Abstract
The tensile properties and fracture characteristics of two kinds of Ag-containing Al-Li-Cu-Mg-Zr alloys with different aging conditions have been studied from 290 to 77 K. The results show that the tensile strength and ductility of the alloys improved significantly with a decrease in test temperature from 153 to 77 K, except for the elongation of some alloys in certain aging conditions. Planar slip behavior is the predominant deformation mode for the natural-, under-, and peak-aged samples when tested at room temperature, but the slip distribution is fairly homogeneous as the test temperature is reduced to 77 K. The different modes of tensile fracture are closely associated with the aging time and test temperatures. The improvement in cryogenic ductility of the alloys can be attributed to an increase in deformation homogeneity. The tensile fracture behavior of the alloys at ambient and cryogenic temperatures are discussed.
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