Fatigue Performance of Friction-Stir-Welded Al-Mg-Sc Alloy
| Autor: | Daria Zhemchuzhnikova, Rustam Kaibyshev, Sergey Mironov |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Structural material Alloy Metallurgy Metals and Alloys 02 engineering and technology Welding engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Fatigue limit law.invention Mechanics of Materials law 0103 physical sciences Metallic materials engineering Dislocation 0210 nano-technology Joint (geology) |
| Zdroj: | Metallurgical and Materials Transactions A. 48:150-158 |
| ISSN: | 1543-1940 1073-5623 |
| DOI: | 10.1007/s11661-016-3843-6 |
| Popis: | Fatigue behavior of a friction-stir-welded Al-Mg-Sc alloy was examined in cast and hot-rolled conditions. In both cases, the joints failed in the base material region and therefore the joint efficiency was 100 pct. The specimens machined entirely from the stir zone demonstrated fatigue strength superior to that of the base material in both preprocessed tempers. It was shown that the excellent fatigue performance of friction-stir joints was attributable to the ultra-fine-grained microstructure, the low dislocation density evolved in the stir zone, and the preservation of Al3Sc coherent dispersoids during welding. The formation of such structure hinders the initiation and growth of fatigue microcracks that provides superior fatigue performance of friction-stir welds. |
| Databáze: | OpenAIRE |
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