In situ formation of two glassy phases in the Nd–Zr–Al–Co alloy system

Park, Eun Soo; Jeong, Eun-Mi; Lee, J.-K.; Bae, Jung Chan; Kwon, Ah-Ram; Gebert, A.; Schultz, L.; Chang, Hye Jung; Kim, D.H.

doi:10.1016/j.scriptamat.2006.10.020

Cited by 82 publications

(45 citation statements)

References 17 publications

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“…In 2004, Kündig et al reported two-phase glassy alloys in the Zr-La-Al-Ni-Cu system [6]. In the following years, phase separated metallic glasses were successfully prepared in several alloy systems: Zr-Y-Co-Al [7], Ni-Nb-Y [8], ZrNd-Al-Co [9], Cu-(Zr,Hf)-(Gd,Y)-Al [10], and Zr-(Ce,Pr,Nd)-Al-Ni [11]. In all these cases, phase separation leads to a special microstructure with a length-scale up to several micron and some self similar features are observed by transmission electron microscopy (TEM) [6,12,13].…”

Section: Introductionmentioning

confidence: 99%

Spinodal decomposition of Ni–Nb–Y metallic glasses

et al. 2009

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Section: Introductionmentioning

confidence: 99%

Spinodal decomposition of Ni–Nb–Y metallic glasses

et al. 2009

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“…Amorphous/crystalline metallic alloys are based on liquid immiscible alloys [1,[3][4][5][6]. An interesting group of two-phase metallic glasses is prepared on the basis of liquid immiscible alloys in such systems as LaZr-Al-Cu-Ni [7], Nd-Zr-Al-Co [8], and Ni-Nb-Y [7]. * corresponding author; e-mail: kziewiec@up.krakow.pl…”

Section: Introductionmentioning

confidence: 99%

The Microstructure and Thermal Stability of the Two-Component Melt-Spun Ni₅₅Fe₂₀Cu₅P₁₀B₁₀ TCMS Amorphous/Amorphous Composite

et al. 2016

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The aim of this study is to present the special features and properties of the two alloys of similar average chemical composition Ni55Fe20Cu5P10B10, processed through two different routes. The first alloy was melt-spun after the ejection of homogeneous liquid using a traditional single chamber crucible, and the second alloy was ejected from a double chamber crucible as two separate liquids: i.e., Ni40Fe40B20 and Ni70Cu10P20, mixing only at the orifice area. The studies of the microstructure of the composite alloy were performed through the use of transmission electron microscopy and scanning electron microscopy. The Ni55Fe20Cu5P10B10 two-chamber meltspun (TCMS) alloy, as well as the homogeneous Ni55Fe20Cu5P10B10, Ni40Fe40B20, and Ni70Cu10P20 alloys, were heated to elevated temperatures and their characteristics studied by means of differential scanning calorimetry. The temperature resistivity change method was applied to the examination of the Ni55Fe20Cu5P10B10 TCMS alloy. The phase composition after heat treatment was investigated using X-ray diffraction. The results of the microstructure examination show that the TCMS alloy is an amorphous/amorphous composite, and is notable for its Ni-Fe-B and Ni-Cu-P stripes resulting from its differentiated chemical composition. Another unique feature of the TCMS alloy is that it retains its wood-like morphology even after high-temperature heat treatment. The crystallisation of the TCMS alloy starts from the Ni-Cu-P constituent and ends with the Ni-Fe-B areas of the sample. The results are discussed on the basis of previous work completed on amorphous matrix composites.

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“…In order to design such metallic glasses, two perquisites should be considered: (1) Two different liquid phases should exist in the melt by proper addition of alloying element which has positive enthalpy of mixing with at least one of the constituent elements; and (2) Glass forming ability of the two liquid phases should be enough to ensure the formation of two different amorphous phases in the solid state. So far, the phase separation phenomena have been reported in several glass forming systems (Park et al, 2004;Mattern et al, 2005;Park et al, 2007, Chang et al, 2010. It has been also shown that droplet or interconnected type microstructure can be formed with two different microstructure formation mechanisms, i.e., spinodal decomposition or nucleation and growth which are determined by the alloy composition (Chang et al, 2010;Park et al, 2004;Park et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Nano-scale Shell in Phase Separating Gd-Ti-Al-Co Metallic Glass

Chang¹,

Park²,

Kim³

2013

Applied Microscopy

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In the present study, formation of yard and shell has been investigated in as-melt-spun Gd 30 Ti 25 Al 25 Co 20 alloy using a variety of transmission electron microscopy techniques. The phase separation during cooling leads to the formation of the microstructure consisting of amorphous droplets with different size scales embedded in the amorphous matrix. Due to the interdiffusion at the interface after the first-step phase separation, ~50 nm-thick yard develops on the surface of the primary droplet particle. Due to the critical wetting phenomenon, ~5 nm thickness shell enveloping the droplet forms. The sell is enriched in Co and Ti, implying that the composition is close to that of the droplet.

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In situ formation of two glassy phases in the Nd–Zr–Al–Co alloy system

Cited by 82 publications

References 17 publications

Spinodal decomposition of Ni–Nb–Y metallic glasses

Spinodal decomposition of Ni–Nb–Y metallic glasses

The Microstructure and Thermal Stability of the Two-Component Melt-Spun Ni₅₅Fe₂₀Cu₅P₁₀B₁₀ TCMS Amorphous/Amorphous Composite

Nano-scale Shell in Phase Separating Gd-Ti-Al-Co Metallic Glass

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In situ formation of two glassy phases in the Nd–Zr–Al–Co alloy system

Cited by 82 publications

References 17 publications

Spinodal decomposition of Ni–Nb–Y metallic glasses

Spinodal decomposition of Ni–Nb–Y metallic glasses

The Microstructure and Thermal Stability of the Two-Component Melt-Spun Ni55Fe20Cu5P10B10 TCMS Amorphous/Amorphous Composite

Nano-scale Shell in Phase Separating Gd-Ti-Al-Co Metallic Glass

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The Microstructure and Thermal Stability of the Two-Component Melt-Spun Ni₅₅Fe₂₀Cu₅P₁₀B₁₀ TCMS Amorphous/Amorphous Composite