Dealloying of Cu-Zr-Ti Bulk Metallic Glass in Hydrofluoric Acid Solution

Abe, Hiroya; Sato, Kazuyoshi; Nishikawa, Hiroshi; Takemoto, Tadashi; Fukuhara, Mikio; Inoue, Akihisa

doi:10.2320/matertrans.me200823

Cited by 36 publications

(22 citation statements)

References 16 publications

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“…Formation of BMGs in the Cu-rich Cu-Zr-Ti ternary system has been researched by Wang et al [10]; the BMGs on each composition line manifest decreased thermal stabilities and glass forming abilities with increasing Ti content. Dai et al [11] by Naoi et al [15] and its dealloying behavior has been analysed under free corrosion conditions [16] resulting in the idea, that dealloying metallic glasses may be a possible candidate for developing nanostructured metals. Moreover, Basu et al [17] have shown that Miedema's approach has been useful in determining the glass forming composition range for a particular alloy system (including the Cu-Zr-Ti system).…”

Section: Introductionmentioning

confidence: 99%

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Atomic structure of Cu–Zr–Ti metallic glasses subjected to high temperature annealing

Durisin

Balga

Saksl

et al. 2014

Journal of Alloys and Compounds

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An influence of high temperature annealing process (before crystallization) on the atomic structure of two different as-prepared ribbon Cu-Zr-Ti metallic glasses (Cu 60 Zr 20 Ti 20 and Cu 55 Zr 16 Ti 29 , at. %) was experimentally studied by means of differential scanning calorimetry and in situ hard X-ray diffraction. Results of our experiments prove different atomic structure and behaviour of the glasses upon the annealing. Special emphasis is placed on the thermally activated effects which precede the crystallization. During the annealing, both glasses initially show with elevated temperature continuous short and middle range order thermal expansion and an overall decline of the atomic structure ordering. But above a temperature, which can be slightly different for every mean atomic neighbour (or every atomic coordination shell), one can observe a change in behaviour of the glasses: the glasses modify the thermal expansion rate of most of the mean atomic neighbours' distances and show a tendency to increase the degree of ordering of the atomic structure. Both these effects are more pronounced for Cu 55

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Section: Introductionmentioning

confidence: 99%

“…In this article we present modifications of the atomic structure of Cu 60 Zr 20 Ti 20 and Cu 55 Zr 16 Ti 29 (at. %) metallic glass upon annealing at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Atomic structure of Cu–Zr–Ti metallic glasses subjected to high temperature annealing

Durisin

Balga

Saksl

et al. 2014

Journal of Alloys and Compounds

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“…This process provides the finest pore size, in the nanometre range, as shown for Au-Ag [7], Au-Cu [7], Au-Sn [8], Cu-Mn [9] alloys. De-alloying of homogeneous amorphous alloys as well as of phase separated amorphous phases, has been attempted in a number of cases with success [10][11][12]. multicomponent, removal of elements bring composition outside the glass-forming range, nucleation…”

Section: Introductionmentioning

confidence: 99%

De-alloying of rapidly solidified amorphous and crystalline alloys

Battezzati

Scaglione

2011

Journal of Alloys and Compounds

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De-alloying occurs when a less noble metal is selectively removed from an alloy either by chemical or electrochemical means. Under appropriate experimental conditions and for suitable alloy composition, the resulting material is constituted by crystalline ligaments rich in the noble element and pores. The literature reports a substantial amount of information on de-alloying crystalline homogeneous solid solutions, mostly based on noble metals, whereas the process has been attempted in a limited number of cases with amorphous alloys. The latter case is reviewed here and new results are given for a Au-based metallic glass evidencing the role of the critical potential and surface roughness.It can be also of interest to remove selectively from the alloy a single phase leaving a sieve-like matrix. which might itself be porous. The size of the pores and of the remaining solid can be tailored by controlling the grain size of the phases. Examples are given for this second process and experiments are reported on successful selective etching of rapidly solidified Fe-C eutectics.

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“…difference of the two sides of ribbons being either smooth and shiny or corrugated and dull, quenched-in crystals and even nuclei. Studies have recently been conducted on the dealloying behaviour of Pd 30 Ni 50 P 20 glassy ribbons by electrochemical etching [11], on free corrosion of CueZreTi bulk metal glasses in hydrofluoric acid [12] and on TieYeAleCo phase-separated glass after immersion in sulphuric acid [13] showing in all cases the depletion of the less noble elements and the formation of nanoporous structures. Dealloying was also briefly shown to be feasible in a multicomponent Au-alloy, Au 35 Si 20 Cu 28 Ag 7 Pd 5 Co 5 [11].…”

Section: Introductionmentioning

confidence: 99%

Dealloying of an Au-based amorphous alloy

2010

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a b s t r a c tThe dealloying behaviour of Au 42 Cu 29 Ti 8 Si 21 and Au 44 Cu 31 Ti 4 Si 21 amorphous (wheel-side) and partially crystalline (air-side) ribbons was investigated using potentiostatic and galvanostatic etching. The resulting microstructures are: i) on the wheel-side homogeneous porosity with size from tens of nanometers to less than 1 mm in between Au crystals is largely found, ii) on the air-side the porosity occurs on two length-scales, submicrometer as on the opposite size and micrometer where crystals are removed. The importance of surface morphology in the formation of the microstructure is outlined. The role of diffusion and nucleation in the mechanism of surface gold enrichment is established.

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Dealloying of Cu-Zr-Ti Bulk Metallic Glass in Hydrofluoric Acid Solution

Cited by 36 publications

References 16 publications

Atomic structure of Cu–Zr–Ti metallic glasses subjected to high temperature annealing

Atomic structure of Cu–Zr–Ti metallic glasses subjected to high temperature annealing

De-alloying of rapidly solidified amorphous and crystalline alloys

Dealloying of an Au-based amorphous alloy

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