Trans. Nonferrous Met. Soc. China
Vol. 13  No. 3            (Sum 54)           Jun. 2003

Phase relations of Al-4Mg-Sc-Zr quaternary system in Al-rich range at 430¡æ

XIA Chang-qing(Ïij¤Çå), ZENG Fan-hao(Ôø·²ºÆ), GU Yi(¹Å Ò»)
ª¤(School of Materials Science and Engineering,
Central South University, Changsha 410083, China)

Abstract:The 430¡æ isothermal section of the Al-4Mg-Sc-Zr quaternary system in the Al-rich range was determined by means of equilibrium alloys with the use of microstructure, X-ray diffraction analysis and electron probe microanalysis. There coexist three single-phase fields, two two-phase fields and one three-phase field. It is established that the phase Al₃Sc_1-0.5Zr_0-0.5 with L1₂ structure and Al₃Zr_1-0.8Sc_0-0.2 with DO₂₃ structure are in equilibrium with the ¦Á solid solution, Zr being dissolved in Al₃Sc, further substituting for about 50% Sc(mole fraction) whilst Sc is present in the phase Al₃Zr and the maximum substitution for Zr is about 20%.

Key words: Al-4Mg-Sc-Zr phase diagram; isothermal section;
intermetallis compound
CLC number:TG146.2ª¤
Document code: A

Foundation item: Project(G1999064907) supported by the National Key Fundamental Research and Development Program of China
Received date:2003 -02-27; Accepted date:2003-04-18
Correspondence:XIA Chang-qing, Professor; Tel: +86-731-8830267;
E-mail: xia-gro@mail.csu.edu.cn