EFFECT OF THERMOMECHANICAL TREATMENT ON TOUGHENING OF Al-Li-Cu-Mg-Zr ALLOY AND ITS TOUGHNESS M. NIINOMI, K. DEGAWA et T. KOBAYASHI J. Phys. Colloques, 48 C3 (1987) C3-653-C3-659 DOI: 10.1051/jphyscol:1987375