Effects of solution time and cooling rate on microstructures and mechanical properties of 2219 Al alloy for a larger spun thin-wall ellipsoidal head
Autor: | Dan-yang Liu, Dao-Guang He, Xu-Hao Zhu, Yong-Cheng Lin, Qiao Wu, Xin-He Li |
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Rok vydání: | 2020 |
Předmět: |
lcsh:TN1-997
Materials science Spinning Alloy Mechanical properties 02 engineering and technology engineering.material 01 natural sciences Biomaterials 0103 physical sciences Ultimate tensile strength Water cooling Composite material lcsh:Mining engineering. Metallurgy 010302 applied physics Precipitation (chemistry) Cooling rate Solution time Metals and Alloys 021001 nanoscience & nanotechnology Microstructure Ellipsoid Surfaces Coatings and Films Ceramics and Composites engineering Head (vessel) Microstructures 0210 nano-technology |
Zdroj: | Journal of Materials Research and Technology, Vol 9, Iss 3, Pp 3566-3577 (2020) |
ISSN: | 2238-7854 |
Popis: | The effects of solution time and cooling rate on microstructures and mechanical properties of 2219 Al alloy for a larger spun thin-wall ellipsoidal head are investigated. It is found that the Al2Cu phases are greatly affected by the solution time. The content of Al2Cu phases first decreases and then stabilizes with increasing the solution time. Moreover, the effects of solution time on the transformation of precipitates are obvious. As the solution time is increased from 35 min to 60 min, almost all the precipitates transfer from GP zones to θ′′ phases. When the solution time is further increased to 110 min, some θ′ phases appear. Meanwhile, the size of θ′′ phases increases, while the density of θ′′ phases drops. These microstructure changes greatly influence the mechanical properties, i.e., the hardness and tensile strengths first increase and then slightly decrease with the continuous increase of the solution time. In addition, if the cooling rate is decreased, the precipitation of coarse equilibrium θ phases is enhanced, but the precipitation of strengthening phases (θ′′, θ′) is restricted. It significantly deteriorates the mechanical properties. Based on the comprehensive analysis, the suitable solution time and cooling method are about 60 min and water cooling. |
Databáze: | OpenAIRE |
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