Analysis of the microstructure and properties of friction stir weld zones in the Al 2139-T8 alloy

Tomoko Sano, Uchechi Okeke, Jian Yu, Carl Boehlert, Chian Fong Yen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The welding process introduces heat, plastic deformation, and chemical variation into the weld joints and modifies the microstructure, strength, and ductility of the welded region. Samples from two plates of Al 2139-T8 alloys welded together by friction stir welding (FSW) were examined. The microstructure of the stir zone (SZ), thermomechanical affected zone (TMAZ), and the unaffected base alloy were evaluated by scanning electron microscopy (SEM) and electron backscattered diffraction. The deformation and quasi-static tensile behavior of the samples from the SZ, TMAZ, and unaffected base alloy were examined by in-situ tensile experiments in the SEM, at room temperature and at 300°C. The SZ samples showed higher elongation to failure and the unaffected base alloy exhibited the least amount of elongation. The ultimate tensile strength was determined to be lower in the TMAZ, and the yield strength increased away from the FSW region. The higher temperature tensile experiments showed a significant reduction in strength. The full results of the effect of the FSW on the Al2139-T8 microstructure and tensile behavior will be discussed in detail.

LanguageEnglish (US)
Title of host publicationTMS Annual Meeting
PublisherMinerals, Metals and Materials Society
Pages547-555
Number of pages9
ISBN (Print)9781118889725
StatePublished - 2014
Event143rd Annual Meeting and Exhibition, TMS 2014 - San Diego, CA, United States
Duration: Feb 16 2014Feb 20 2014

Other

Other143rd Annual Meeting and Exhibition, TMS 2014
CountryUnited States
CitySan Diego, CA
Period2/16/142/20/14

Profile

friction stir welding
Friction stir welding
Welds
friction
Friction
microstructure
Microstructure
elongation
Elongation
process heat
Scanning electron microscopy
scanning electron microscopy
yield strength
ductility
welding
Electron diffraction
tensile strength
plastic deformation
Yield stress
Ductility

Keywords

  • Al 2139
  • Friction stir weld
  • In-situ characterization

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

Sano, T., Okeke, U., Yu, J., Boehlert, C., & Yen, C. F. (2014). Analysis of the microstructure and properties of friction stir weld zones in the Al 2139-T8 alloy. In TMS Annual Meeting (pp. 547-555). Minerals, Metals and Materials Society.

Analysis of the microstructure and properties of friction stir weld zones in the Al 2139-T8 alloy. / Sano, Tomoko; Okeke, Uchechi; Yu, Jian; Boehlert, Carl; Yen, Chian Fong.

TMS Annual Meeting. Minerals, Metals and Materials Society, 2014. p. 547-555.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sano, T, Okeke, U, Yu, J, Boehlert, C & Yen, CF 2014, Analysis of the microstructure and properties of friction stir weld zones in the Al 2139-T8 alloy. in TMS Annual Meeting. Minerals, Metals and Materials Society, pp. 547-555, 143rd Annual Meeting and Exhibition, TMS 2014, San Diego, CA, United States, 2/16/14.
Sano T, Okeke U, Yu J, Boehlert C, Yen CF. Analysis of the microstructure and properties of friction stir weld zones in the Al 2139-T8 alloy. In TMS Annual Meeting. Minerals, Metals and Materials Society. 2014. p. 547-555.
Sano, Tomoko ; Okeke, Uchechi ; Yu, Jian ; Boehlert, Carl ; Yen, Chian Fong. / Analysis of the microstructure and properties of friction stir weld zones in the Al 2139-T8 alloy. TMS Annual Meeting. Minerals, Metals and Materials Society, 2014. pp. 547-555
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