Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 22    No. 4    April 2012

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Effect of stacking fault energy on mechanical properties of
ultrafine-grain Cu and Cu-Al alloy processed by cold-rolling
SAN Xing-yuan, LIANG Xiao-guang, CHENG Lian-ping, SHEN Li, ZHU Xin-kun

Department of Materials Science and Engineering, Kunming University of Science and Technology,
Kunming 650093, China

Abstract:Cu, Cu−2.2%Al and Cu−4.5%Al with stacking fault energies (SFE) of 78, 35 and 7 mJ/m2 respectively were processed by cold-rolling (CR) at liquid nitrogen temperature (77 K) after hot-rolling. X-ray diffraction measurements indicate that a decrease in SFE leads to a decrease in crystallite size but increase in microstrain, dislocation and twin densities of the CR processed samples. Tensile tests at room temperature indicate that as the stacking fault energy decreases, the strength and ductility increase. The results indicate that decreasing stacking fault energy is an optimum method to improve the ductility without loss of strength.


Key words: Cu; Cu alloys; cold-rolling; tensile tests; stacking fault energy

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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