Transmission electron microscopic observation of precipitates in age-hardened die-cast aluminum alloys
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- Konno Toyohiko J.
- Institute for Materials Research, Tohoku University
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- Sasaki Syohei
- Department of Materials Science, Graduate School of Engineering, Tohoku University
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- Hamaoka Takumi
- Institute for Materials Research, Tohoku University
Bibliographic Information
- Other Title
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- 時効硬化したダイカスト用アルミニウム合金の析出相の透過電子顕微鏡観察
- ジコウ コウカ シタ ダイカストヨウ アルミニウム ゴウキン ノ セキシュツソウ ノ トウカ デンシ ケンビキョウ カンサツ
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Abstract
Squeeze die casting with a composition similar to JIS ADC12 aluminum alloy was aged at 453 K with or without prior solution treatment. Aging following solution treatment, which is termed T6-treatment, increased the hardness of this alloy. Using transmission electron microscopy, we investigated precipitates responsible for the age-hardening. Concentration of solute silicon, copper and magnesium during aging led to the formation of several types of precipitates in the matrix face-centered cubic (fcc) Al-phase. Precipitates exhibiting equiaxed shape and possessing copper-enriched faces at the interface with the Al-phase were observed. We suggest that these precipitates have fcc structure containing silicon, copper and magnesium atoms substituting for aluminum. Prolonged aging caused the formation of another type of precipitates with elongated shape, and they were identified to be the S″-phase. Some regions within the precipitates of the S″-phase transformed into the Q-phase with increasing silicon content in the precipitates. Precipitates of the S-phase and θ′-phase also formed by over-aging.
Journal
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- Journal of Japan Institute of Light Metals
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Journal of Japan Institute of Light Metals 66 (6), 291-297, 2016
The Japan Institute of Light Metals
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Details 詳細情報について
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- CRID
- 1390282681316840576
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- NII Article ID
- 130005253779
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- NII Book ID
- AN00069773
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- ISSN
- 18808018
- 04515994
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- NDL BIB ID
- 027435484
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed