J. Phys. Colloques
Volume 48, Numéro C3, Septembre 19874th International Aluminium Lithium Conference
|Page(s)||C3-117 - C3-122|
J. Phys. Colloques 48 (1987) C3-117-C3-122
CASTABILITY OF Al-Li-Mg AND Al-Li-Cu-Mg ALLOYSC.H. TONG, L.G. YAO, C.Y. NIEH, C.P. CHANG et S.E. HSU
Chung shan Institute of Science and Technology, P.O. Box 1-26-4, Lung-Tan, Taiwan 32500, Republic of China
The objective of the present work is to study the casting characteristics of various Al-Li alloys, which include fluidity and strengths of the alloys and their interaction with cast molds. Materials investigated are Al-Li-Mg and Al-Li-Cu-Mg alloys with Li content of 2.5 wt%. The results show that sand molds with resin binders are good for Al-Li casting. Ceramic coatings can further reduce the metal-mold interactions. However, the permeability is also reduced by coating. The fluidity of Li-bearing aluminum alloys is inferior to that of A356. Compared with copper, magnesium gives a better combination of fluidity and strength to Al-Li alloys. Al-Li-Cu, together with Al-Li-Mg, are capable of providing a wide range of strength-ductility combination to casting designs. Al-Li-Mg sand cast also possesses around 80% of the strength of its wrought counterpart.