Distribution of tensile property and microstructure in friction stir weld of 6063 aluminum

Yutaka S. Sato, Hiroyuki Kokawa

研究成果: Article査読

276 被引用数 (Scopus)

抄録

Dominant microstructural factors governing the global tensile properties of a friction-stir-welded joint of 6063 aluminum were examined by estimating distribution of local tensile properties corresponding to local microstructure and hardness. Yield and ultimate tensile strengths of the as-welded weld were significantly lower than those of the base material. Postweld aging and postweld solution heat-treatment and aging (SHTA) restored the strengths of the weld to the levels of the base material. Elongation was found to increase with increasing strength. Hardness tests showed that the as-welded weld was soft around the weld center and that the aged weld and the SHTA weld had relatively homogeneous distributions of high hardness. Hardness profiles of the welds were explained by precipitate distributions and precipitation sequences during the postweld heat treatments. The strengths of the welds were related to each minimum hardness value. In a weld having a heterogeneous hardness profile, the fracture occurred in the region with minimum hardness. When a weld had a homogeneous hardness profile, its fracture site depended on both crystallographic-orientation distribution of the matrix grains and strain tensor of the imposed deformation, i.e., it fractured in the region with a minimum average Taylor factor.

本文言語English
ページ(範囲)3023-3031
ページ数9
ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
32
12
DOI
出版ステータスPublished - 2001 12

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金

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