Improving mechanical properties of friction stir welded AA2024-T3 joints by using a composite backplate

Z. H. Zhang; W. Y. Li; Y. Feng; J. L. Li; Y. J. Chao

doi:10.1016/j.msea.2014.01.047

Improving mechanical properties of friction stir welded AA2024-T3 joints by using a composite backplate

Z. H. Zhang, W. Y. Li, Y. Feng, J. L. Li, Y. J. Chao

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

During friction stir welding (FSW) of AA2024-T3 sheets, composite backing plates (CBP) made out of the combination of pure copper and medium carbon steel were employed aiming at enhancing the joint mechanical properties. Three different CBP designs were used. Microstructure and mechanical properties of the welded joints were examined. Results reveal that the grains under CBP have been noticeably refined compared to those under a monolithic steel backing plate typically used in FSW. In addition, using the CBP effectively prevents the dissolution of Guinier-Preston-Bagaryatskii (GPB) zones in the HAZ. Superior strength-ductility synergy was obtained under CBP-3. Those joints exhibit more high-angle grain boundaries, ultrafine grains of about 980. nm, more GPB zones and optimum hardness distribution, resulting in a tensile strength of 442. MPa and an elongation of as much as 16.2%.

Original language	English
Pages (from-to)	312-318
Number of pages	7
Journal	Materials Science and Engineering: A
Volume	598
DOIs	https://doi.org/10.1016/j.msea.2014.01.047
State	Published - 26 Mar 2014

Keywords

Composite backing plate
Friction stir welding
Mechanical properties
Microstructure

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10.1016/j.msea.2014.01.047

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title = "Improving mechanical properties of friction stir welded AA2024-T3 joints by using a composite backplate",

abstract = "During friction stir welding (FSW) of AA2024-T3 sheets, composite backing plates (CBP) made out of the combination of pure copper and medium carbon steel were employed aiming at enhancing the joint mechanical properties. Three different CBP designs were used. Microstructure and mechanical properties of the welded joints were examined. Results reveal that the grains under CBP have been noticeably refined compared to those under a monolithic steel backing plate typically used in FSW. In addition, using the CBP effectively prevents the dissolution of Guinier-Preston-Bagaryatskii (GPB) zones in the HAZ. Superior strength-ductility synergy was obtained under CBP-3. Those joints exhibit more high-angle grain boundaries, ultrafine grains of about 980. nm, more GPB zones and optimum hardness distribution, resulting in a tensile strength of 442. MPa and an elongation of as much as 16.2%.",

keywords = "Composite backing plate, Friction stir welding, Mechanical properties, Microstructure",

author = "Zhang, {Z. H.} and Li, {W. Y.} and Y. Feng and Li, {J. L.} and Chao, {Y. J.}",

year = "2014",

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doi = "10.1016/j.msea.2014.01.047",

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volume = "598",

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journal = "Materials Science and Engineering: A",

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T1 - Improving mechanical properties of friction stir welded AA2024-T3 joints by using a composite backplate

AU - Zhang, Z. H.

AU - Li, W. Y.

AU - Feng, Y.

AU - Li, J. L.

AU - Chao, Y. J.

PY - 2014/3/26

Y1 - 2014/3/26

N2 - During friction stir welding (FSW) of AA2024-T3 sheets, composite backing plates (CBP) made out of the combination of pure copper and medium carbon steel were employed aiming at enhancing the joint mechanical properties. Three different CBP designs were used. Microstructure and mechanical properties of the welded joints were examined. Results reveal that the grains under CBP have been noticeably refined compared to those under a monolithic steel backing plate typically used in FSW. In addition, using the CBP effectively prevents the dissolution of Guinier-Preston-Bagaryatskii (GPB) zones in the HAZ. Superior strength-ductility synergy was obtained under CBP-3. Those joints exhibit more high-angle grain boundaries, ultrafine grains of about 980. nm, more GPB zones and optimum hardness distribution, resulting in a tensile strength of 442. MPa and an elongation of as much as 16.2%.

AB - During friction stir welding (FSW) of AA2024-T3 sheets, composite backing plates (CBP) made out of the combination of pure copper and medium carbon steel were employed aiming at enhancing the joint mechanical properties. Three different CBP designs were used. Microstructure and mechanical properties of the welded joints were examined. Results reveal that the grains under CBP have been noticeably refined compared to those under a monolithic steel backing plate typically used in FSW. In addition, using the CBP effectively prevents the dissolution of Guinier-Preston-Bagaryatskii (GPB) zones in the HAZ. Superior strength-ductility synergy was obtained under CBP-3. Those joints exhibit more high-angle grain boundaries, ultrafine grains of about 980. nm, more GPB zones and optimum hardness distribution, resulting in a tensile strength of 442. MPa and an elongation of as much as 16.2%.

KW - Composite backing plate

KW - Friction stir welding

KW - Mechanical properties

KW - Microstructure

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DO - 10.1016/j.msea.2014.01.047

M3 - 文章

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SN - 0921-5093

VL - 598

SP - 312

EP - 318

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Improving mechanical properties of friction stir welded AA2024-T3 joints by using a composite backplate

Abstract

Keywords

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