Mechanism of heterogeneous nucleation of α-Fe nanocrystals from Fe89Zr7B3Cu1 amorphous alloy

Ohkubo, T.; Kai, Hidetomo; Ping, D. H.; Hara, Kazuhiro; Hirotsu, Yoshihiko

doi:10.1016/s1359-6462(00)00689-8

Cited by 62 publications

(26 citation statements)

References 14 publications

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“…The appropriate Cu addition effectively improves the crystallization of -Fe in Fe-Zr-Nb-B-Cu as-quenched ribbons. Our results strongly confirm the previous conclusion derived from the microstructural observation for Fe 89 Zr 7 B 3 Cu 1 annealed ribbons, 9,10) that the addition of Cu in Fe-Zr-B ternary alloys brings about the Cu clusters which serve as nucleation sites of -Fe. The grain size of -Fe in asquenched Fe 84 Zr 3:5 Nb 3:5 B 6 Cu 3 (x ¼ 3) ribbon was estimated as 13 nm from X-ray diffraction pattern with Scherrer's method.…”

Section: Resultssupporting

confidence: 92%

“…Using three-dimensional atom probe (3DAP), high resolution electron microscopy (HREM) and nanobeam electron diffraction (NBD) techniques, Ohkubo et al 10) found that the Cu clusters which were formed prior to the onset of the primary crystallization directly served as heterogeneous nucleation sites for the -Fe primary crystals. Different from the conventional route for crystallization with annealing, [1][2][3][4] we prepared nanocrystalline ribbons by meltspinning technique through adding high contents of Cu element in alloy without any annealing processes.…”

Section: Resultsmentioning

confidence: 99%

“…Our results strongly confirm the previous conclusion for annealed Fe-Zr-B-Cu nanocrystalline ribbons that Cu clusters could serve the nucleation site for -Fe primary crystals. 9,10) The re-enhancement of amorphous proportion at high Cu dopants (x ! 3:5) in as-quenched Fe-Zr-Nb-B-Cu may be due to the coarsening of Cu clusters and the decrease of effective number-density of Cu clusters.…”

Section: Discussionmentioning

confidence: 99%

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Structure and Magnetic Properties of As-Quenched Fe87−xZr3.5Nb3.5B6Cux Ribbons

Qin

Zhao

et al. 2009

Mater. Trans.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Structure and Magnetic Properties of As-Quenched Fe87−xZr3.5Nb3.5B6Cux Ribbons

Qin

Zhao

et al. 2009

Mater. Trans.

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“…In our judgment, the highest risk assumption of this design is that fine austenite can be heterogeneously nucleated on Cu particles as effectively as it has been observed to nucleate on M 2 C carbides [40]. The observed effectiveness of Cu as a nucleant in numerous alloy systems [44,45] supports this assumption.…”

Section: Selection Of Tempering Temperaturementioning

confidence: 80%

Computer-aided design of transformation toughened blast resistant naval hull steels: Part I

Saha

Olson

2007

J Computer-Aided Mater Des

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A systematic approach to computer-aided materials design has formulated a new class of ultratough, weldable secondary hardened plate steels combining new levels of strength and toughness while meeting processability requirements. A theoretical design concept integrated the mechanism of precipitated nickel-stabilized dispersed austenite for transformation toughening in an alloy strengthened by combined precipitation of M 2 C carbides and BCC copper both at an optimal ∼3 nm particle size for efficient strengthening. This concept was adapted to plate steel design by employing a mixed bainitic/martensitic matrix microstructure produced by air-cooling after solution-treatment and constraining the composition to low carbon content for weldability. With optimized levels of copper and M 2 C carbide formers based on a quantitative strength model, a required alloy nickel content of 6.5 wt% was predicted for optimal austenite stability for transformation toughening at the desired strength level of 160 ksi (1,100 MPa) yield strength. A relatively high Cu level of 3.65 wt% was employed to allow a carbon limit of 0.05 wt% for good weldability, without causing excessive solidification microsegregation.

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“…For example, in (Fe, Co)-B-Si-Nb BMGs with Cu additions, Stoica et al [35,36] reported the formation of a-Fe phase, while in the base alloy typically the complex Fe 23 B 6 phase precipitates upon heating. [35] Ohkubo et al [37] observed special orientation relationship between fcc-Cu and a-Fe primary phase in Fe-Zr-BCu amorphous alloy. They insist that the special orientation relationship reduces the activation energy for the nucleation of a-Fe phase.…”

Section: Resultsmentioning

confidence: 99%

Crystallization Kinetics of Fe76.5−x C6.0Si3.3B5.5P8.7Cu x (x = 0, 0.5, and 1 at. pct) Bulk Amorphous Alloy

Jung

Stoica

Sangbong

et al. 2014

Metall Mater Trans A

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The influence of Cu on crystallization kinetics of Fe 76.5Àx C 6.0 Si 3.3 B 5.5 P 8.7 Cu x (x = 0, 0.5, and 1 at. pct) bulk amorphous alloys was investigated by isothermal and isochronal differential scanning calorimetry combined with X-ray diffraction. The thermal analysis revealed that the crystallization of the amorphous matrix proceeds through at least two exothermic events. The Cufree glassy alloy forms by primary crystallization the metastable Fe 23 C 6 phase, while upon 0.5 at. pct Cu addition the primary crystallized phase is a-Fe. The activation energy for crystallization, calculated using both Kissinger and Ozawa methods, decreases from about 500 kJ/mol to about 330 kJ/mol. Further increase of Cu addition to 1 at. pct promotes the concomitant crystallization of several phases, as a-Fe, FeB, Fe 3 C, and Fe 2 P. In order to understand the crystallization behavior of the alloys as a function of Cu content, the Avrami exponent n, evaluated from the Johnson-Mehl-Avrami equation, was in details analyzed. The current study reveals that the minor Cu addition plays a crucial role at the initial stage of the crystallization. Among the studied alloys, the glassy samples with 0.5 at. pct Cu addition have the optimum compositional condition for the single a-Fe formation with a high nucleation rate.

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Mechanism of heterogeneous nucleation of α-Fe nanocrystals from Fe89Zr7B3Cu1 amorphous alloy

Cited by 62 publications

References 14 publications

Structure and Magnetic Properties of As-Quenched Fe<SUB>87−<I>x</I></SUB>Zr<SUB>3.5</SUB>Nb<SUB>3.5</SUB>B<SUB>6</SUB>Cu<I><SUB>x</SUB></I> Ribbons

Structure and Magnetic Properties of As-Quenched Fe<SUB>87−<I>x</I></SUB>Zr<SUB>3.5</SUB>Nb<SUB>3.5</SUB>B<SUB>6</SUB>Cu<I><SUB>x</SUB></I> Ribbons

Computer-aided design of transformation toughened blast resistant naval hull steels: Part I

Crystallization Kinetics of Fe76.5−x C6.0Si3.3B5.5P8.7Cu x (x = 0, 0.5, and 1 at. pct) Bulk Amorphous Alloy

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Mechanism of heterogeneous nucleation of α-Fe nanocrystals from Fe89Zr7B3Cu1 amorphous alloy

Cited by 62 publications

References 14 publications

Structure and Magnetic Properties of As-Quenched Fe<SUB>87&minus;<I>x</I></SUB>Zr<SUB>3.5</SUB>Nb<SUB>3.5</SUB>B<SUB>6</SUB>Cu<I><SUB>x</SUB></I> Ribbons

Structure and Magnetic Properties of As-Quenched Fe<SUB>87&minus;<I>x</I></SUB>Zr<SUB>3.5</SUB>Nb<SUB>3.5</SUB>B<SUB>6</SUB>Cu<I><SUB>x</SUB></I> Ribbons

Computer-aided design of transformation toughened blast resistant naval hull steels: Part I

Crystallization Kinetics of Fe76.5−x C6.0Si3.3B5.5P8.7Cu x (x = 0, 0.5, and 1 at. pct) Bulk Amorphous Alloy

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Structure and Magnetic Properties of As-Quenched Fe<SUB>87−<I>x</I></SUB>Zr<SUB>3.5</SUB>Nb<SUB>3.5</SUB>B<SUB>6</SUB>Cu<I><SUB>x</SUB></I> Ribbons

Structure and Magnetic Properties of As-Quenched Fe<SUB>87−<I>x</I></SUB>Zr<SUB>3.5</SUB>Nb<SUB>3.5</SUB>B<SUB>6</SUB>Cu<I><SUB>x</SUB></I> Ribbons