Effect of Revolutionary Pitch on Interface Microstructure and Mechanical Behavior of Friction Stir Lap Welds of AA6082-T6 to Galvanized DP800
Friction stir lap welding of 1.5-mm thick 6082-T6 aluminum alloy to 2-mm thick galvanized DP800 steel (Zn-coated) was carried out. Optimal welding conditions were obtained aiming to defect-free joints with good mechanical properties. The interfacial intermetallic compounds (IMCs) at the stir zone an...
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| Format: | Article |
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MDPI AG
2018-11-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/8/11/925 |
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| author | Shuhan Li Yuhua Chen Jidong Kang Babak Shalchi Amirkhiz Francois Nadeau |
| author_facet | Shuhan Li Yuhua Chen Jidong Kang Babak Shalchi Amirkhiz Francois Nadeau |
| author_sort | Shuhan Li |
| collection | DOAJ |
| description | Friction stir lap welding of 1.5-mm thick 6082-T6 aluminum alloy to 2-mm thick galvanized DP800 steel (Zn-coated) was carried out. Optimal welding conditions were obtained aiming to defect-free joints with good mechanical properties. The interfacial intermetallic compounds (IMCs) at the stir zone and hook zone were characterized under different revolutionary pitches. With a revolutionary pitch of 1.0 mm/rev, maximum joint strength reached 71% of that of the aluminum alloy. In the meantime, the average thickness of IMC layer is less than 1 μm; Al<sub>3.2</sub>Fe in the Al-rich side and Al<sub>5</sub>Fe<sub>2</sub> in the Fe-rich side at the interfaces of stir zone while Al<sub>6</sub>Fe and nanocrystalline close to Al<sub>3.2</sub>Fe at the interface of the hook zone. At a relatively lower revolutionary pitch (0.5 mm/rev), Zn was found with the aggregation of Si and Mn at the hook-zone interface, leading to the generation of Al-Fe-Si phase thus decreasing the thickness of the IMC layer. In the stir zone, the revolutionary pitch has a significant influence on the interfacial microstructures. The interfacial IMC layer at 1.0 mm/rev is simple and flat, but the one at 0.5 mm/rev becomes thicker and more complex. Stir zone aluminum under different revolutionary pitches is similar in microhardness and tensile behavior. The mechanical response of joints was modeled based on linear mixture law with an iso-strain assumption and neglection of the IMC layer. The modeling results are in good agreement with the experimental ones indicating the resultant interfaces act as good as the good boundaries between dissimilar Al/steel joints. |
| first_indexed | 2024-12-23T05:53:03Z |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-23T05:53:03Z |
| publishDate | 2018-11-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-6c14c357a36b46248a8cf6dcd56a826a2022-12-21T17:57:53ZengMDPI AGMetals2075-47012018-11-0181192510.3390/met8110925met8110925Effect of Revolutionary Pitch on Interface Microstructure and Mechanical Behavior of Friction Stir Lap Welds of AA6082-T6 to Galvanized DP800Shuhan Li0Yuhua Chen1Jidong Kang2Babak Shalchi Amirkhiz3Francois Nadeau4CanmetMATERIALS, Natural Resources Canada, 183 Longwood Road South, Hamilton, ON L8P 0A5, CanadaSchool of Aerospace Manufacturing Engineering, Nanchang Hangkong University, 696 Fenghe Road South, Nanchang 330063, ChinaCanmetMATERIALS, Natural Resources Canada, 183 Longwood Road South, Hamilton, ON L8P 0A5, CanadaCanmetMATERIALS, Natural Resources Canada, 183 Longwood Road South, Hamilton, ON L8P 0A5, CanadaNational Research Council of Canada (NRC), Saguenay, QC G7H 8C3, CanadaFriction stir lap welding of 1.5-mm thick 6082-T6 aluminum alloy to 2-mm thick galvanized DP800 steel (Zn-coated) was carried out. Optimal welding conditions were obtained aiming to defect-free joints with good mechanical properties. The interfacial intermetallic compounds (IMCs) at the stir zone and hook zone were characterized under different revolutionary pitches. With a revolutionary pitch of 1.0 mm/rev, maximum joint strength reached 71% of that of the aluminum alloy. In the meantime, the average thickness of IMC layer is less than 1 μm; Al<sub>3.2</sub>Fe in the Al-rich side and Al<sub>5</sub>Fe<sub>2</sub> in the Fe-rich side at the interfaces of stir zone while Al<sub>6</sub>Fe and nanocrystalline close to Al<sub>3.2</sub>Fe at the interface of the hook zone. At a relatively lower revolutionary pitch (0.5 mm/rev), Zn was found with the aggregation of Si and Mn at the hook-zone interface, leading to the generation of Al-Fe-Si phase thus decreasing the thickness of the IMC layer. In the stir zone, the revolutionary pitch has a significant influence on the interfacial microstructures. The interfacial IMC layer at 1.0 mm/rev is simple and flat, but the one at 0.5 mm/rev becomes thicker and more complex. Stir zone aluminum under different revolutionary pitches is similar in microhardness and tensile behavior. The mechanical response of joints was modeled based on linear mixture law with an iso-strain assumption and neglection of the IMC layer. The modeling results are in good agreement with the experimental ones indicating the resultant interfaces act as good as the good boundaries between dissimilar Al/steel joints.https://www.mdpi.com/2075-4701/8/11/925Al/steel dissimilar materialsfriction stir weldinginterfaceintermetallic compounds |
| spellingShingle | Shuhan Li Yuhua Chen Jidong Kang Babak Shalchi Amirkhiz Francois Nadeau Effect of Revolutionary Pitch on Interface Microstructure and Mechanical Behavior of Friction Stir Lap Welds of AA6082-T6 to Galvanized DP800 Metals Al/steel dissimilar materials friction stir welding interface intermetallic compounds |
| title | Effect of Revolutionary Pitch on Interface Microstructure and Mechanical Behavior of Friction Stir Lap Welds of AA6082-T6 to Galvanized DP800 |
| title_full | Effect of Revolutionary Pitch on Interface Microstructure and Mechanical Behavior of Friction Stir Lap Welds of AA6082-T6 to Galvanized DP800 |
| title_fullStr | Effect of Revolutionary Pitch on Interface Microstructure and Mechanical Behavior of Friction Stir Lap Welds of AA6082-T6 to Galvanized DP800 |
| title_full_unstemmed | Effect of Revolutionary Pitch on Interface Microstructure and Mechanical Behavior of Friction Stir Lap Welds of AA6082-T6 to Galvanized DP800 |
| title_short | Effect of Revolutionary Pitch on Interface Microstructure and Mechanical Behavior of Friction Stir Lap Welds of AA6082-T6 to Galvanized DP800 |
| title_sort | effect of revolutionary pitch on interface microstructure and mechanical behavior of friction stir lap welds of aa6082 t6 to galvanized dp800 |
| topic | Al/steel dissimilar materials friction stir welding interface intermetallic compounds |
| url | https://www.mdpi.com/2075-4701/8/11/925 |
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