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26
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Introduction
Simon Kleiner currently works at the Department of Engineering and Information Technology, Bern University of Applied Sciences. Simon does research in Manufacturing Engineering and Materials Engineering. Their most recent publication is 'Heat Treatment Response of Selectively Laser Melted AlSi10Mg.'
Current institution
Education
September 1994 - March 2003
Publications
Publications (26)
The age-hardenable cast alloy AlSi10Mg is the most widely used alloy for additive manufacturing of aluminium components by means of selective laser melting. Due to the rapid solidification, the material exhibits a fine cellular microstructure, composed of a supersaturated Al-matrix and a network of silicon along the cell boundaries. The temperature...
The age-hardenable cast alloy AlSi10Mg is the most widely used alloy for additive manufacturing of aluminium components by means of selective laser melting. Due to the rapid solidification, the material exhibits a fine cellular microstructure, composed of a supersaturated Al-matrix and a network of silicon along the cell boundaries. The temperature...
In this work we show our result of in-situ nitrocarburizing and nitriding treatments AISI316L specimens. Part of the samples have been depassivated ex-situ and coated with a Ni layer, while other specimens received in-situ depassivation. Processing was carried out in a custom built reaction chamber attached to a Bruker D8 Advance diffractometer. We...
The formation of expanded austenite in Cr-Ni austenitic stainless steels like AISI 316L is not completely understood despite its technological relevance. In this work, we present an in-situ X-ray diffraction study on the growth kinetics of the expanded austenite. We applied a low-temperature nitrocarburizing treatment using a mixture of NH3, N2, H2...
Thermal conductivity of the aluminium–diamond (Al–diamond) composites, prepared by the gas pressure infiltration method, is measured by steady state technique. A detailed theoretical investigation on the heat conduction mechanism across the Al–diamond interface is presented. It was confirmed that both electrons and phonons actively take part in the...
Polymethylsiloxane (PMS) was used as a binder to make self-supporting SiC preforms for pressurized aluminum melt infiltration. The SiC particles were coated with preceramic polymer by spray drying; this ensured a fine and homogeneous distribution coupled with a high yield of the binder. The conditioned SiC powder mixtures were processed into prefor...
With the aim of obtaining materials with high thermal conductivities for solid state thermal management applications, 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 infiltratio...
This study pertains to the investigation of interface formation in infiltrated Al-based composites with high-volume fractions of monocrystalline synthetic diamond particles. The interface characteristics are discussed with respect to process conditions and Al matrix chemistry. To this end, two infiltration techniques, i.e., squeeze-casting and gas...
Reactivity of synthetic diamond single crystals with liquid aluminium is very distinct for the different diamond faces. The {1 1 1} faces are barely attacked by liquid aluminium whereas the {1 0 0} surface atoms are easily dissolved and participate in the formation of carbides resulting in jagged {1 0 0} faces featuring a characteristic morphology...
Diamonds have evolved to an advanced highperformance material with steadily increasing technological and economic impact. Owing to the nature of its atomic bonding structure diamond features unique combinations of physical, mechanical and chemical properties such as extreme hardness, high chemical resistance and exceptional thermal conductivity. Th...
The concept of dispersion strengthening with an in-situ processing approach based on mechanical alloying of Ai-TiO2 followed by hot compaction was described. Microsized Al powder and nanosized TiO2 powder with an average primary particle size of 21 nm were used. High energy ball milling in argon atmosphere caused disagglomeration and incorporation...
The process control agent (PCA) stearic acid has been used to prevent excessive cold welding during mechanical milling of an Al–TiO2 powder mixture. Gradual decomposition of the stearic acid during high-energy ball milling caused contamination of the powder with carbon. The decomposition rate was found to be 3–4 times faster when 2.5wt.% instead of...
An Al-based nanocomposite has been synthesized from Al- and nanosized TiO2-powders using mechanical alloying followed by hot compaction where the highly activated powder mixture undergoes a chemical displacement reaction. The composite material features a homogeneous dispersion of thermally stable nanoscaled hard phases (Al2O3, Al3 Ti) in a ductile...
A hot pressing process has been developed for the fabrication of fully dense aluminium based metallic as well as metal matrix composite (MMC) parts. In particular, this process consists of isostatic hot pressing of a pre-shaped green compact in an incompressible liquid pressure medium. Compaction during hot pressing is enhanced by a controlled amou...
The microstructure evolution of extruded Mg–Al–Zn alloys during reheating into the semisolid state is characterised by a very inhomogeneous solid–liquid distribution upon the early stages of remelting, a considerable amount of entrapped liquid and excellent sphericity of the solid particles. All these features are explained by metallurgical conside...
Deformation anisotropy of extruded Mg–6% Al–1% Zn alloy has been investigated on specimens with different tilt angles relative to the extrusion direction. Calculations of the orientation factors for basal slip and of the strains caused by twinning were done for a slightly idealised texture. This quantification of the two dominating deformation mode...
A comparison of semi-solid metal processing of aluminum alloy A356 and magnesium alloy AZ91 was presented. Semi-solid processing and the properties of the components were significantly influenced by the presence and morphology of eutectic phases. It was found that the established aluminum alloy A356 was suitable for semi-solid casting and its mecha...
Magnesium–aluminium castings produced by means of squeeze casting, new rheocasting and thixocasting have been investigated. These casting processes provide very different microstructures consisting of α-Mg and β-Mg17Al12. The shape and distribution of the brittle β-Mg17Al12 has a large influence on mechanical properties. Isolated particles of β-pha...
Summary Extruded magnesium alloys of the AZ-series are suitable feedstock materials for thixocasting. The characteristics of the feedstock material and its behaviour during inductive reheating into the semi-solid temperature range have been investigated. Reheating can be done without any protective gas by using a closed slug container, which also e...
Extruded magnesium alloys of the AZ-series are suitable feedstock materials for thixocasting. The characteristics of the feedstock material and its behaviour during inductive reheating into the semi-solid temperature range have been investigated. Reheating can be done without any protective gas by using a closed slug container, which also ensures s...
Three-stage heating and cooling pretreatment, finally stabilizing the grain structure under reducing temperature, for at least 420 hrs, preferably for 1000 hrs, produces stabilized grain structure with good mechanical properties: hardness HB up to 65 (2.5/62.5/16); limiting expansion Rp0.2 up to 140 MPa, preferably 130 MPa; tensile strength Rm up t...
