書誌事項
- タイトル別名
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- Structural changes of precipitates by aging of an Mg–4at%Dy solid solution studied by atomic-scaled transmission electron microscopy
- ゲンシ シキベツ トウカ デンシ ケンビキョウホウ デ ヒョウカ シタ Mg 4at Dy ゴウキン ノ ジコウ セキシュツブツ ノ コウゾウ ヘンカ
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Phase transformation of solid solution decomposition occurring in a 96 at%Mg–4 at%Dy alloy, which was solution-treated at 540°C and subsequently aged at 250°C for various lengths of time, has been investigated by conventional transmission electron microscopy (TEM)in combination with high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). The atomic-scaled observations based on both techniques provide the evidence that the first appreciable change in microstructure caused by aging is the occurrence of a short-range ordered state in Dy-segregated regions and that the short-range ordered state allows full of the nuclei of β′ phase associated with an Mg7Dy-type structure to occur in the domains, just as in cases of Mg–Gd and Mg–Y systems. With an increase of age-hardening effect, the β′ precipitates become larger and increasingly anisotropic in morphology, accompanying three orientation variants in coherent with the Mg-matrix. When reaching at the stage of hardness maximum (as-aged at 250°C for 100 h), the β′ precipitates, which have an orthorhombic structure with lattice parameters of a=0.659 nm, b=2.231 nm, c=0.523 nm, take the form of a thin disk-shape with a thickness of 20~100 nm and a diameter of 200~400 nm. With an advance of over-aging effect, the β′ precipitates are gradually reduced in volumes and replaced by β precipitates of cubic structure.
収録刊行物
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- 軽金属
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軽金属 61 (5), 199-205, 2011
一般社団法人 軽金属学会
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詳細情報 詳細情報について
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- CRID
- 1390001206340258304
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- NII論文ID
- 130004774986
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- NII書誌ID
- AN00069773
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- ISSN
- 18808018
- 04515994
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- NDL書誌ID
- 11077338
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- JaLC
- NDL
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