Elucidating the microscopic origin of electrochemical corrosion and electrical conductivity by lattice response to severe plastic deformation in Al-Mn-Si alloy
| Autor: | Hesam Pouraliakbar, Mohammad Reza Jandaghi |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Alloy Intermetallic 02 engineering and technology Conductivity engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Corrosion Mechanics of Materials 0103 physical sciences engineering Dynamic recrystallization General Materials Science Crystallite Composite material Dislocation Severe plastic deformation 0210 nano-technology |
| Zdroj: | Materials Research Bulletin. 108:195-206 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2018.09.011 |
| Popis: | Al-Mn-Si specimens were underwent SPD by CGP, cold-rolling and their combined paths. Acquired OM and SEM micrographs revealed that random distribution of intermetallic precipitates beside their fragmentation under heavy imposed strains deteriorated particles’ influence on the electrochemical corrosion and inhibited pitting. Analysis of XRD patterns pointed out that post-rolling of CGPed sheets resulted in dynamic annihilation of dislocations and accordingly crystal lattice swelling (d-spacing increase) due to dynamic recrystallization. From polarization results, crystallites’ refinement along with density increment of sub-grain boundaries within structure as a consequence of SPD beside dislocation density enhancement accelerated corrosion. Outputs of four-point probe electrical conductivity examination indicated that apart from the employed processing, lattice compaction and atomic layers approach would limit the electrons’ mobility space and hence reduce the conductivity of material. In this regard, combined effects of CGP and rolling as employed dual-straining route on Al-Mn-Si alloy enhanced the electrical conductivity by d-spacing growth. |
| Databáze: | OpenAIRE |
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