Seminarium ACMiN

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Akademickie Centrum Materiałów i Nanotechnologii AGH zaprasza na seminarium, które odbędzie się 22 stycznia 2015 r. o godz. 15.00.

 

Seminarium podzielone będzie na dwie części. Prof. Ján Dusza (Institute of Materials Research, Slovak Academy of Sciences, Košice, Słowacja) wygłosi referat „Nano-indentation and micropillar testing of WC grains in WC - Co system”. Z drugim referatem pt. „Nanostructured ceramics in BAY ZOLTAN Ltd for Applied Research: Structure and Properties” wystąpi dr Csaba Balázsi (Institute for Materials Science and Technology BAY-ATI, Budapeszt, Węgry).

 

Miejsce: ul. Kawiory 30, budynek D-16, godz.15:00, w Sala Audytoryjna ACMiN (s.1.02A).

 

Część 1 – Nano-indentation and micropillar testing of WC grains in WC - Co system

 

The hardness, reduced modulus and indentation fatigue of the WC grains of WC – Co cemented carbide have been investigated using instrumented indentation on nano level at applied loads from 0.25 mN to 50 mN. The influence of indentation load, microstructure, heat treatment and crystallographic orientation of WC crystals/grains has been studied. The results were compared to the results of micro-compression test of single crystal tungsten-carbide micropillars prepared by focused ion beam from oriented facets of WC grains.
SEM, AFM, FIB, TEM and EBSD methods were used for the characterization of the microstructures and indents deformation and damage mechanisms of micropillars and for the identification of crystallographic orientation of WC grains, respectively.
Significant influence of the crystallographic orientation of WC crystals on the hardness, indentation modulus and indentation fatigue has been found with larger hardness and reduced modulus in basal plane.
The nanohardness values of the basal and prismatic planes of individual WC grains at load of 10 mN were ~40 GPa and ~32 GPa, respectively. During the micropillar testing similarly a strong influence of the orientation of WC on Young’s modulus, yield and rupture stress values was found, with higher values for pillars with axes orientated perpendicularly to the basal plane of the WC grains. The different properties of the basal and prismatic planes was found to be connected with the different deformation mechanisms – slip and dislocation activities.

 

Część 2 – Nanostructured ceramics in BAY ZOLTAN Ltd for Applied Research: Structure and Properties

 

Bay Zoltán Applied Research Nonprofit Ltd. is the leading applied research institute of Hungary. The Materials Science and Technology Institute is a member institute located in Budapest. Its mission is to play a leading role in the materials science and technology innovation chain in the fields as laser technology, polymer technology, electrochemistry, and environmental technology.

 

Our activities in materials science are focusing mainly on
1) development of laser welding/cladding/3D cutting and surface modification of parts consisting of materials of different types and/or composition
2) development of polymer composites, chemical modification of their component.
3) development of small sized injection molded parts
4) development of production technologies of nano-structured metal, alloy and magnetic multilayers
5) production technologies of nano-structured materials by physical or chemical methods, and their investigation in cooperation with other research institutes
6) development of analytical monitoring tools and technologies for environmental purposes
7) qualification technologies related to renewable energy (primarily solar collectors)

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