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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 1    February 2004

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Microstructure and properties of Al-4Cu alloy containing Sc
XU Guo-fu(徐国富)1,2, NIE Zuo-ren(聂祚仁)1, JIN Tou-nan(金头男)1,
RONG Li(荣 莉)1, RUAN Hai-qiong(阮海琼)1, YIN Zhi-min(尹志民)2

1. School of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract:The effects of different contents of Sc addition on the microstructures and properties of the Al-4%Cu alloy were studied by tensile properties measurement, optical microscope, X-ray diffraction analysis, scanning electron microscope (SEM) and energy spectrum analysis. The experimental results show that rare-earth element Sc is capable of refining the dendritic structure of the Al-4%Cu alloy, the tensile strengthσband yield strengthσ0.2just increase a little when the content of Sc is lower than 0.2%; when the content reaches 0.3% 0.4%,σbandσ0.2slightly decrease; butσband σ0.2rise again when the Sc content is 0.5%, though both of them are lower than those of the Al-4%Cu alloy without Sc addition. However, Sc addition has little influence on the elongation of the Al-4%Cu alloy. Adding Sc to the Al-4%Cu alloy, when the amount of Sc is lower than 0.2%, Sc mostly exists in theα(Al) solid solution; when the Sc content is in the range of 0.3% 0.5%, only a part of Sc exists in theα-Al solid solution, the rest appears in two ways: one is that Sc and Al form Al3Sc which can strengthen the alloy, and the other, Sc interacts with Al and Cu to form AlCuSc phase.

 

Key words: Sc; Al-Cu alloy; microstructure; mechanical properties

ISSN 1672-7029
CN 43-1423/U

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