Corrigendum to “Chemistry of nanoscale precipitates in Mg–2.1Gd–0.6Y–0.2Zr (at.%) alloy investigated by the atom probe technique” [Mater. Sci. Eng. A 395 (2005) 301–306]

Honma, T.; Ohkubo, T.; Hono, K.; Kamado, Shigeharu

doi:10.1016/j.msea.2005.05.002

Cited by 56 publications

(87 citation statements)

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“…, where GP-zone, 00 , 0 are the metastable phases and is only the stable one. [1][2][3][4][5] Above all, it had never been much doubted that most of the Mg-RE alloys in common allow the 00 -phase characterized by a D0 19 -type structure to occur at the very early stage of aging. Recently, Nishijima et al made thorough and detailed examinations on the precipitation behaviours of Mg-Gd alloys 6,7) and Mg-Y alloys 8) under a test temperature of 200 C, by making full use of high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM) technique, and they finally drew rather sensational conclusions, contradicting the previous interpretation addressed above: the first aging product is not the D0 19 -type structure phase but a certain short-range ordered state in the respective RE-enriched regions, which is structurally related to the subsequent product of the 0 -precipitate.…”

Section: Introductionmentioning

confidence: 99%

Structural Changes of Precipitates by Aging of an Mg-4 at%Dy Solid Solution Studied by Atomic-Scaled Transmission Electron Microscopy

et al. 2011

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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 0 phase associated with an Mg 7 Dy-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 0 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 0 precipitates, which have an orthorhombic structure with lattice parameters of a ¼ 0:659 nm, b ¼ 2:231 nm, c ¼ 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 0 precipitates are gradually reduced in volumes and replaced by precipitates of cubic structure.

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Section: Introductionmentioning

confidence: 99%

Structural Changes of Precipitates by Aging of an Mg-4 at%Dy Solid Solution Studied by Atomic-Scaled Transmission Electron Microscopy

et al. 2011

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“…[11][12][13] Atomic-scaled HAADF-STEM observations of 0 phase precipitates in an Mg 95 Gd 5 alloy can directly derive a new structure model of Mg 7 Gd, 12) which is apparently different from a structure model reported in a previous paper. 14) Also, detailed morphology of the 0 phase precipitates in top-aged Mg 95 Gd 5 12) and Mg 98 Y 2 13) alloys has been elucidated by HAADF-STEM observations.…”

Section: Introductionmentioning

confidence: 99%

Structural Changes of Precipitates in an Mg-5 at%Gd Alloy Studied by Transmission Electron Microscopy

2007

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Structural changes of precipitates in an Mg-5 at%Gd (Mg 95 Gd 5 ) alloy by aging at 200 C and 250 C have been studied by ordinary highresolution transmission electron microscopy (HRTEM) and high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). In the early stage of precipitation by aging at 200 C up to 5 h, a short-range ordered structure exists in Gd-enriched regions with an about 2 nm size, and nuclei of an Mg 7 Gd structure ( 0 phase) occur in the short-range ordered structure by aging at 200 C for 5 h. The C for 100 h.

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“…The peak hardness of aged alloys is considered to be responsible for the precipitation of 0 phases in the Mgmatrix. [1][2][3][4][5][6][7][8] However, the details of morphology of the precipitation 0 phase have not been understood very well, because ordinary transmission electron microscopy (TEM) is not a powerful technique to elucidate the morphology of fine coherent precipitates.…”

Section: Introductionmentioning

confidence: 99%

Characterization of β′ Phase Precipitates in an Mg-5 at%Gd Alloy Aged in a Peak Hardness Condition, Studied by High-Angle Annular Detector Dark-Field Scanning Transmission Electron Microscopy

et al. 2006

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The 0 phase precipitated in a 95 at%Mg-5 at%Gd (Mg 95 Gd 5 ) alloy aged in a peak hardness condition (at 200 C for 100 hrs) is studied by high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). Atomic-scaled HAADF-STEM observations of the 0 phase can propose a new structure model with an orthorhombic unit cell of a ¼ 0:64 nm, b ¼ 2:28 nm and c ¼ 0:52 nm and a composition of Mg 7 Gd. The 0 precipitates have a plate-shape with an about 40 nm width along the [001] m of the Mg-matrix and an about 100 nm length along [210] m -typed directions, and joining of the plate-shaped precipitates establishes a two-dimensional cell structure parallel to the (001) m plane of the Mg-matrix.

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Corrigendum to “Chemistry of nanoscale precipitates in Mg–2.1Gd–0.6Y–0.2Zr (at.%) alloy investigated by the atom probe technique” [Mater. Sci. Eng. A 395 (2005) 301–306]

Cited by 56 publications

References 0 publications

Structural Changes of Precipitates by Aging of an Mg-4 at%Dy Solid Solution Studied by Atomic-Scaled Transmission Electron Microscopy

Structural Changes of Precipitates by Aging of an Mg-4 at%Dy Solid Solution Studied by Atomic-Scaled Transmission Electron Microscopy

Structural Changes of Precipitates in an Mg-5 at%Gd Alloy Studied by Transmission Electron Microscopy

Characterization of β′ Phase Precipitates in an Mg-5 at%Gd Alloy Aged in a Peak Hardness Condition, Studied by High-Angle Annular Detector Dark-Field Scanning Transmission Electron Microscopy

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Corrigendum to “Chemistry of nanoscale precipitates in Mg–2.1Gd–0.6Y–0.2Zr (at.%) alloy investigated by the atom probe technique” [Mater. Sci. Eng. A 395 (2005) 301–306]

Cited by 56 publications

References 0 publications

Structural Changes of Precipitates by Aging of an Mg-4 at%Dy Solid Solution Studied by Atomic-Scaled Transmission Electron Microscopy

Structural Changes of Precipitates by Aging of an Mg-4 at%Dy Solid Solution Studied by Atomic-Scaled Transmission Electron Microscopy

Structural Changes of Precipitates in an Mg-5 at%Gd Alloy Studied by Transmission Electron Microscopy

Characterization of &beta;&prime; Phase Precipitates in an Mg-5 at%Gd Alloy Aged in a Peak Hardness Condition, Studied by High-Angle Annular Detector Dark-Field Scanning Transmission Electron Microscopy

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Characterization of β′ Phase Precipitates in an Mg-5 at%Gd Alloy Aged in a Peak Hardness Condition, Studied by High-Angle Annular Detector Dark-Field Scanning Transmission Electron Microscopy