In September I concentrated on investigating a series of 7475 alloy samples sintered freely in different atmospheres (argon, nitrogen) and at different temperatures (540 - 640oC). Optical microscopy observations and scanning electron microscopy investigations were performed. The lowest pore content was noticed in Ar-atmosphere samples sintered above 600oC (samples sintered under N2 atmosphere had generally more porosity). There was no aluminium nitride phase (in N2- sintered samples) detected using EDS analysis.

My research in september:
-Study of stability of homogeneous citrate solutions by UV-Vis spectroscopy method, in the following solutions:
1) 0,25 M Na3HCit; pH=5;
2) 0,65 M Na3HCit; pH=5;
3) 0,65 M Na3HCit; 0,02 M Na2MoO4; pH=5;
4) 0,25 M Na3HCit; 0,02 M Na2MoO4; pH=5;
5) 0,65 M Na3HCit; 0,1 M Na2MoO4; pH=5;
6) 0,25 M Na3HCit; 0,1 M Na2MoO4; pH=5;
7) 0,65 M Na3HCit; 0,24 M Na2MoO4; pH=5;
8) 0,25 M Na3HCit; 0,24 M Na2MoO4; pH=5;
9) 0,65 M Na3HCit; 0,08 M SnSO4; pH=5;
10) 0,65 M Na3HCit; 0,24 M Na2MoO4; 0,08 M SnSO4; pH=5;
11) 0,65 M Na3HCit; 0,16 M ZnSO4; pH=5;
12) 0,65 M Na3HCit; 0,24 M Na2MoO4; 0,16 M ZnSO4; pH=5;
13) 0,65 M Na3HCit; 0,16 M ZnSO4; 0,08 M SnSO4; pH=5;
14) 0,65 M Na3HCit; 0,24 M Na2MoO4; 0,16 M ZnSO4; 0,08 M SnSO4; pH=5;
15) 0,65 M Na3HCit; 0,24 M Na2MoO4; 0,16 M ZnSO4; 0,08 M SnSO4; ¬0,12 M Na2SO3; pH=5;
- study of the complex formation and its stability in various citrate system by cyclic voltammetry with rotating disc electrode method , in the following solutions:
1) 0,65 M Na3HCit; pH=5;
2) 0,65 M Na3HCit; 0,24 M Na2MoO4; pH=5;
3) 0,65 M Na3HCit; 0,08 M SnSO4; pH=5;
4) 0,65 M Na3HCit; 0,24 M Na2MoO4; 0,08 M SnSO4; pH=5;
5) 0,65 M Na3HCit; 0,16 M ZnSO4; pH=5;
6) 0,65 M Na3HCit; 0,24 M Na2MoO4; 0,16 M ZnSO4; pH=5;
7) 0,65 M Na3HCit; 0,08 M SnSO4; 0,16 M ZnSO4; pH=5;
8) 0,65 M Na3HCit; 0,24 M Na2MoO4; 0,08 M SnSO4; 0,16 M ZnSO4; pH=5;
9) 0,65 M Na3HCit; 0,02 M C3H6O; pH=5;
10) 0,65 M Na3HCit; ¬0,12 M Na2SO3; pH=5;
11) 0,65 M Na3HCit; 0,24 M Na2MoO4; ¬0,12 M Na2SO3; pH=5;
12) 0,65 M Na3HCit; 0,08 M SnSO4; ¬0,12 M Na2SO3; pH=5;
13) 0,65 M Na3HCit; 0,24 M Na2MoO4; 0,08 M SnSO4; ¬0,12 M Na2SO3; pH=5;
14) 0,65 M Na3HCit; 0,16 M ZnSO4; ¬0,12 M Na2SO3; pH=5;
15) 0,65 M Na3HCit; 0,24 M Na2MoO4; 0,16 M ZnSO4; ¬0,12 M Na2SO3; pH=5;
16) 0,65 M Na3HCit; 0,08 M SnSO4; 0,16 M ZnSO4; ¬0,12 M Na2SO3; pH=5;
17) 0,65 M Na3HCit; 0,24 M Na2MoO4; 0,08 M SnSO4; 0,16 M ZnSO4; ¬0,12 M Na2SO3; pH=5;

Research in September:

- preparation of samples of AA1050 alloy to observations with the high resolution scanning electron microscopy equipped with the local orientation measurements facility - grinding, polishing;

- preparation of orientation maps of aluminum alloy after ECAP and recrystallization (new and constant time = 1h);

- analysis of microstructures after deformation and during recrystallization of AA1050 aluminium processed by equal-channel angular pressing (ECAP);

Conference:

- preparation of the presentation under the title: ‘Structural changes in recrystallization of AA1050 aluminium alloy processed by ECAP’ for the 39th School in Materials Science in Krynica;

- attending in 39th School in Materials Science (Krynica 27-30.09.2011).

Main studies carried out during September:

- preparation of thin foils by electropolishing from ribbons samples with vanadium, molybdenum, titanium, zirconium and chromium addition for observation with Transmission Electron Microscopy

- microstructure observation of melt-spun ribbon with Cr addition using TEM, determination of phases chemical composition

- participation in 10th Multinational Congress on Microscopy in Urbino in Italy (4-9.09.2011), during conference attendance in poster session with the poster: “TEM study of the quasicrystalline phase transformation in Al-Mn-Fe melt-spun ribbon”.

- preparation of the article and oral presentation for the 39th School in Materials Science in Krynica, with the title: “Microstructure, mechanical properties and thermal stability of Al-Mn-Fe melt-spun ribbons”.

- participation in 39th School in Materials Science in Krynica (27-30.09.2011), during session A (non-ferrous metal alloys) oral presentation was given with the title mentioned above

- preparation of article for Archives of Metallurgy and Materials with the title: “Characterization of as-spun and annealed Al-Mn-Fe ribbon”.

Whole month was spent on reading scientific literature about my topic. I was focused on the information about morfology and energies of grain boundaries in polycrystalline samples.