Method of heat treatment of AL-based alloys containing Li and th

Details Method of heat treatment of AL-based alloys containing Li and th Method of heat treatment of AL-based alloys containing Li and th

1988-10-20

1990-01-30

Dean, R.

Metal treatment

Compositions

Heat treating

148159, 148415, 148416, 148417, C22F 104

Patent

active

048971251

ABSTRACT:
The invention concerns a method for final heat treatment tempering at Al alloys containing Li and at least one other major element selected from the group Cu, Mg and Zn, as well as possible minor elements such as Zr, Mn, Cr, Ni, Hf, Ti and Be, in addition to inevitable impurities such as Fe and Si. The treatment involves a principal tempering operation which takes place at a time and temperature in an area defined by a parallelogram on a temperature log-time diagram, whose corners have the following coordinates: (A) 270.degree. C.--3 min; (B) 270.degree. C.--48 min; (C) 225.degree. C.--9 hrs 30 min; (D) 225.degree. C.--35 min. The heat treatment makes it possible to produce a satisfactory array of mechanical characteristics such as mechanical strength, ductility, or toughness and resistance to corrosion, which are higher than those achieved by means of conventional treatments of type T6 or by under-ageing operations.

REFERENCES:
patent: 4812178 (1989-03-01), Dubost

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