To provide a high strength and high toughness Al-Mg-Si based aluminum alloy extruded material having excellent corrosion resistance which can provide strength and toughness more improved than those of the conventional Al-Mg-Si based alloy, i.e., a high strength of ≥400 MPa by proof stress and a high toughness of ≥25J/cm2 by Charpy impact value, and is suitable as a vehicle apparatus member; to provide a method for producing the extruded material; and to provide a method for producing a forged material.
The extruded material has a composition comprising 0.7 to 1.4% Si, 0.55 to 0.95% Mg and >0.43 to 1.0% Cu, and one or more kinds selected from 0.15 to 0.43% Mn, 0.05 to 0.23% Cr and 0.05 to 0.24% Zr, and the balance Al with impurities, and also satisfying [Si%]×1.73-[Mg%]>[Cu%]×1.03, and the extruded material is characterized in that the central part in the thickness of the cross-section has a subgrain structure with an average crystal grain size of ≤10 μm, and the ratio of the subgrain structure occupied in the cross-section is ≥70%.
MATSUDA SHINICHI
KANDA TOMOYUKI
| JPH11310841A | 1999-11-09 | |||
| JPH09202933A | 1997-08-05 | |||
| JPH08232035A | 1996-09-10 | |||
| JP2004131826A | 2004-04-30 | |||
| JPH05339667A | 1993-12-21 | |||
| JPH07150312A | 1995-06-13 | |||
| JPH06330264A | 1994-11-29 | |||
| JP2007169699A | 2007-07-05 |
Kenji Akatsuka
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