Evolution of microstructure and mechanical properties in naturally aged 7050 and 7075 Al friction stir welds
| Autor: | Murray W. Mahoney, Mike Calabrese, Christian B. Fuller, Leanna Micona |
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| Rok vydání: | 2010 |
| Předmět: |
Heat-affected zone
Materials science Mechanical Engineering Metallurgy Alloy Welding engineering.material Condensed Matter Physics Microstructure law.invention Mechanics of Materials law Volume fraction Ultimate tensile strength engineering Friction stir welding General Materials Science Guinier–Preston zone |
| Zdroj: | Materials Science and Engineering: A. 527:2233-2240 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2009.11.057 |
| Popis: | The microstructural and mechanical property evolution of friction stir welded 7050-T7651 and 7075-T651 Al alloys were examined as a function of room temperature (natural) aging for up to 67,920 h. During the range of aging times studied, transverse tensile strengths continuously increased, and are still increasing, with improvements of 24% and 29% measured for the 7050-T7651 and 7075-T651 Al alloy friction stir welds, respectively. Microstructural evolution within the weld nugget and heat-affected zone was evaluated with both transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). Formation of a high volume fraction of GP(II) zones produced a majority of the strength improvement within the weld nugget and HAZ regions. The rational for the microstructural changes are discussed in light of the mechanical properties. |
| Databáze: | OpenAIRE |
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