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Open Access Effects of Aging Treatments on Microstructure and Micro-hardness of 2219-T87 Welds

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  The effects of post-weld aging treatment on microstructure and micro-hardness of aluminum alloy grade 2219 welds are presented. The microstructure including the precipitates distribution and morphology was observed by transmission electron microscopy (TEM) and micro-hardness was measured to characterize the different micro-areas across the weld. The results show that different post-weld aging temperatures lead to variations in microstructure and micro-hardness across the weld. Full reversion area (RA) in the heat affected zone (HAZ)is the most sensitive to the aging process. Micro-hardness in this area shows obvious improvement when it is processed at low aging temperatures, and the maximum increase is achieved at 160. The micro-hardness in the weld metal (WM) remains relatively stable. The maximum increase is achieved at 210. The over-aged area (OA) shows a very limited increase in micro-hardness and the maximum value is obtained at 160. TEM observation revealed that the changes in micro-hardness of micro-areas across the weld are mainly related with the precipitate evolution during the aging process.
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Keywords: 2219 aluminum alloy; micro-hardness; microstructure; post-weld aging treatment; transmission electron microscopy

Document Type: Research Article

Publication date: June 15, 2015

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  • Journal of Aeronautical Materials, founded in 1981, is sponsored by Chinese Society of Aeronautics and Astronautics, and edited and published by editiorial board of Journal of Aeronautical Materials,AVIC Beijing Institute of Aeronautical Material(BIAM).It has been indexed in Scopus (Holland), INSPEC (U.K.), AJ (Russia), CA (US) and UPD (US). Journal of Aeronutical Materials is devoted to reporting new and original experimental and theoretical basic research of aeronautical materials, such as composite design,technology,testing and charaacterizing, and so on.
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