The development of Spangold

Wolff, I. M.; Cortie, Michael B.

doi:10.1007/bf03214729

Cited by 41 publications

(25 citation statements)

References 15 publications

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“…Tie lines could be established for Sample 4, the microstructure of which is shown in Figure 8(a), and the Al 2 Au phase in that sample could also be readily identified by optical microscopy of polished sections on account of its purple colour. In contrast, the patches of γ+Al 2 Au eutectic in Sample 3 were too fine in scale for analysis of individual components, and in any case the Al 2 Au in that sample largely dissolved into the γ matrix on annealing at 750˚C.…”

Section: γ-Phasementioning

confidence: 97%

“…This has enabled a wide range of uses for these materials, with applications ranging from under-wires of bras to arterial stents and intricate jewellery [2][3][4][5][6]. However, there are some limitations due to the fact that many SMAs suffer from aging and martensite stabilization [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…One alloy that resists these problems is Spangold, a SMA with a nominal composition of Au 7 Cu 5 Al 4, which makes it an 18 karat gold [2]. While the 18 K aspect gives Spangold some potential for use in the jewellery industry, for technological applications the attribute of greater interest is that it appears to be relatively resistant to both decomposition and aging [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Ternary β and γ phases in the Al–Au–Cu system at 750°C

Bhatia

Kealley

Wuhrer

et al. 2009

Journal of Alloys and Compounds

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There are many aspects of the phases and phase boundaries of the Al-Au-Cu ternary system that are still unknown. Although a 500˚C isothermal section and an 18 karat pseudobinary have been reported, many of the other constitutive relationships within the ternary are uncertain. Another unresolved issue is the range of compositions that can possibly serve as shape memory alloys. Here we investigate the constitutive relationships in this system at 750˚C. We confirm that the γ and β phases extend deep into the ternary but that the other known compounds are largely confined to the binary edges. The suitability of β-phase compositions of lower Au content for shape memory service is established.Keywords: (A) metals and alloys, (C) shape memory, (C) phase diagrams, (D) scanning electron microscopy, SEM

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Section: γ-Phasementioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ternary β and γ phases in the Al–Au–Cu system at 750°C

Bhatia

Kealley

Wuhrer

et al. 2009

Journal of Alloys and Compounds

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“…as 'Spangold' (44,45). Two different colours are produced by these intermetallic compounds: a yellow 76Au-19Cu-5Al alloy, and a pink 76Au-18Cu-6Al alloy.…”

Section: Figure 15 Secondary Electron Image Of As-cast Au-25 Per Centmentioning

confidence: 99%

Coloured gold alloys

1999

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From ancient times, gold has been used mostly in decorative items, and the colour of gold plays an important role in this application field. Different methods have been developed to objectively characterize the colour. This paper describes the CIELAB system, which has gained acceptance as an effective way to assess colour. The different coloured gold alloys known today are also described, with emphasis on the relationship between their metallurgy and their colour.

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“…Au 7 Cu 5 Al 4 (sometimes called 'Spangold' [1]) is a less well-known example of a SMA. It has been shown to be relatively resistant to aging compared to its copper-based counterparts and has been previously studied in its bulk form [2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Thin Films of AuCuAl Shape Memory Alloy for Use in Plasmonic Nano-actuators

et al. 2011

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We describe the fabrication and structure of nanoscale thin films of β phase shape memory alloys with the nominal atomic stoichiometry Au 7 Cu 5 Al 4 (corresponding to 5.8 wt% Al). These alloys possess properties that suggest they could be used in nanoscale actuators. The films described here are between 20 and 50 nm thick which is below the thickness at which some other shape memory alloys cease to transform. However, microstructural and X-ray studies confirm that the coatings still exhibit the displacive transformations that are a prerequisite for the shape memory effect.

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The development of Spangold

Cited by 41 publications

References 15 publications

Ternary β and γ phases in the Al–Au–Cu system at 750°C

Ternary β and γ phases in the Al–Au–Cu system at 750°C

Coloured gold alloys

Thin Films of AuCuAl Shape Memory Alloy for Use in Plasmonic Nano-actuators

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