Dislocation Density-Based Modeling of Dynamic Recrystallized Microstructure and Process in Friction Stir Spot Welding of AA6082

Zeng Gao, Jianguang Feng, Zhenjiang Wang, Jitai T. Niu, Christof Sommitsch

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This work mainly focuses on a series of microstructural analysis and predictions regarding
dynamic recrystallization behavior, change in grain size, and dislocation density. Additionally,
this study includes the shape prediction of the stir zone formed during friction stir spot welding.
Microstructure analysis of the joint reveals that the mechanism of dynamic recrystallization in the
stir zone is geometric dynamic recrystallization. A set of constitutive equations based on dislocation
density is established and implemented in DEFORM-3D software to predict dynamic recrystallization
during friction stir spot welding of AA6082. From the experimental and model predictions, it is
observed that the original microstructure in the stir zone is completely replaced by a recrystallized
fine grained microstructure. There is satisfactory agreement between the experimental grain size
and the simulated results. In addition, the predicted shape of the stir zone fits quite well with the
experimental shape as well.
Original languageEnglish
Article number672
JournalMetals
Volume9
Issue number6
DOIs
Publication statusPublished - 2019

Keywords

    ASJC Scopus subject areas

    • Materials Science(all)

    Fields of Expertise

    • Advanced Materials Science

    Cite this

    Dislocation Density-Based Modeling of Dynamic Recrystallized Microstructure and Process in Friction Stir Spot Welding of AA6082. / Gao, Zeng; Feng, Jianguang; Wang, Zhenjiang; Niu, Jitai T.; Sommitsch, Christof.

    In: Metals, Vol. 9, No. 6, 672, 2019.

    Research output: Contribution to journalArticleResearchpeer-review

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    abstract = "This work mainly focuses on a series of microstructural analysis and predictions regardingdynamic recrystallization behavior, change in grain size, and dislocation density. Additionally,this study includes the shape prediction of the stir zone formed during friction stir spot welding.Microstructure analysis of the joint reveals that the mechanism of dynamic recrystallization in thestir zone is geometric dynamic recrystallization. A set of constitutive equations based on dislocationdensity is established and implemented in DEFORM-3D software to predict dynamic recrystallizationduring friction stir spot welding of AA6082. From the experimental and model predictions, it isobserved that the original microstructure in the stir zone is completely replaced by a recrystallizedfine grained microstructure. There is satisfactory agreement between the experimental grain sizeand the simulated results. In addition, the predicted shape of the stir zone fits quite well with theexperimental shape as well.",
    keywords = "friction stir spot welding; dynamic recrystallization; microstructure evolution; aluminum alloy",
    author = "Zeng Gao and Jianguang Feng and Zhenjiang Wang and Niu, {Jitai T.} and Christof Sommitsch",
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    AU - Gao, Zeng

    AU - Feng, Jianguang

    AU - Wang, Zhenjiang

    AU - Niu, Jitai T.

    AU - Sommitsch, Christof

    PY - 2019

    Y1 - 2019

    N2 - This work mainly focuses on a series of microstructural analysis and predictions regardingdynamic recrystallization behavior, change in grain size, and dislocation density. Additionally,this study includes the shape prediction of the stir zone formed during friction stir spot welding.Microstructure analysis of the joint reveals that the mechanism of dynamic recrystallization in thestir zone is geometric dynamic recrystallization. A set of constitutive equations based on dislocationdensity is established and implemented in DEFORM-3D software to predict dynamic recrystallizationduring friction stir spot welding of AA6082. From the experimental and model predictions, it isobserved that the original microstructure in the stir zone is completely replaced by a recrystallizedfine grained microstructure. There is satisfactory agreement between the experimental grain sizeand the simulated results. In addition, the predicted shape of the stir zone fits quite well with theexperimental shape as well.

    AB - This work mainly focuses on a series of microstructural analysis and predictions regardingdynamic recrystallization behavior, change in grain size, and dislocation density. Additionally,this study includes the shape prediction of the stir zone formed during friction stir spot welding.Microstructure analysis of the joint reveals that the mechanism of dynamic recrystallization in thestir zone is geometric dynamic recrystallization. A set of constitutive equations based on dislocationdensity is established and implemented in DEFORM-3D software to predict dynamic recrystallizationduring friction stir spot welding of AA6082. From the experimental and model predictions, it isobserved that the original microstructure in the stir zone is completely replaced by a recrystallizedfine grained microstructure. There is satisfactory agreement between the experimental grain sizeand the simulated results. In addition, the predicted shape of the stir zone fits quite well with theexperimental shape as well.

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