Microstructure and properties of Al-4Cu alloy containing Sc

来源期刊：中国有色金属学报(英文版)2004年第1期

论文作者：徐国富 聂祚仁 金头男 荣莉 阮海琼 尹志民

文章页码：63 - 66

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

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.

基金信息：the National Key Fundamental Research and Development Program of China