Scientific blog
PhD report (March 2011) Marta Gajewska 
Thursday, 7 April, 2011, 13:33
Posted by Marta Gajewska
My research:

Composite powders - 7475 aluminium alloy powder with 10 wt.% and 20 wt.% addition of aluminum nitride powder subjected to high energy ball milling - were compacted in a VEB 40 hydraulic uniaxial press in a mould placed in a vacuum and heated using a high frequency generator. Discs about 5mm thick, 20 mm in diameter were obtained after hot pressing in a vacuum of 10-2 bar, at a pressure of 600 MPa and temperature of 380oC.
The microstructure of the hot compacted composites was characterized using an FEI E-SEM XL30 scanning electron microscope and a Tecnai G2 F20 (200kV) transmission electron microscope equipped with an integrated EDAX system. Thin foils for TEM investigations were prepared by mechanical polishing, dimpling with a Gatan Dimple Grinder (Model 656) and finally ion Ar milling with a Leica EM RES101 system.
Microhardness Vickers measurements were performed using a CSM-Instruments tester.

Seminars/meetings:

Third meeting of “Local Composite Platform”:
- presentation on ”Mechanical properties of metal-ceramics cast composites” by Pawel Kurtyka
IMMS seminars:
- “Investigations on the catalytic Au/TiO2 modelsystem” by Piotr Bobrowski
- “Atomistic simulations of the process of phase separation in the Fe-Cr system” by Rafal Abram,
- “Influence of technological factors on the wettability of soldering” by Artur Kudyba.

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