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Mg-Si クラスタ形成による Al-Mg-Si 合金の強度と延性の向上およびその機構

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Title: Mg-Si クラスタ形成による Al-Mg-Si 合金の強度と延性の向上およびその機構
Other Titles: Improvement of Strength and Elongation Balance of Al-Mg-Si Alloy Utilizing Mg-Si Cluster and Its Mechanism
Authors: 高田, 健1 Browse this author
潮田, 浩作2 Browse this author
秋吉, 竜太郎3 Browse this author
池田, 賢一4 Browse this author →KAKEN DB
高橋, 淳5 Browse this author
波多, 聰6 Browse this author
金子, 賢治7 Browse this author
Authors(alt): Takata, Ken1
Ushioda, Kohsaku2
Akiyoshi, Ryutaro3
Ikeda, Ken-ichi4
Takahashi, Jun5
Hata, Satoshi6
Kaneko, Kenji7
Keywords: aluminum-magnesium-silicon alloy
magnesium-silicon cluster
repartition of solute
cell structure
Issue Date: Aug-2015
Publisher: 日本金属学会
Journal Title: 日本金属学会誌
Journal Title(alt): Journal of the Japan Institute of Metals
Volume: 79
Issue: 8
Start Page: 391
End Page: 397
Publisher DOI: 10.2320/jinstmet.J2015026
Abstract: Tensile properties of Al-Mg-Si alloy with Mg-Si clusters was compared with that with β″ precipitate with the same strength. It was found that the elongation of the alloy with Mg-Si cluster was greater than the alloy with β″ precipitate because of high work hardening rate, in particular at large strain region. Decomposition of Mg-Si cluster into solute Mg and Si atoms during the tensile deformation test were also shown by differential scanning calorimetry (DSC). Three types of dislocation characteristics were observed from these alloys by transmission electron microscopy (TEM), homogeneous distribution of dislocation with β″ precipitate, cell structure with Mg and Si in solid solution, and combination of them with Mg-Si cluster. For the case of alloy with Mg-Si cluster, the yield strength was significantly increased due to the cutting mechanism. Simultaneously, the elongation was greatly improved due to the presences of decomposed solute Mg and Si atoms with plastic strain, which are inferred to prevent dynamic recovery in the later stage of tensile test. Consequently, the alloy with clusters has advantages from both alloys with precipitates and solutes, in terms of strength and elongation balance among the conventional 6000 series and 7000 series Al alloys.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 池田 賢一

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