Numéro
J. Phys. Colloques
Volume 48, Numéro C3, Septembre 1987
4th International Aluminium Lithium Conference
Page(s) C3-653 - C3-659
DOI https://doi.org/10.1051/jphyscol:1987375
4th International Aluminium Lithium Conference

J. Phys. Colloques 48 (1987) C3-653-C3-659

DOI: 10.1051/jphyscol:1987375

EFFECT OF THERMOMECHANICAL TREATMENT ON TOUGHENING OF Al-Li-Cu-Mg-Zr ALLOY AND ITS TOUGHNESS

M. NIINOMI, K. DEGAWA et T. KOBAYASHI

Department of Production Systems Engineering, Toyohashi University of Technology, 1-1, Hibarigaoka, Tempaku-cho, Toyohashi 440, Japan


Abstract
The effect of the thermomechanical treatment for toughening the Al-Li-Cu-Mg-Zr alloy was investigated using the computer aided instrumented Charpy impact testing (CAI) system. In addition, the temperature dependence of the toughness of this alloy was also investigated. The intermediate thermomechanical treatment originally developed by Rockwell International Co. (RI-ITMT) was proved to be effective in increasing the toughness of this alloy. The toughness of this alloy increased with the decrease of the temperature below room temperature. The toughness near room temperature appeared to be affected by low melting point metals like Na and K.