Local inhomogeneity of mechanical properties in stir zone of friction stir welded AA1050 aluminum alloy

Xiao chao LIU, Yun qian ZHEN, Yu feng SUN, Zhi kang SHEN, Hai yan CHEN, Wei GUO, Wen ya LI

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The local inhomogeneity of the stir zone in friction stir welded face-centered cubic metal was investigated, which has multiple activated slip systems during plastic deformation, by selecting commercial AA1050 aluminum alloy as an ideal experimental material. The local inhomogeneity was evaluated by uniaxial tensile tests using small samples with a 1 mm gauge length. The corresponding microstructural parameters such as grain size, misorientation angle distribution, and micro-texture, were quantified by the backscattered electron diffraction technique. A comprehensive model was used to reveal the microstructure−mechanical property relationship. The experimental results showed that the uniaxial tensile property changes significantly across the weld. The maximum ultimate tensile strength (UTS) occurred in the center of the stir zone, which was 99.0 MPa. The weakest regions were located at the two sides of the stir zone. The largest difference value in UTS reached 14.9 MPa, accounting for 15% of the maximum UTS. The analysis on the structure−mechanical property relationship suggests that the micro-texture change with the location formed during the rotational material flow is the main reason for the local inhomogeneity.

Original languageEnglish
Pages (from-to)2369-2380
Number of pages12
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume30
Issue number9
DOIs
StatePublished - Sep 2020

Keywords

  • face-centered cubic metal
  • friction stir welding
  • local inhomogeneity
  • mechanical properties
  • micro-texture

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