Analysis of Small Fatigue Crack in Al-Mg-Si Aluminum Alloy

Takahiro Shikama; Shinji Yoshihara; Yoshimasa Takahashi; Hiroshi Noguchi

doi:10.4028/www.scientific.net/MSF.794-796.313

Paper Titles

Effect of Electroless Ni-P Plating on the Fatigue Strength of Dilute Al-Si Alloys
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Influence of Particles on Short Fatigue Crack Initiation in 2050-T8 and 7050-T74
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Grain-Size Dependency of Low-Temperature Creep in Ultrafine-Grained Aluminum
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Extrapolation of Creep Curve and Creep Rate by Strain Acceleration Parameter in Al-Mg Solid Solution Alloys
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Analysis of Small Fatigue Crack in Al-Mg-Si Aluminum Alloy
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Modeling of the Influence of Pore Morphology on Damage Behavior of an Aluminum Die Casting Alloy
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Effect of Micro-Voids on Crack Initiation and Propagation in Bending Deformation of Al-Mg-Si Alloy Sheet
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Effect of Rolling on Mechanical Properties and Fatigue Behavior of an Al-Mg-Sc-Zr Alloy
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Application of the Hybrid Metal Extrusion & Bonding (HYB) Method for Joining of AA6082-T6 Base Material
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HomeMaterials Science ForumMaterials Science Forum Vols. 794-796Analysis of Small Fatigue Crack in Al-Mg-Si...

Analysis of Small Fatigue Crack in Al-Mg-Si Aluminum Alloy

Abstract:

In general, aluminum alloy does not exhibit distinct fatigue limit (knee point) in the S-N diagram. The growth of a small fatigue crack of precipitation-hardened Al-Mg-Si system alloy (6061-T6) was investigated to clarify the mechanism of non-appearance of distinct fatigue limit (knee point) in the S-N diagram. The small crack was analysed in detail by replica method, scanning electron microscope (SEM), and Electron Back Scatter Diffraction Patterns (EBSD). On the other hand, the existence of distinct fatigue limit (knee point) of new developed aluminum alloy by adding excess Mg to the 6061 alloy was found. In this study, the resistance of small crack growth of the developed alloy was compared with standard 6061 alloy. It was revealed that the resistance of crack growth of new developed alloy was higher than that of standard 6061 alloy in short crack region (l<1.0 mm).

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Periodical:

Materials Science Forum (Volumes 794-796)

Pages:

313-318

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.794-796.313

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Online since:

June 2014

Authors:

Takahiro Shikama*, Shinji Yoshihara, Yoshimasa Takahashi, Hiroshi Noguchi

Keywords:

Aluminium Alloy, Extrusion, Fatigue Limit, Short Crack

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