Microstructural and analytical study of boron-doped Co-Re-Cr alloys using transmission electron microscopy and electron energy loss spectroscopy

Titelangaben

Bölitz, Marie-Christin ; Brunner, Martin ; Völkl, Rainer ; Mukherji, Debashis ; Rösler, Joachim ; Glatzel, Uwe:
Microstructural and analytical study of boron-doped Co-Re-Cr alloys using transmission electron microscopy and electron energy loss spectroscopy.
In: International Journal of Materials Research. Bd. 103 (2012) Heft 5 . - S. 554-558.
ISSN 1862-5282
DOI: https://doi.org/10.3139/146.110729

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Abstract

The development of corrosion-resistant alloys with sustained thermal and mechanical stabilities is the focus of current research on high-temperature alloys. It has been shown that the creep behavior and oxidation resistance of Co — Re alloys can be improved by small additions of, e. g., B and Zr. To understand the effect of these elements on mechanical properties, we have characterized the phases and microstructures in the Co — Re — Cr system using transmission electron microscopy. Zr forms isolated large crystals in the matrix, while B is accommodated in small intergranular (Cr,Re)2B borides. The incorporation of up to 23 at.% Re into the Cr2B structure results in increased unit cell constants. The elongated borides occur pervasively along grain boundaries, suggesting that they improve the grain boundary cohesion and thereby the mechanical properties of Co — Re — Cr alloys.