X-ray and neutron diffraction measurements of dislocation density and subgrain size in a friction-stir-welded aluminum alloy

Wanchuck Woo, T. Ungár, Zhili Feng, Edward Kenik, Bjørn Clausen

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

The dislocation density and subgrain size were determined in the base material and friction-stir welds of 6061-T6 aluminum alloy. High-resolution X-ray diffraction measurement was performed in the base material. The result of the line profile analysis of the X-ray diffraction peak shows that the dislocation density is about 4.5 × 1014 m-2 and the subgrain size is about 200 nm. Meanwhile, neutron diffraction measurements have been performed to observe the diffraction peaks during friction-stir welding (FSW). The deep penetration capability of the neutron enables us to measure the peaks from the midplane of the Al plate underneath the tool shoulder of the friction-stir welds. The peak broadening analysis result using the Williamson-Hall method shows the dislocation density of about 3.2 × 1015 m-2 and subgrain size of about 160 nm. The significant increase of the dislocation density is likely due to the severe plastic deformation during FSW. This study provides an insight into understanding the transient behavior of the microstructure under severe thermomechanical deformation.

Original languageEnglish
Pages (from-to)1210-1216
Number of pages7
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume41
Issue number5
DOIs
Publication statusPublished - May 2010

Fingerprint

Friction stir welding
Neutron diffraction
aluminum alloys
neutron diffraction
Aluminum alloys
Welds
friction
Friction
friction stir welding
X ray diffraction
diffraction
Plastic deformation
Neutrons
x rays
Diffraction
Microstructure
shoulders
plastic deformation
penetration
neutrons

ASJC Scopus subject areas

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

Cite this

X-ray and neutron diffraction measurements of dislocation density and subgrain size in a friction-stir-welded aluminum alloy. / Woo, Wanchuck; Ungár, T.; Feng, Zhili; Kenik, Edward; Clausen, Bjørn.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 41, No. 5, 05.2010, p. 1210-1216.

Research output: Contribution to journalArticle

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