Topic
Alloy
About: Alloy is a research topic. Over the lifetime, 171884 publications have been published within this topic receiving 1719420 citations. The topic is also known as: alloys.
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TL;DR: In this paper, the regular solution theory of alloys was used to show that segregation of the more volatile constituent to the surface of a bulk alloy or small alloy particle, a microcluster alloy, may occur for all alloy systems, regardless of temperature.
169 citations
TL;DR: In this article, a β-homogeneous microstructure is obtained in the whole sample with the increase of sintering temperature, and the results show that a β homogeneous micro-stabilizers (Nb and Ta) dissolution is obtained at low Sintering temperatures, there is the formation of an intermediary Widmanstatten (α+β) phase.
169 citations
TL;DR: In this article, a CoCrFeNi high entropy alloy matrix self-lubricating composite was prepared by spark plasma sintering using a mixture of co-correlated graphite and MoS 2 powder.
169 citations
TL;DR: High strength Mg-Ca-Zn alloys with medically acceptable corrosion rate were developed and showed great potential for use in a new generation of biodegradable implants.
Abstract: Crystalline Mg-based alloys with a distinct reduction in hydrogen evolution were prepared through both electrochemical and microstructural engineering of the constituent phases. The addition of Zn to Mg-Ca alloy modified the corrosion potentials of two constituent phases (Mg + Mg2Ca), which prevented the formation of a galvanic circuit and achieved a comparable corrosion rate to high purity Mg. Furthermore, effective grain refinement induced by the extrusion allowed the achievement of much lower corrosion rate than high purity Mg. Animal studies confirmed the large reduction in hydrogen evolution and revealed good tissue compatibility with increased bone deposition around the newly developed Mg alloy implants. Thus, high strength Mg-Ca-Zn alloys with medically acceptable corrosion rate were developed and showed great potential for use in a new generation of biodegradable implants.
169 citations
TL;DR: The work systematically explores the nature of surface layers on magnesium rare-earth alloys formed in complex SBFs, with the aim to elucidate the influence of specific electrolyte components on the morphology, structure, and composition of corrosion layers on Mg alloys.
Abstract: In this study, the composition of corrosion product layers on a magnesium rare-earth alloy in simulated body fluid (m-SBF) containing albumin in physiological concentration is examined. The time dependence of the composition of the layer is studied. The ions from the body fluid that participate in the corrosion layer formation were identified by analyzing layers formed in different solutions that contain only some of the ions of SBF. The layer composition was analyzed by different complementary methods. We used energy dispersive X-ray analysis, grazing incidence X-ray diffraction, and Fourier transform infrared spectroscopy. The morphology of the corrosion layers was studied using scanning electron microscopy and light microscopy. In m-SBF with and without albumin we found an amorphous layer of carbonated calcium phosphate with some calcium replaced by magnesium. It can be clearly shown that calcium is only deposited in the corrosion layer if phosphates are in the solution. The cross-sections reveal that there are some sharp crevices in the substrate. The work systematically explores the nature of surface layers on magnesium rare-earth alloys formed in complex SBFs, with the aim to elucidate the influence of specific electrolyte components on the morphology, structure, and composition of corrosion layers on Mg alloys. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res 2009
169 citations