Influence of Oxygen Contents on Nanocrystallization of Co&lt;sub&gt;33&lt;/sub&gt;Zr&lt;sub&gt;67&lt;/sub&gt; and Zr&lt;sub&gt;65&lt;/sub&gt;Cu&lt;sub&gt;17.5&lt;/sub&gt;Ni&lt;sub&gt;10&lt;/sub&gt;Al&lt;sub&gt;7.5&lt;/sub&gt; Alloys

Köster, Uwe; Meinhardt, Jürgen; Roos, Stefanie Ricarda; Rüdiger, Andreas

doi:10.4028/www.scientific.net/msf.225-227.311

Cited by 76 publications

(26 citation statements)

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“…As a primary phase, the nanocrystallization of the bigcube NiZr 2 -like phase has been found in the Zr-based multicomponent system. 58,59 In the present alloy, the primary NiZr 2 nanophase during the first-stage crystallization plays a role similar to that of the precipitation of the Y-rich nanocrystalline in the Zr 33 Y 27 Al 15 Ni 25 metallic glass. As a result, it can be assumed that the remaining glassy phase will be enriched in Ti or Hf elements (although the exact chemical composition is yet unknown) and behave as a glass showing the T g2 and ⌬T x2 .…”

Section: Discussionmentioning

confidence: 90%

Glass formation in a (Ti, Zr, Hf)–(Cu, Ni, Ag)–Al high-order alloy system by mechanical alloying

Zhang

Shen

2003

J. Mater. Res.

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In this work, glass formation under high-energy ball milling was investigated for a (Ti 0.33 40 Al 10 high-order alloy system with equiatomic substitution for early and late transition-metal contents. For comparison, an amorphous alloy ribbon with the same composition was prepared using the melt-spinning method as well. Structural features of the samples were characterized using x-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. Mechanical alloying resulted in a glassy alloy similar to that obtained by melt spinning. However, the glass formation was incomplete, and a small amount of unreacted crystallites smaller than 30 nm in size still remained in the final ball-milled product. Like the melt-spun glass, the ball-milled glassy alloy also exhibited a distinct glass transition and a wide supercooled liquid region of about 80 K. Crystallization of this high-order glassy alloy proceeded through two main stages. After the primary nanocrystallization was completed, the remaining amorphous phase also behaved as a glass, showing a detectable glass transition and a large supercooled liquid region of about 100 K.

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Section: Discussionmentioning

confidence: 90%

Glass formation in a (Ti, Zr, Hf)–(Cu, Ni, Ag)–Al high-order alloy system by mechanical alloying

Zhang

Shen

2003

J. Mater. Res.

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“…7,8,9 Quasi-crystals, which can be approximated by complex crystal structures with large lattices, are also frequently seen as the primary precipitation phase in a number of glassy alloy systems. 7,10,11 Achieving a fundamental understanding of these unconventional phase selections will provide access to a class of metastable structures which are not reachable by other material processing methods.…”

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confidence: 99%

Structural hierarchy as a key to complex phase selection in Al-Sm

Zhang

Sun

et al. 2017

Phys. Rev. Materials

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“…Previous studies revealed that the icosahedral-like local structure is the dominant local structure in Zr-based glass alloys with high glass-forming ability. 5,[11][12][13][14][15][16][17][18][19][20][21][22]25) The precipitation of icosahedral quasicrystal as the initial crystalline phase in this study strongly supports the existence of icosahedral short-or medium-range order in Zr-Ni-Nb-CuAl glassy alloys. For further confirming the icosahedral quasicrystalline phase, we investigated the microstructure of the samples by TEM.…”

Section: Resultsmentioning

confidence: 57%

“…Recent researches reveal that the icosahedral phase has been observed in a number of Zr-based metallic glasses with high glass-forming ability (GFA) during early stage of crystallization. [11][12][13][14][15][16][17][18][19][20][21][22] Köster et al reported the formation of I-phase upon crystallization in Zr-Cu-Al 11) and Zr-Cu-Ni-Al [11][12][13][14] metallic glasses. Icosahedral phase formation in some of these alloys is attributed to the presence of oxygen impurity.…”

Section: Introductionmentioning

confidence: 99%

Precipitation of Icosahedral Phase in Zr-Ni-Nb-Cu-Al Metallic Glasses

Zhao

Pang

et al. 2009

Mater. Trans.

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The crystallization behaviors of Zr-Ni-Nb-Cu-Al metallic glasses are greatly influenced by the substitution of Ni for Zr. For the glassy Zr 71Àx Ni x Nb 3 Cu 16 Al 10 (x ¼ 7, 9, 11 at%) alloys, the onset temperature of crystallization T x increases from 717 to 748 K with increasing Ni content from 7 at% to 11 at%. The primary crystallization reaction of the studied glassy alloys corresponds to the formation of icosahedral phase from amorphous matrix. The precipitation of quasicrystalline phase with a large volume fraction in the Zr 64 Ni 7 Nb 3 Cu 16 Al 10 alloy indicates that the decrease of Ni content promotes the formation of icosahedral phase. Johnson-Mehl-Avrami analysis of isothermal transformation data suggests that the icosahedral phase precipitation proceeds by a diffusion-controlled growth mode with nearly constant nucleation rate. Furthermore, the Zr 71Àx Ni x Nb 3 Cu 16 Al 10 (x ¼ 7, 9, 11 at%) alloys possess high glass-forming ability, and the critical diameter for glass formation reaching 6 mm, 9 mm and 9 mm by copper-mould casting method, respectively.

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Influence of Oxygen Contents on Nanocrystallization of Co<sub>33</sub>Zr<sub>67</sub> and Zr<sub>65</sub>Cu<sub>17.5</sub>Ni<sub>10</sub>Al<sub>7.5</sub> Alloys

Cited by 76 publications

References 0 publications

Glass formation in a (Ti, Zr, Hf)–(Cu, Ni, Ag)–Al high-order alloy system by mechanical alloying

Glass formation in a (Ti, Zr, Hf)–(Cu, Ni, Ag)–Al high-order alloy system by mechanical alloying

Structural hierarchy as a key to complex phase selection in Al-Sm

Precipitation of Icosahedral Phase in Zr-Ni-Nb-Cu-Al Metallic Glasses

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