The Metallurgy of Gold

Grimwade, Mark

doi:10.1179/030801892791925312

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…Copper alloys 130,131 are less resistant to corrosion 132 and less efficient; other shape memory alloys containing gold are not practical for commercial use because of the prohibitive cost. [133][134][135] As a result, the burgeoning technology of shape memory polymers will play an important role in the future of shape memory in the field of medicine. [136][137][138][139] For example, in cardiovascular applications, the low molecular weight of the polymers would undoubtedly have better compatibility and greater potential than metals.…”

Section: Shape Memory Alloys That Do Not Contain Nickelmentioning

confidence: 99%

Shape memory alloys: Properties and biomedical applications

Mantovani

2000

JOM

217

103

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Shape memory alloys provide new insights for the design of biomaterials in bioengineering for the design of artificial organs and advanced surgical instruments, since they have specific characteristics and unusual properties. This article will examine (a) the four properties of shape memory alloys, (b) medical applications with high potential for improving the present and future quality of life, and (c) concerns regarding the biocompatibility properties of nickel-titanium alloys. In particular, the long-term challenges of using shape memory alloys will be discussed, regarding corrosion and potential leakage of elements and ions that could be toxic to cells, tissues and organs.

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Section: Shape Memory Alloys That Do Not Contain Nickelmentioning

confidence: 99%

Shape memory alloys: Properties and biomedical applications

Mantovani

2000

JOM

217

103

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“…In effect, gold and topper have much higher reflectivities for the low-energy end of the visible spectrum, conferring the unique property of colour on them [21]. Alloying additions to copper and gold progressivelỳ bleach' their colour by modifying the electronic band structure, shiftïng the reflected wavelengths to the ultra-violet region of the spectrum.…”

Section: Colourmentioning

confidence: 99%

The development of Spangold

Wolff

Cortie

1994

Gold Bull

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The underlying mechanisms of martensitic phase transformations in gold alloys have attracted a great deal of study. Whereas their technological exploitation in shape-memory devices has found only limited application, the Spangold concept introduces a novel application -that of using the transformation to decorate gold ornaments. This article examines the attributes of suitable alloys and the development of a prototype alloy for use in jewellery.

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“…An optimal choice of the parameters in the annealing process is important in order to control the re-ordering of the alloy's microstructure or the precipitation of secondary phases [3]. This can be guaranteed by using a temperature above the ordering or immiscibility field of the alloy system and by a rapid quenching from the annealing temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructure and residual stresses, generated from different annealing and deformation processes, on the corrosion and mechanical properties of gold welding alloy wires

et al. 2015

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Gold welding alloys, which are used in the production of both hollow and solid gold chains, affect the optical and mechanical properties of various gold products because the corrosion resistance of the individual links depends on these properties. It is important that welding alloys with high corrosion resistance do not degrade during or after the production process. The mechanical properties of gold welding alloy wires are strongly influenced by the alloy microstructure, which has a key role in both the machinability and the quality of the wires. In the presented work, various physical and mechanical properties of gold originating from different industrial deformation processes are evaluated. Specifically, various plastic deformation grades caused by different annealing and rolling steps are analyzed. The change of the temperature, time, and velocity parameters in the annealing and lamination processes leads to the formation of different levels of residual stresses in the material, which can generate a variation in the corrosion properties of the gold wires. The change in microstructure, due to the different annealing and rolling steps, is analyzed by optical microscope (OM) and SEM observations. The residual stresses are evaluated using XRD analysis, and the variations of the mechanical properties by micro-hardness tests. The corrosion resistance is evaluated by potentiodynamic polarization tests, in which an electrolyte solution is used to simulate human sweat. Small grain size and high homogeneity of the microstructure are preferred for the final products. In this study, the samples that have been produced are shown to have lower levels of residual stresses and feature higher corrosion resistance and more favorable mechanical properties.

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The Metallurgy of Gold

Cited by 3 publications

References 22 publications

Shape memory alloys: Properties and biomedical applications

Shape memory alloys: Properties and biomedical applications

The development of Spangold

Effect of microstructure and residual stresses, generated from different annealing and deformation processes, on the corrosion and mechanical properties of gold welding alloy wires

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