Author
O. Beffort
Bio: O. Beffort is an academic researcher from Swiss Federal Laboratories for Materials Science and Technology. The author has contributed to research in topics: Microstructure & Diamond. The author has an hindex of 19, co-authored 30 publications receiving 1470 citations.
Papers
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TL;DR: In this paper, metal-matrix composites were produced by reinforcing aluminum and aluminum-silicon with diamond single crystals via two different liquid metal infiltration techniques, gas pressure infiltration and mechanically assisted infiltration (squeeze casting).
224 citations
TL;DR: In this article, the shape and distribution of the brittle β-Mg17Al12 has a large influence on mechanical properties and is less detrimental to ductility than the continuous β-phase network found in semi-solid processed parts.
138 citations
TL;DR: In this paper, the authors investigated the interface formation in infiltrated Al-based composites with high-volume fractions of monocrystalline synthetic diamond particles, and discussed the interface characteristics with respect to process conditions and Al matrix chemistry.
125 citations
TL;DR: In this article, the effect of alloying and age hardening for high volume fraction SiC-particle reinforced Al-based metal matrix composites (MMCs) produced by means of pressurized liquid metal infiltration (squeeze casting) is discussed.
111 citations
TL;DR: In this article, the microstructure, morphology and interfacial characteristics of diamond-aluminum composites were studied using TEM and Raman spectroscopy techniques, and the micro-sized diamond particles were observed to be homogeneously dispersed and well bonded in the Al-matrix.
108 citations
Cited by
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TL;DR: In this article, a unified overview of matrix nanocomposites is presented underlining the need for these materials, their processing methods and some recent results on structure, properties and potential applications, perspectives including need for such materials in future space mission and other interesting applications together with market and safety aspects.
Abstract: Nanocomposites, a high performance material exhibit unusual property combinations and unique design possibilities. With an estimated annual growth rate of about 25% and fastest demand to be in engineering plastics and elastomers, their potential is so striking that they are useful in several areas ranging from packaging to biomedical applications. In this unified overview the three types of matrix nanocomposites are presented underlining the need for these materials, their processing methods and some recent results on structure, properties and potential applications, perspectives including need for such materials in future space mission and other interesting applications together with market and safety aspects. Possible uses of natural materials such as clay based minerals, chrysotile and lignocellulosic fibers are highlighted. Being environmentally friendly, applications of nanocomposites offer new technology and business opportunities for several sectors of the aerospace, automotive, electronics and biotechnology industries.
1,032 citations
TL;DR: Friction stir welding (FSW) is an emerging metalworking technique that can provide localized modification and control of microstructures in near-surface layers of processed metallic components.
Abstract: Friction stir processing (FSP), developed based on the basic principles of friction stir welding (FSW), a solid-state joining process originally developed for aluminum alloys, is an emerging metalworking technique that can provide localized modification and control of microstructures in near-surface layers of processed metallic components. The FSP causes intense plastic deformation, material mixing, and thermal exposure, resulting in significant microstructural refinement, densification, and homogeneity of the processed zone. The FSP technique has been successfully used for producing the fine-grained structure and surface composite, modifying the microstructure of materials, and synthesizing the composite and intermetallic compound in situ. In this review article, the current state of the understanding and development of FSP is addressed.
955 citations
TL;DR: In this article, the authors review the equilibrium phase field of various Al-Mg-Si-Cu alloys, noting the many important commercial alloys that contain the Q phase as an equilibrium one.
514 citations
TL;DR: In this paper, most of the significant phenomena that cause heating during microwave-material interaction and heat transfer during microwave energy absorption in materials are discussed. But, the mechanisms associated with the processing are less understood; popular mechanisms such as dipolar heating and conduction heating have been mostly explored.
Abstract: Efforts to use microwaves in material processing are gradually increasing. However, the phenomena associated with the processing are less understood; popular mechanisms such as dipolar heating and conduction heating have been mostly explored. The current paper reviews most of the significant phenomena that cause heating during microwave–material interaction and heat transfer during microwave energy absorption in materials. Mechanisms involved during interaction of microwave with characteristically different materials – metals, non-metals and composites (metal matrix composites, ceramic matrix composites and polymer matrix composites) have been discussed using suitable illustrations. It was observed that while microwave heating of metal based materials is due to the magnetic field based loss effects, dipolar loss and conduction loss are the phenomena associated with the electric field effects in microwave heating of non-metals. Challenges in processing of advanced materials, particularly composites have been identified from the available literature; further research directions with possible benefits have been highlighted.
502 citations
TL;DR: In this article, the development of Al-Si alloy and its based material for engine application is reported, focusing on improving the material's fatigue limit and wear resistance, which are two important properties for engine block materials.
Abstract: The development of Al-Si alloy and its based material for engine application is reported in this paper, focusing on improving the material’s fatigue limit and wear resistance, which are two important properties for engine block materials. The paper begins with a description of the microstructure (primary and eutectic phases, intermetallics, and casting defects) of Al-Si alloy and its effects on this material’s fatigue and wear behaviors. Then, some recent techniques to enhance these two properties are discussed such as alloying, composite production, and casting.
460 citations