The Structures of Precipitates in an Mg-0.5 at%Nd Age-Hardened Alloy Studied by HAADF-STEM Technique
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- Saito Kaichi
- Department of Materials Science and Engineering, Akita University
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- Hiraga Kenji
- Institute for Materials Research, Tohoku University
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The crystal structures and microstructures of precipitates formed in an Mg-0.5 at%Nd alloy aged at certain temperatures ranging between 170°C and 250°C are studied in detail by high-angle annular detector dark-field scanning transmission electron microscopy. The precipitation sequence can be presented as Mg-solution → GP-zone → β′ (orthorhombic) → β1 (fcc). At the early stage of aging (170°C for 2 h), fine precipitates of planar GP-zones appear in parallel to (100)m planes, with a thickness of sub-nm and a length of 5–15 nm (the subscript letter of m denotes matrix). With an advance of aging, the GP-zones increasingly grow larger and combine with the neighbours, thus making themselves further prolonged along the directions addressed above. When reaching at the top-stage of aging (170°C for 100 h), the alloy additionally allows the β′-phase to coexist, taking the form of lens-shape with a thickness of 2–5 nm and a diameter of 5–15 nm. The β′-phase has an orthorhombic structure (Mg7Nd) with a=0.64 nm, b=1.1 nm, and c=0.52 nm, which is coherently connected to the matrix. At the stage of over-aging, both the GP-zones and the β′-phase disappear and instead coarse precipitates of the stable β1-phase (Mg3Nd; fcc) are formed with particular crystallographic relations of [001]m||[110]p and [110]m||[112]p (the subscript letter of p denotes precipitate).
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 52 (10), 1860-1867, 2011
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390282679227298944
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- NII論文ID
- 10029692694
- 130004454565
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- NII書誌ID
- AA1151294X
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- COI
- 1:CAS:528:DC%2BC3MXhsFakt7nN
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 11257383
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可