Tensile Behavior of Superplastic Al-Cu-Li-Zr Alloy 2090 at Cryogenic Temperatures

摘要

The tensile behavior of superplastic Al-Cu-Li-Zr alloy 2090 sheet at cryogenic temperatures is investigated in both superplastically formed and unformed material. In both cases, the tensile properties improve significantly at low temperatures. The improvement in uniform elongation between room temperature and 4 sup 0 K is especially large. As in other 2090 material with different microstructures, this improvement seems to be associated with increased strain hardening rates at low temperatures. A transition in tensile failure model with decreasing temperature is also observed. 8 refs., 5 figs., 1 tab. (ERA citation 12:047826)