Rapid solidification and mechanical alloying of Al–Co–Ag ternary alloys for skeletal silver cobalt synthesis

Yamauchi, Isamu; Kawamura, H.

doi:10.1016/j.jallcom.2003.09.030

Cited by 9 publications

(12 citation statements)

References 14 publications

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“…Fig. 1 shows the X-ray diffraction patterns of Al 75 Co 5 Ag 20 precursors produced by the various processes as described in a previous paper [14]. It shows that several phases existed in the precursors except in a rapidly solidified specimen (RWA).…”

Section: Characterization Of Structure and Magnetic Measurementmentioning

confidence: 78%

“…The ternary Al-Co-Ag alloys listed in Table 1 were prepared by various methods as described in our previous paper [14] and used as precursor powders. The leaching was carried out in a basic solution of 20 mass% NaOH, at 333 K for 1.8 ks to remove Al atoms from the lattice sites.…”

Section: Chemical Leachingmentioning

confidence: 99%

“…However, there are no papers on this subject. In a previous paper [14], we attempted to prepare a single phase ternary alloy as a precursor by using various processes.…”

Section: Introductionmentioning

confidence: 99%

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Formation of fine skeletal Co–Ag by chemical leaching of Al–Co–Ag ternary alloys

Yamauchi

Kawamura

Nakano

et al. 2005

Journal of Alloys and Compounds

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Section: Characterization Of Structure and Magnetic Measurementmentioning

confidence: 78%

Section: Chemical Leachingmentioning

confidence: 99%

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Formation of fine skeletal Co–Ag by chemical leaching of Al–Co–Ag ternary alloys

Yamauchi

Kawamura

Nakano

et al. 2005

Journal of Alloys and Compounds

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“…It has also been reported that nanoporous Pt thin film on Si can be obtained by electrochemical dealloying of amorphous Pt x Si 1-x alloy in aqueous HF solutions [18]. Until now, dealloying has been observed in several ternary alloy systems including Ni-Cu-Mn [19], Cu-Al-Zn [20], AlCo-Ag [21,22], etc., all of which are ternary solid solutions precursors, yielding uniform microstructure by dealloying. However, research on the ternary alloy with multiphase consisting of different compositions has rarely been carried out.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of nanoporous Cu6Sn5/Cu composite by chemical dealloying of Al–Cu–Sn ternary alloy

et al. 2012

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In this article, a new ternary Al-Cu-Sn alloy system has been exploited to fabricate nanoporous Cu 6 Sn 5 / Cu composite slices through chemical dealloying in a 20 wt% NaOH solution at an elevated temperature. The microstructure of the sliced nanoporous Cu 6 Sn 5 /Cu composite was characterized using x-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, and transmission electron microscopy. The experimental results show that multi-phase precursor alloy comprises a-Al, Sn, and h-Al 2 Cu phases. The new phase Cu 6 Sn 5 emerges through dealloying, and the as-dealloyed samples have three-dimensional (3D) structure composed of large-sized channels (hundreds of nanometers) and small-sized channels (tens of nanometers). Both the large-and small-sized pores are 3D, open and bicontinuous. The synergetic dealloying of a-Al and h-Al 2 Cu in the three-phase Al-CuSn alloy and fast surface diffusion of Cu atoms and Sn atoms result in the formation of Cu 6 Sn 5 /Cu composite with bimodal channel size distributions. In addition, the dealloying duration plays a significant role in the formation of Cu 6 Sn 5 and the length scales of the small-sized ligament/ channels at a settled temperature.

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“…The cooperative growth of θ and ε phases contributes to the formation of (ε + θ ) pseudobinary eutectic easily. In addition, the crystallization route has been determined via microstructural characteristic analysis and DSC experiment.high undercooling, ternary eutectic, crystal nucleation, dendrite growth Rapid crystal growth at high undercooling is a liquid/solid phase transition process deviating far from the equilibrium situation, which has been investigated widely to develop metal solidification mechanism and prepare novel metal materials [1][2][3][4][5] . It has been achieved by means of various containerless techniques, such as glass fluxing technique, drop tube technique and various kinds of levitation techniques [6][7][8] .…”

mentioning

confidence: 99%

Dendritic and eutectic growth in Sb60Ag20Cu20 ternary alloy

Ruan

Wei

2007

SCI CHINA SER G

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The rapid solidification of Sb 60 Ag 20 Cu 20 ternary alloy was realized by high undercooling method, and the maximum undercooling is up to 142 K (0.18T L ). Within the wide undercooling range of 40-142 K, the solidified microstructures are composed of (Sb), θ and ε phases. High undercooling enlarges the solute solubility of (Sb) phase, which causes its crystal lattice to expand and its crystal lattice constants to increase. Primary (Sb) phase grows in two modes: at small undercoolings non-faceted dendrite growth is the main growth form; whereas at large undercoolings faceted dendrite growth takes the dominant place. The remarkable difference of crystal structures between (Sb) and θ phases leads to (θ + Sb) pseudobinary eutectic hard to form, whereas strips of θ form when the alloy melt reaches the (θ + Sb) pseudobinary eutectic line. The cooperative growth of θ and ε phases contributes to the formation of (ε + θ ) pseudobinary eutectic easily. In addition, the crystallization route has been determined via microstructural characteristic analysis and DSC experiment.high undercooling, ternary eutectic, crystal nucleation, dendrite growth Rapid crystal growth at high undercooling is a liquid/solid phase transition process deviating far from the equilibrium situation, which has been investigated widely to develop metal solidification mechanism and prepare novel metal materials [1][2][3][4][5] . It has been achieved by means of various containerless techniques, such as glass fluxing technique, drop tube technique and various kinds of levitation techniques [6][7][8] . Recently more attention has been attracted on the rapid crystal growth of undercooled ternary alloy. Sb-Ag-Cu ternary eutectic alloy system has a low eutectic transition temperature (699 K), whose solidification process involves the competitive nucleation and growth of several solid solutions and intermetallic compounds including faceted and nonfaceted phases.Faceted and non-faceted growth are two types of crystal growth. Faceted growth is realized by liquid phase atoms depositing on the steps of S/L interface which is flat on an atomic scale.

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Rapid solidification and mechanical alloying of Al–Co–Ag ternary alloys for skeletal silver cobalt synthesis

Cited by 9 publications

References 14 publications

Formation of fine skeletal Co–Ag by chemical leaching of Al–Co–Ag ternary alloys

Formation of fine skeletal Co–Ag by chemical leaching of Al–Co–Ag ternary alloys

Preparation and characterization of nanoporous Cu6Sn5/Cu composite by chemical dealloying of Al–Cu–Sn ternary alloy

Dendritic and eutectic growth in Sb60Ag20Cu20 ternary alloy

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