AL AS A SIMPLE SOLID - HIGH-PRESSURE STUDY TO 220-GPA (2.2-MBAR)

The static equation of state of Al has been measured to 220 GPa, corresponding to a compression of V/V-0 = 0.50. No phase transformation from the fee to hcp phase was observed. The equation of state fits the H11 form for a simple solid as defined by W. B. Holzapfel [Phys. Rev. B 48, 767 (1993)] with no free parameters. These results are also consistent with recent shock data on Al to a pressure of 1 TPa (V/V-0 = 0.30) [Phys. Rev, Lett. 60, 1414 (1988)]. The ultrasonic, static, and shock equations of state of Al are reconciled and compared to theoretical predictions.