| 摘要 |
PROBLEM TO BE SOLVED: To provide a 6,000-series aluminum alloy extruded hollow shape material in which bending workability is improved, and the bending workability and crush resistance are made compatible. SOLUTION: The Al-Mg-Si-based aluminum alloy extruded hollow shape material has a fibrous structure where the aspect ratio L<SB>1</SB>/L<SB>2</SB>between the length L<SB>1</SB>in the extruding direction of crystal grains and the length L<SB>2</SB>in the thickness direction exceeds 2, and also has a structure with anisotropy where the elongationδ<SB>1</SB>in the 45 degree direction to the extruding direction is higher than the elongationδ<SB>2</SB>in the parallel direction to the extruding direction and the elongationδ<SB>3</SB>in the perpendicular direction to the extruding direction, and the ratio betweenδ<SB>1</SB>andδ<SB>2</SB>, i.e.,δ<SB>1</SB>/δ<SB>2</SB>and the ratio betweenδ<SB>1</SB>andδ<SB>3</SB>, i.e.,δ<SB>1</SB>/δ<SB>3</SB>are≥1.1, respectively. COPYRIGHT: (C)2005,JPO&NCIPI
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