Per the Aluminum Association:
Typical Average Modulus of Elasticity: 10,600,000 psi
Note: the Compressive Modulus is typically about 2% greater than the Tension Modulus.
Note: the Aluminu Association draws a distinction between "Minimum" and "Typical" properties. Typicals tend to be about 15% higher than Minimums. Use Minimums for design. Then again, I think this just refers to strengths, not modulii. Oh well...
Per "Aluminum Structures" by Kissel and Ferry:
Poisson's ration: 0.33