were based on the image decomposition method considering the effects of interphase GB and free surfaces in multilayered materials. For Ni and <inline-formula> <math display="inline"> <semantics> <mi>α</mi> </semantics> </math> </inline-formula>-Brass, it was found that the best predicted step height spatial profiles were obtained considering anisotropic elasticity, free surface effects, a homogeneous external stress and a certain critical force in the material to equilibrate the dislocation pile-ups.https://www.mdpi.com/2073-4352/10/5/411micromechanical testingmicro-pillarbi-crystaldiscrete dislocation pile-upgrain boundaryfree surface |
| spellingShingle | Xiaolei Chen Thiebaud Richeton Christian Motz Stéphane Berbenni Atomic Force Microscopy Study of Discrete Dislocation Pile-ups at Grain Boundaries in Bi-Crystalline Micro-Pillars Crystals micromechanical testing micro-pillar bi-crystal discrete dislocation pile-up grain boundary free surface |
| title | Atomic Force Microscopy Study of Discrete Dislocation Pile-ups at Grain Boundaries in Bi-Crystalline Micro-Pillars |
| title_full | Atomic Force Microscopy Study of Discrete Dislocation Pile-ups at Grain Boundaries in Bi-Crystalline Micro-Pillars |
| title_fullStr | Atomic Force Microscopy Study of Discrete Dislocation Pile-ups at Grain Boundaries in Bi-Crystalline Micro-Pillars |
| title_full_unstemmed | Atomic Force Microscopy Study of Discrete Dislocation Pile-ups at Grain Boundaries in Bi-Crystalline Micro-Pillars |
| title_short | Atomic Force Microscopy Study of Discrete Dislocation Pile-ups at Grain Boundaries in Bi-Crystalline Micro-Pillars |
| title_sort | atomic force microscopy study of discrete dislocation pile ups at grain boundaries in bi crystalline micro pillars |
| topic | micromechanical testing micro-pillar bi-crystal discrete dislocation pile-up grain boundary free surface |
| url | https://www.mdpi.com/2073-4352/10/5/411 |
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