Peter Rogl: Crystal chemistry and properties of G-phases
YUCOMAT 2021
Herceg Novi, Montenegro, 2021
YUCOMAT 2021
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YUCOMAT 2021
Competition : : Best Poster Presentation
YUCOMAT 2021
Competition : : Best Poster Presentation
YUCOMAT 2021
MRS Serbia
YUCOMAT 2021
Competition : : Best Poster Presentation
YUCOMAT 2021
Yury Gogotsi - Award for a Lasting and Outstanding Contribution to Materials Science and Engineering
YUCOMAT 2021
Herceg Novi, Montenegro, 2021
YUCOMAT 2021
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YUCOMAT 2021
Herceg Novi, Montenegro, 2021
YUCOMAT 2021
Audience
YUCOMAT 2021
Discussion
YUCOMAT 2021
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YUCOMAT 2021
Poster Session
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Discussion
YUCOMAT 2021
Audience - outside
YUCOMAT 2021
MRS Serbia
YUCOMAT 2021
Discussion
YUCOMAT 2021
Herceg Novi, Montenegro
YUCOMAT 2021
In Between
YUCOMAT 2021
MRS Serbia
YUCOMAT 2021
Herceg Novi, Montenegro
YUCOMAT 2021
MRS Serbia
YUCOMAT 2021
Audience
YUCOMAT 2021
Herceg Novi, Montenegro

P. Rogl and A. Grytsiv

 

Inst. of Materials Chemistry, University of Vienna, A-1090 Wien, Austria

 

Socalled G-phases (Th6Mn23-type and ordered derivatives with Mg6Cu16Si7-type, all space group Fm-3m) constitute a large class of intermetallic compounds comprising aluminides, gallides, silicides, germanides and stannides.

Our systematic investigation (phase relations, X-ray single crystal structure analysis, neutron powder diffraction) of titanium based transition metal (TM) aluminide solid solutions Ti6{TM,Al}~23 however, revealed a filled variant of the Th6Mn23 type (space group Fm-3m) for the Al-rich single-phase region, whereas a novel structure variant with space group F-43m was established for the Ti-rich side of the G-phase region. The direct group-subgroup relation between space groups Fm-3m and F-43m may favour a second order phase transition.

In contrast to the various structure variants observed for titanium aluminium-based G-phases Ti6({Fe,Co,Ni,Ru,Rh,Pd,Os,Ir,Pt}1xAlx)23+1 and Ti6Ni16+xSi7, the G-phase Mn6Ni16Si7 was confirmed to crystallize as a simple ordered variant of the Th6Mn23 structure type.

It should be noted that the ternary intermetallic G-phase silicide precipitates preferentially at grain boundaries and dislocations in both ferrite and austenite of duplex stainless steels and recently gained significant interest for ultra-high strength steels.

In view of applications, the presentation will provide a comprehensive overview on the structural chemistry of G-phases, particularly focusing on aluminides and silicides covering also stannides.

Plenary lectures - YUCOMAT 2019

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