Application of Aluminum in Correcting the Elastic Wave Velocity Measurement of Materials at High Pressure

A lot of wave velocity data for minerals and rocks have been obtained since the method of elastic wave velocity measurement has been established in YJ-30MN press fitted with a wedge-type cubic anvil at high pressure and high temperature. Many geological problems have been explained by using this velocity data. However, the accuracy of elastic velocity data under high pressure has not been resolved. The travel time of the upper and lower anvils is still not corrected. In this paper we calculate the relation between the velocities and pressures of aluminum according to the elastic theory and elastic constants of aluminum .Then the real travel time of the anvils is inferred from the relation between velocities and pressures. The corrected velocities for iron, which is non linear with pressure, is well consistent with other lower pressure data. Henceforward, the real travel time of the anvils can be emended according to the velocities of standard aluminum and iron before experiment. In this way the more accurate velocity data can be obtained under high pressure after corrected.