Electron microscopy investigations of the microstructure of a CrRe alloy.

Transmission and scanning electron microscopic investigations were carried out to characterize Cr-35Re alloy. A continuous film of precipitates at the grain boundaries and precipitates inside the grains were observed. Identification of the phases was based on the analysis of the chemical composition and the diffraction patterns. It has been found that the matrix is a solid solution of Re in Cr and sigma phase CrRe(2) was one of the phases present at the grain boundaries. In the majority of the precipitates chromium, rhenium and nitrogen were detected, which indicates the existence of a ternary compound.