Effect of microstructures on tensile properties of a 6061 extruded alloy containing weld parts.

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  • 圧着部を有する６０６１アルミニウム合金押出形材の引張特性に及ぼすミクロ組織の影響
  • アッチャクブ オ ユウスル 6061 アルミニウム ゴウキン オシダシ カタザイ ノ ヒッパリ トクセイ ニ オヨボス ミクロ ソシキ ノ エイキョウ

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Abstract

The 6061 extruded sections such as the hollow shape have a few weld parts, and the microstructure is recrystallized around the weld part. The quality and microstructural control of the weld part is very important for the machine parts as the mechanical properties depend on the difference of deformation behavior between weld part and non-weld one. The purpose of our study is to investigate the deformation mechanism of 6061 extruded alloys having the weld part. In this paper, the tensile property of 6061 extruded alloys having the weld part was evaluated as compared with the non-weld one. As a result, the elongation of 6061 extruded alloys having the weld part was lower than that of the non-weld one. The result analyzed with the Electron Backscatter Diffraction Patterns (EBSPs) showed that the weld part was the recrystallized structure, and the non-weld part was the un-recrystallized one having subgrains. Then the texture structures were different between the weld part and the non-weld one. The tensile deformation of 6061 extruded alloys having the weld part depended on the difference of texture structure (at same the time the Taylor's factor, M, depends on texture structure) such as the formation of discontinuous structures. Therefore the elongation values obtained from tensile test does not show the real ductility behavior, and the considerations of deformation mechanism that depend on microstructures in parallel parts determine the real ductility of aluminum alloys having the weld part.

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