Aging Behavior of Aluminum Alloy 6082 Subjected to Friction Stir Processing
The present work examined the effect of artificial aging on the microstructure, texture, and hardness homogeneity in aluminum alloy AA6082 subjected to friction stir processing (FSP). Aging was applied to FSP samples at three different temperatures (150 °C, 175 °C, and 200 °C...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-08-01
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| Series: | Crystals |
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| Online Access: | http://www.mdpi.com/2073-4352/8/9/337 |
| _version_ | 1811304359424688128 |
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| author | Khaled Al-Fadhalah Fahad Asi |
| author_facet | Khaled Al-Fadhalah Fahad Asi |
| author_sort | Khaled Al-Fadhalah |
| collection | DOAJ |
| description | The present work examined the effect of artificial aging on the microstructure, texture, and hardness homogeneity in aluminum alloy AA6082 subjected to friction stir processing (FSP). Aging was applied to FSP samples at three different temperatures (150 °C, 175 °C, and 200 °C) for a period of 1 h, 6 h, and 12 h. Microstructure analysis using optical Microscopy (OM) and Electron Back-Scattered Diffraction (EBSD) indicated that FSP produced fine equiaxed grains, with an average grain size of 6.5 μm, in the stir zone (SZ) due to dynamic recrystallization. Aging was shown to result in additional grain refinement in the SZ due to the occurrence of recovery and recrystallization with either increasing aging temperature and/or aging time. An optimum average grain size of 3–4 μm was obtained in the SZ by applying aging at 175 °C. This was accompanied by an increase in the fraction of high-angle grain boundaries. FSP provided a simple shear texture with a major component of B fiber. Increasing aging temperature and/or time resulted in the formation of recrystallization texture of a Cube orientation. In addition, Vickers microhardness was evaluated for the FSP sample, indicating a softening in the SZ due to the dissolution of the hardening precipitates. Compared to other aging temperatures, aging at 175 °C resulted in maximum hardness recovery (90 Hv) to the initial value of base metal (92.5 Hv). The hardness recovery is most likely attributed to the uniform distribution of fine hardening precipitates in the SZ when increasing the aging time to 12 h. |
| first_indexed | 2024-04-13T08:05:45Z |
| format | Article |
| id | doaj.art-5fdbdb14a4fd4213968b0470defd97c3 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-04-13T08:05:45Z |
| publishDate | 2018-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-5fdbdb14a4fd4213968b0470defd97c32022-12-22T02:55:10ZengMDPI AGCrystals2073-43522018-08-018933710.3390/cryst8090337cryst8090337Aging Behavior of Aluminum Alloy 6082 Subjected to Friction Stir ProcessingKhaled Al-Fadhalah0Fahad Asi1Department of Mechanical Engineering, College of Engineering and Petroleum, Kuwait University, P.O. Box 5969, Safat 13060, KuwaitDepartment of Mechanical Engineering, College of Engineering and Petroleum, Kuwait University, P.O. Box 5969, Safat 13060, KuwaitThe present work examined the effect of artificial aging on the microstructure, texture, and hardness homogeneity in aluminum alloy AA6082 subjected to friction stir processing (FSP). Aging was applied to FSP samples at three different temperatures (150 °C, 175 °C, and 200 °C) for a period of 1 h, 6 h, and 12 h. Microstructure analysis using optical Microscopy (OM) and Electron Back-Scattered Diffraction (EBSD) indicated that FSP produced fine equiaxed grains, with an average grain size of 6.5 μm, in the stir zone (SZ) due to dynamic recrystallization. Aging was shown to result in additional grain refinement in the SZ due to the occurrence of recovery and recrystallization with either increasing aging temperature and/or aging time. An optimum average grain size of 3–4 μm was obtained in the SZ by applying aging at 175 °C. This was accompanied by an increase in the fraction of high-angle grain boundaries. FSP provided a simple shear texture with a major component of B fiber. Increasing aging temperature and/or time resulted in the formation of recrystallization texture of a Cube orientation. In addition, Vickers microhardness was evaluated for the FSP sample, indicating a softening in the SZ due to the dissolution of the hardening precipitates. Compared to other aging temperatures, aging at 175 °C resulted in maximum hardness recovery (90 Hv) to the initial value of base metal (92.5 Hv). The hardness recovery is most likely attributed to the uniform distribution of fine hardening precipitates in the SZ when increasing the aging time to 12 h.http://www.mdpi.com/2073-4352/8/9/337agingfriction stir processingaluminum alloysmicrostructuretexturehardness |
| spellingShingle | Khaled Al-Fadhalah Fahad Asi Aging Behavior of Aluminum Alloy 6082 Subjected to Friction Stir Processing Crystals aging friction stir processing aluminum alloys microstructure texture hardness |
| title | Aging Behavior of Aluminum Alloy 6082 Subjected to Friction Stir Processing |
| title_full | Aging Behavior of Aluminum Alloy 6082 Subjected to Friction Stir Processing |
| title_fullStr | Aging Behavior of Aluminum Alloy 6082 Subjected to Friction Stir Processing |
| title_full_unstemmed | Aging Behavior of Aluminum Alloy 6082 Subjected to Friction Stir Processing |
| title_short | Aging Behavior of Aluminum Alloy 6082 Subjected to Friction Stir Processing |
| title_sort | aging behavior of aluminum alloy 6082 subjected to friction stir processing |
| topic | aging friction stir processing aluminum alloys microstructure texture hardness |
| url | http://www.mdpi.com/2073-4352/8/9/337 |
| work_keys_str_mv | AT khaledalfadhalah agingbehaviorofaluminumalloy6082subjectedtofrictionstirprocessing AT fahadasi agingbehaviorofaluminumalloy6082subjectedtofrictionstirprocessing |