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Heat treatment of Metastable Nd<sub>2</sub>Fe<sub>17</sub>B<sub>x</sub> Phase Formed from Undercooled Melt of Nd-Fe-B Alloys

Ozawa, S. und Kuribayashi, K. und Hirosawa, S. und Reutzel, S. und Herlach, D. M. (2006) Heat treatment of Metastable Nd<sub>2</sub>Fe<sub>17</sub>B<sub>x</sub> Phase Formed from Undercooled Melt of Nd-Fe-B Alloys. Journal of Applied Physics, 100 (12), . American Institute of Physics. DOI: 10.1063/1.2386943.

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Kurzfassung

Alloys of Nd<sub>10</sub>Fe<sub>85</sub>B<sub>5</sub>, Nd<sub>12</sub>Fe<sub>82</sub>B<sub>6</sub>, and Nd<sub>14</sub>Fe<sub>79</sub>B<sub>7</sub> were melted and then solidified under the containerless state using a drop tube. In the as-dropped sample, a large amount of the Nd<sub>2</sub>Fe<sub>17</sub>B<sub>x</sub> was contained as a metastable phase. Particularly in relatively large samples, the metastable phase, which was partially decomposed into the Nd<sub>2</sub>Fe<sub>14</sub>B and <font face="symbol">a</font>-Fe phases, shows a microstructure similar to that of normalized low-carbon steel. The heat treatment of the as-dropped samples induces a dual- stage phase transformation. The 1st stage of the phase transformation, which is dominant in the Nd<sub>14</sub>Fe<sub>79</sub>B<sub>7</sub> alloy, is the diffusive phase transformation from Nd<sub>2</sub>Fe<sub>17</sub>B<sub>x</sub> and Nd-rich phases into the Nd<sub>2</sub>Fe<sub>14</sub>B phase at 950 K, and the 2nd stage of the transformation, which is dominant in the Nd<sub>10</sub>Fe<sub>85</sub>B<sub>5</sub> alloy, is the decomposition of the metastable phase into the Nd<sub>2</sub>Fe<sub>14</sub>B and <font face="symbol">a</font>-Fe phases at 1100 K. Although the rate of the phase transformation in either stage is controlled by the diffusion of Nd atoms, the diffusivity at the 1st stage of the phase transformation, being large due to the existence of the Nd-rich phase adjacent to the Nd<sub>2</sub>Fe<sub>17</sub>B<sub>x</sub> phase, results in a decrease in transformation temperature.

Dokumentart:Zeitschriftenbeitrag
Titel:Heat treatment of Metastable Nd<sub>2</sub>Fe<sub>17</sub>B<sub>x</sub> Phase Formed from Undercooled Melt of Nd-Fe-B Alloys
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Ozawa, S.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Japan
Kuribayashi, K.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Japan
Hirosawa, S.Research and Development Center, NEOMAX Co., Ltd., Japan
Reutzel, S.Ruhr-Universität Bochum
Herlach, D. M.NICHT SPEZIFIZIERT
Datum:2006
Erschienen in:Journal of Applied Physics
Band:100
DOI :10.1063/1.2386943
Seitenbereich:
Verlag:American Institute of Physics
Status:veröffentlicht
Stichwörter:Unterkühlung von Materialien
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W FR - Forschung unter Weltraumbedingungen (alt)
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Materialforschung unter Mikro-g (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Materialphysik im Weltraum > Institut für Raumsimulation > Zentrum für die Erstarrung unterkühlter Schmelzen (ZEUS)
Hinterlegt von: Dr.rer.nat. Sven Reutzel
Hinterlegt am:06 Aug 2007
Letzte Änderung:12 Dez 2013 20:21

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