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Mechanical anisotropy and segregation in Mo5Si3 studied by EBSD

Erik Ström (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Ji Zhang
Intermetallics Vol. 13 (2005), 3-4, p. 367-372.
[Artikel, refereegranskad vetenskaplig]

The cracking behaviour of indented areas in monolithic Mo5Si3 and segregation in Cr-alloyed Mo5Si3 have been studied by electron back-scattering diffraction (EBSD) in a scanning electron microscope (SEM). Vickers indentation of Mo5Si3 indicates preferred cleavage across the [001] direction, resulting in chipping if the indent is normal to the (001) plane. The other two alloyed Mo5Si3-based compounds studied in this work, i.e. Mo3Cr2Si3 and Mo3Ti2Si3, behave differently during heat treatment. Mo3Cr2Si3, on the one hand, shows unexpected additional X-ray reflections together with broadening of reflections after annealing, when compared to its as-cast condition. Observations of increased segregation upon annealing are made, presumably by a separation into Cr-lean and Cr-enriched (Mo,Cr)5Si3, especially in the <100> directions according to EBSD. Segregation of Cr is linked to additional reflections in X-ray diffraction (XRD). Mo3Ti2Si3, on the other, seems to be in chemical equilibrium in the as-cast state according to energy dispersive spectrometry (EDS) measurements, and there is little difference in XRD between as-cast and heat treated alloys.

Nyckelord: Molybdenum silicides, Ternary alloy systems, Anisotropy, Crystallographic texture, Diffraction



Denna post skapades 2006-09-12.
CPL Pubid: 11679

 

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Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Ämnesområden

Materialteknik

Chalmers infrastruktur