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Microstructural Evolution in Mechanically Alloyed Nb-25 at.% Ge

机译：机械合金化Nb-25 at。％Ge的微观结构演变

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The current study involves the microstructural evolution in mechanically alloyed elemental niobium and germanium powder blends. As a result of the energy imparted to the powders during processing, the ''average'' temperature of the powder reached 60 sup 0 C. With forced air cooling, the temperature was maintained at 30 sup 0 C. X-ray diffraction was used to study the phases present as a function of time as well as the average ''crystallite'' sizes from line broadening measurements. Results indicated: (1) a gradual broadening and eventual disappearance of the germanium lines; (2) a gradual broadening and decrease in 20 (increasing interplanar spacing) of the niobium lines; and (3) the development of a diffraction pattern similar to that obtained for amorphous Nb sub 3 Ge produced by vapor quenching. After 13 hours of mechanical alloying, line broadening corresponded to powders composed of approx. =1 nm diameter coherently diffracting domains. No formation of intermetallic compounds was indicated. (ERA citation 11:054129)

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