4th International Aluminium Lithium Conference
J. Phys. Colloques 48 (1987) C3-163-C3-169
DOI: 10.1051/jphyscol:1987319
THE EFFECT OF THERMOMECHANICAL PROCESSING VARIABLES ON ANISOTROPY IN MECHANICAL PROPERTIES OF Al-Li ALLOYS
K. TAKAHASHI, K. MINAKAWA et C. OUCHIAdvanced Technology Research Center, Nippon Kokan K.K. 1-1 Minamiwatarida, Kawasaki-ku, Kawasaki, 210, Japan
Abstract
The effect of thermochanical processing on microstructure and mechanical properties of Al-Li-Cu-Zr alloy was studied. Particular attention was given to anisotropy in mechanical properties. It is found that the low slab reheating temperature (400°C) with the low finish-rolling temperature (300°C) resulted in the highest strength as well as the best strength-ductility balance. It is also found that anisotropy in mechanical properties is considerably improved in the plate reheated at low temperature (400°C) with the low finish-rolling temperature (300°C). The same hot working condition improves exfoliation resistance of the alloy. The obtained results are discussed in terms of grain morphology, grain boundary precipitation, grain size and recrystallized structure.