Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu Alloy
In this study, Al-Zn-Mg-Cu alloy was refill friction spot welded, and the precipitates, dislocation, recovery, and recrystallization characteristics were focused. In the stir zone (SZ), continues dynamic recrystallization occurs under the intense plastic deformation. All the original GP (II) zones a...
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doaj-9460a4b339ee4f9ca4f06edb388b84b92020-11-25T00:19:32ZengMDPI AGMetals2075-47012020-01-0110114510.3390/met10010145met10010145Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu AlloyYunqiang Zhao0Chunlin Dong1Chungui Wang2Shu Miao3Jinhong Tan4Yaoyong Yi5Guangdong Provincial Key Laboratory of Advanced Welding Technology, Guangdong Welding Institute (China-Ukraine E.O. Paton Institute of Welding), Guangzhou 510650, ChinaGuangdong Provincial Key Laboratory of Advanced Welding Technology, Guangdong Welding Institute (China-Ukraine E.O. Paton Institute of Welding), Guangzhou 510650, ChinaGuangdong Provincial Key Laboratory of Advanced Welding Technology, Guangdong Welding Institute (China-Ukraine E.O. Paton Institute of Welding), Guangzhou 510650, ChinaGuangdong Provincial Key Laboratory of Advanced Welding Technology, Guangdong Welding Institute (China-Ukraine E.O. Paton Institute of Welding), Guangzhou 510650, ChinaGuangdong Provincial Key Laboratory of Advanced Welding Technology, Guangdong Welding Institute (China-Ukraine E.O. Paton Institute of Welding), Guangzhou 510650, ChinaGuangdong Provincial Key Laboratory of Advanced Welding Technology, Guangdong Welding Institute (China-Ukraine E.O. Paton Institute of Welding), Guangzhou 510650, ChinaIn this study, Al-Zn-Mg-Cu alloy was refill friction spot welded, and the precipitates, dislocation, recovery, and recrystallization characteristics were focused. In the stir zone (SZ), continues dynamic recrystallization occurs under the intense plastic deformation. All the original GP (II) zones and η’ precipitates dissolved into the aluminum matrix under the welding heat input, and the stable η and E precipitates remained. In the thermo-mechanically affected zone (TMAZ), high-density dislocations and subgrains boundaries can be observed. The continued dynamic recrystallization was not activated and only dynamic recovery occurs. Sub-boundaries and high-density dislocations in this zone can be observed. In this zone, the η precipitates are coarsened and dissolution is the main evolution mechanism for the GP (II) zones and η’ precipitates. In the heat-affected zone (HAZ), no dislocation was induced and all the initial precipitates were coarsened under the welding heat input. The HAZ, the TMAZ, and the SZ constitute a soft region in the refill friction stir spot welding (RFSSW) joint, and the minimum value located at the interface between the HAZ and the TMAZ.https://www.mdpi.com/2075-4701/10/1/145refill friction stir spot weldingprecipitatedislocational-zn-mg-cu alloy |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yunqiang Zhao Chunlin Dong Chungui Wang Shu Miao Jinhong Tan Yaoyong Yi |
spellingShingle |
Yunqiang Zhao Chunlin Dong Chungui Wang Shu Miao Jinhong Tan Yaoyong Yi Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu Alloy Metals refill friction stir spot welding precipitate dislocation al-zn-mg-cu alloy |
author_facet |
Yunqiang Zhao Chunlin Dong Chungui Wang Shu Miao Jinhong Tan Yaoyong Yi |
author_sort |
Yunqiang Zhao |
title |
Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu Alloy |
title_short |
Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu Alloy |
title_full |
Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu Alloy |
title_fullStr |
Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu Alloy |
title_full_unstemmed |
Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu Alloy |
title_sort |
microstructures evolution in refill friction stir spot welding of al-zn-mg-cu alloy |
publisher |
MDPI AG |
series |
Metals |
issn |
2075-4701 |
publishDate |
2020-01-01 |
description |
In this study, Al-Zn-Mg-Cu alloy was refill friction spot welded, and the precipitates, dislocation, recovery, and recrystallization characteristics were focused. In the stir zone (SZ), continues dynamic recrystallization occurs under the intense plastic deformation. All the original GP (II) zones and η’ precipitates dissolved into the aluminum matrix under the welding heat input, and the stable η and E precipitates remained. In the thermo-mechanically affected zone (TMAZ), high-density dislocations and subgrains boundaries can be observed. The continued dynamic recrystallization was not activated and only dynamic recovery occurs. Sub-boundaries and high-density dislocations in this zone can be observed. In this zone, the η precipitates are coarsened and dissolution is the main evolution mechanism for the GP (II) zones and η’ precipitates. In the heat-affected zone (HAZ), no dislocation was induced and all the initial precipitates were coarsened under the welding heat input. The HAZ, the TMAZ, and the SZ constitute a soft region in the refill friction stir spot welding (RFSSW) joint, and the minimum value located at the interface between the HAZ and the TMAZ. |
topic |
refill friction stir spot welding precipitate dislocation al-zn-mg-cu alloy |
url |
https://www.mdpi.com/2075-4701/10/1/145 |
work_keys_str_mv |
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