Properties and applications of some gold alloys modified by rare earth additions

Yuantao, Ning

doi:10.1007/bf03215221

Cited by 35 publications

(22 citation statements)

References 6 publications

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“…3, the microhardness of pure Au, slowly solidified Au-La and rapidly solidified Au-La is presented. From these results, the high strengthening effect achieved by La and additional strengthening by rapid solidification can be determined as is predicted, besides a small loss of La during rapid solidification by melt spinning [17]. Pure Au has almost three times lower hardness in comparison to Au-0.5 wt% La, which reached up to 79 HV.…”

Section: Microhardness Of Au-la Alloysmentioning

confidence: 81%

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Microstructure and biocompatibility of gold–lanthanum strips

et al. 2014

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Microalloying of pure gold, which has the highest biocompatibility but relatively low yield strength and poor wear resistance, might improve its applicability as adornments and biomedical implants. The objective of this study was to analyse the microstructure and biocompatibility of gold-lanthanum (Au-0.5 wt% La) microstrips as a potential biomaterial in dentistry or medicine. We found that microalloying of Au with La produced very fine nanosized grains homogeneously dispersed through the entire volume of the rapidly solidified (RS) alloys. This initiates the formation of Au 6 La phase which increases strength and hardness of the alloy significantly. By RS, large reduction of grains and microsegregation increases the strength of the alloy additionally. Our results suggest that Au-La microstrips, although non-cytotoxic for L929 cells, rat thymocytes, rat peritoneal macrophages (PMØ) and human peripheral blood mononuclear cells (PBMNCs), can activate immune cells. Namely, RS Au-La microstrips stimulated the production of nitric oxide (NO) by PMØ. Using a model of phytohemaglutinine (PHA)-stimulated human PBMNCs, we found that RS Au-La strips increased the proliferation of these cells and stimulated the production of Th1, Th17 cytokines, and immunoregulatory cytokine IL-10. Our results suggest that RS Au-La microstrips are biocompatible, but they can modulate the immune response. Therefore, their use as potential implants should be considered carefully.

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Section: Microhardness Of Au-la Alloysmentioning

confidence: 81%

“…Rapid solidification in such a system can also have an effect on the fraction of eutectic and its phase composition [17]. If, in such condition, gold solutes over 0.5 wt% of La at eutectic temperature, eutectic reaction could be bypassed.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and biocompatibility of gold–lanthanum strips

et al. 2014

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“…All results have been reported here calculated using Vienna Ab-initio Simulation Package (VASP) which implements Density Functional Theory (DFT) [4][5][6]. The plane wave based pseudo-potential method has been used for the total energy calculations.…”

Section: Calculation Methods *mentioning

confidence: 99%

An Ab-initio study on UAl for nuclear applications

2017

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Abstract:The structural, elastic, electronic and bonding nature and vibrational properties of UAl in B2 structure under zero pressure have been investigated by performing first principles calculations using density functional theory. The exchange-correlation potentials were treated within the generalized gradient approximation (GGA). The calculated quantities are agreed well with the available results. The electronic properties such as band structure and density of states reveal that UAl is metallic in nature with large overlap at Fermi level. The single-crystal elastic stiffness constants of UAl are investigated using stress-strain method. Present results for elastic constants show that this compound is mechanically metastable which is agreement with previous study [3]. The chemical bonding is interpreted by calculating the density of states and electron density distribution analysis. UAl has metallic bonding characteristic. The presented phonon dispersion curves and one-phonon DOS is also confirmed that this compound is dynamically unstable.

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“…In the binary phase diagrams of Ni or Cr with Gd, a series of eutectic systems and intermetallics are formed in the respective binary system with very small solid solubility of Gd in the metals. In the Au-Gd binary phase diagram, Figure1, at the gold-rich end of the Au-Gd system, (Au)+Au 6 Gd eutectic forms with a eutectic temperature of 804°C. Gd has a maximum solid solubility of 0.7at% (0.6wt %) Gd in gold at the eutectic temperature, but a very low solubility as the temperature falls [7,8].…”

Section: Influence Of Gd Additions On the Structure Of Au-ni And Au-nmentioning

confidence: 99%

“…It has been shown that microalloying via rare earth metal additions to gold increases not only the mechanical properties but also maintains good stability of electrical conductivity [3][4][5][6]. Based on this research, improved Au-Ni and Au-Ni-Cr alloys modified by RE additions have been developed.…”

Section: Introductionmentioning

confidence: 99%

Influence of gd addition on the structure and properties of Au-Ni and Au−Ni−Cr alloys

Yuantao

2006

Gold Bull

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The influence of Gd additions on the microstructure and properties of Au-Ni and Au-Ni-Cr alloys are reported. The alloys remain single phase solid solution at Gd contents of ≤0.1wt%, but at contents > 0.1%, two phases structures are formed, consisting of (Au) and a low melting point intermetallic compound containing Gd. Trace additions of Gd refine the grain size, increase strength and the recrystallization temperature, but without detriment to the good electric conductivity of these alloys. The wear life of potentiometer windings made of gold alloys containing Gd are at least one order of magnitude higher than those made in the Gd-free gold alloys. The design of gold alloys for precise electrical contact and resistance materials by conventional and microalloying is discussed.

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Properties and applications of some gold alloys modified by rare earth additions

Cited by 35 publications

References 6 publications

Microstructure and biocompatibility of gold–lanthanum strips

Microstructure and biocompatibility of gold–lanthanum strips

An Ab-initio study on UAl for nuclear applications

Influence of gd addition on the structure and properties of Au-Ni and Au−Ni−Cr alloys

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