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High-temperature deformation and enhanced ductility of friction stir processed-7010 Aluminum Alloy
Research highlights ► Study the effect of FSP on microstructure, ductility changes and the mechanical behavior of AA 7010. ► Elucidate the deformation mechanism of FSP 7010 in the temperature range 703–753K. ► Compared to the unprocessed AA 7010, FSP is an effective means for ductility enhancement. ► The true Qa is independent to strain rate and equals 120kJ/mol; close to that for diffusion of Mg in Al. ► The threshold stress is function of temperature where it decreases with increasing temperature.
Abstract In the present study the microstructural and high-temperature mechanical properties of 7010 Aluminum Alloy (AA) resulting from friction stir processing (FSP) were analyzed and compared to unprocessed material. The sheets were processed perpendicularly to the rolling direction that resulted into fine-grained microstructure having the size of about 7μm. The high-temperature deformation characteristics and mechanical properties of the processed material were studied using hot tensile tests at temperatures of 703, 723 and 753K and at different strain rates in the range of 1×10−2–1×10−4 s−1. Correlation between the flow stress σ and strain rate and temperature, T gave an apparent stress exponent na of 5 and apparent activation energy Qa of 260kJ/mol. The high value of Qa was attributed to the presence of threshold stress under the present experimental conditions.
High-temperature deformation and enhanced ductility of friction stir processed-7010 Aluminum Alloy
Research highlights ► Study the effect of FSP on microstructure, ductility changes and the mechanical behavior of AA 7010. ► Elucidate the deformation mechanism of FSP 7010 in the temperature range 703–753K. ► Compared to the unprocessed AA 7010, FSP is an effective means for ductility enhancement. ► The true Qa is independent to strain rate and equals 120kJ/mol; close to that for diffusion of Mg in Al. ► The threshold stress is function of temperature where it decreases with increasing temperature.
Abstract In the present study the microstructural and high-temperature mechanical properties of 7010 Aluminum Alloy (AA) resulting from friction stir processing (FSP) were analyzed and compared to unprocessed material. The sheets were processed perpendicularly to the rolling direction that resulted into fine-grained microstructure having the size of about 7μm. The high-temperature deformation characteristics and mechanical properties of the processed material were studied using hot tensile tests at temperatures of 703, 723 and 753K and at different strain rates in the range of 1×10−2–1×10−4 s−1. Correlation between the flow stress σ and strain rate and temperature, T gave an apparent stress exponent na of 5 and apparent activation energy Qa of 260kJ/mol. The high value of Qa was attributed to the presence of threshold stress under the present experimental conditions.
High-temperature deformation and enhanced ductility of friction stir processed-7010 Aluminum Alloy
El Rayes, Magdy M. (author) / El Danaf, Ehab A. (author) / Soliman, Mahmoud S. (author)
2010-12-01
7 pages
Article (Journal)
Electronic Resource
English
High-temperature deformation and enhanced ductility of friction stir processed-7010 Aluminum Alloy
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