A commercial Al-4.1%Mg-2.0%Li-0.16%Sc-0.07%Zr alloy was used as a starting material. The submicrocrystalline structure with an average grain size of about 0.8 mum was developed by equal-channel angular extrusion. Superplastic behavior of this alloy was examined in the temperature range 150-250degreesC at strain rates ranging from 1.4 x 10(-5) to 5.6 x 10(-2) s(-1). A maximum elongation-to-failure of 440% was recorded at 175degreesC (0.5T(m), where T-m is the melting point) and a strain rate of 2.8 x 10(-5) s(-1). The strain rate sensitivity was measured as similar to0.32 at these conditions. This temperature is exceptionally low for superplasticity in Al-based alloys, as it has been reported to date. Features of superplastic deformation at such the low temperature are considered.