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Yasmin Ahmed Salem, M.A.
Yasmin Ahmed Salem
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Phone: +49 211 6792 722
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Scientific Events

Scientific Events

Month:

Spatially Resolved Texture and Microstructure Evolution of Additively Manufactured and Gas Gun Deformed 304L Stainless Steel; Investigated by Neutron Diffraction and Electron Backscatter Diffraction

Nitride coatings based on high-entropy alloys

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Nitride coatings based on high-entropy alloys

The new alloying concept, known as high-entropy alloys (HEAs) or multi-principal elements alloys (MPEAs) are a new emerging class of perspective materials that possess a wide range of unique properties. Since the appearance of the first studies of HEAs, more than 1000 scientific works were published. It was investigated relationship between microstructure of new alloys, which can include SS (with BCC, FCC and HCP structures), IM and even amorphous state and their physical properties. It was shown that the HEAs possess different outstanding functional properties, like superconductivity with transition temperature Tc = 7.3 K, high level electrical resistivity, high saturated magnetization, high corrosion resistance, good hydrogen storage properties, as a template for graphene production. For achievement superior mechanical behavior and thermal stability it was designed and produced protective coatings based on HEAs. However, the research of nitride coatings based on HEA are still very limited. Clearly, the understanding of features of microstructure such non-homogeneous complex systems is essential in order to move in the improvement of the physical properties of high-entropy thin films with different intrinsic architecture. [more]

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Summer School on Experimental Nano- and Micromechanics

The size dependent mechanical response of materials has attracted strong attention during the past decade. While past research focused mainly on single crystalline behavior, today´s investigations target the mechanical response and underlying deformation mechanisms of heterogeneous microstructures. The summer school is aimed at providing a comprehensive overview on experimental nano- and micromechanical testing methods. Focus thereby is put on material properties which can be reliably extracted from in situ micromechanical experiments. - Which properties can we experimentally explore? - Where are the limits and pitfalls of our methods? - Where do we need support of simulation techniques? - What are future challenges in the field? The school will deal with nanoindentation as well as methods to explore the plastic and fracture properties of materials and interfaces, frequently used characterization techniques with in situ capabilities and, finally, simulation techniques. [more]

Alloys for Additive Manufacturing Symposium 2017

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AAMS17

As Additive Manufacturing technologies are being adopted in more and more industries, the focus of research and development is shifting to the materials in use. Additionally, an increasing number of researchers in academia and industry realise the potential of Additive Manufacturing to produce materials that were heretofore inaccessible by conventional manufacturing techniques or not economically feasible. The Alloys for Additive Manufacturing Symposium aims to be a venue for the discussion of these issues by researchers in academia and application. All materials scientific issues pertaining to the additive manufacturing of metals, alloys and composites including a metallic phase fall under the scope of this conference. [more]

Introducing high temperature intermetallic eutectic as potential structural materials

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Introducing high temperature intermetallic eutectic as potential structural materials

Intermetallic fascinated high temperature materials community for the last five decades. Starting with gamma TiAl, both Ti based and Ni based single phase intermetallics have been subject of extensive investigation. It took five decades for actual application in latest generation GE engine. However, very little attention has been given to multiphase multicomponent intermetallics. These, in particular eutectics, are abundant in the central regions of phase diagrams of ternary and higher components. With a hypothesis that they represent exciting opportunity, this talk will present the outline of our fairly extensive efforts in developing high temperature intermetallic composites based on a novel design of materials through microstructural engineering of intermetallics at nano scale. We shall concentrate on the Ni-Al-Zr system and show that unique complex multiphase microstructures could be developed containing intermetallics of Ni3Al, Ni5Zr, Ni7Zr2 and NiAl. The microstructures contain single or multiple coupled eutectics that are distributed seamlessly along the entire samples. For example, for an alloy Ni-12At%Al-11at%Zr, two intermetallic phases (Ni3Al and Ni5Zr) are seamlessly distributed along the entire sample with two different length scales and morphologies. Often these microstructures can be visualised by a 3D analysis that shows variations of connectivity among phases. Many of these alloys show strength in excess of 2GPa This architecture exhibits excellent high temperature microstructural stability, exceptional high strength with reasonable tensile ductility at high temperature. We show that this can be derived from an approach designed to exploit eutectic reactions that combine Intermetallics in a microstructural scale that restricts slip lengths to obtain both strength and ductility. Some of these alloys also have exceptional oxidation resistance that is retained up to a temperature of 973K. Finally we shall present some results of creep strength of these alloy that hints at the stress induced transformation. [more]

3D materials characterization at all length scales and its applications to iron and steel

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Symposium: 3D materials characterization at all length scales and its applications to iron and steel

The atomic and micro-scale structures of most materials are 3D, but a lack of tools for experimental 3D investigation of materials has limited most published research, including simulation and modelling, to 2D datasets. In the 21st century this situation has changed significantly. New 3D characterization and modelling methods are generating powerful insights into materials properties and microstructure formation on all length scales. [more]

 
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