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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Microstructure evolution in nanocrystalline Cu-Nb alloy during
mechanical alloying
LEI Ruo-shan(雷若姗),WANG Ming-pu(汪明朴),GUO Ming-xing(郭明星),                      &

School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract:The microstructural evolution of nanocrystalline Cu-10%Nb(mass fraction) alloy during mechanical alloying (MA) was investigated by using X-ray diffraction, optical microscopy(OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observation. Upon milling of Cu-Nb powders with coarse grains, the grain size is found to decrease gradually with lengthening milling time, and reach the minimum value (about 9 nm) after 100 h milling. The microstrain and the microhardness of the powders increase during the grain refinement. And Cu lattice parameter increases steadily over 100 h milling. The mechanisms of solid solution extension during milling were discussed. The results show that up to 10%Nb can be brought into solid solution by MA. The extension of solid solution is found to relate closely with the formation of nanocrystalline

 

Key words: mechanical alloying; nanocrystalline material; Cu-Nb alloy; microstructure

ISSN 1672-7029
CN 43-1423/U

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