Effect of microstructure on fracture limit strain of pseudo-plane strain deformation in friction stir welded Al alloy 5052

Yutaka Sato, Yusuke Sugiura, Hiroyuki Kokawa

Research output: Contribution to journalArticlepeer-review

Abstract

The automotive industry is required to produce lightweight, fuel-efficient vehicles. The development and application of tailor welded blanks of Al alloys is a logical extension of the vehicle weight reduction process. Friction stir welding (FSW) is a favorable joining process for the production of tailor welded blanks, because it can make defect-free welds with a homogeneous microstructure in Al alloys. In this study, a relationship between the fracture limit strain of a pseudo-plane strain deformation and the microstructure was examined in a friction stir welded AA5052 sheet to evaluate the formability of friction stir welded Al alloy for automotive applications. The fracture limit strain increased with increasing subgrain size in the stir zone. This study suggests that both larger grain size and lower density of dislocations and sub-boundaries are required as microstructural features to obtain the excellent plane strain value in the stir zone of AA5052.

Original languageEnglish
Pages (from-to)15-22
Number of pages8
JournalKeikinzoku Yosetsu/Journal of Light Metal Welding and Construction
Volume44
Issue number5
Publication statusPublished - 2006 May 1

Keywords

  • Al alloys
  • Formability
  • Friction stir welding
  • Microstructure

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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