Rarefaction velocities in shocked tantalum and the high-pressure melting point

Technical Report · Fri Dec 31 23:00:00 EST 1982

DOI:https://doi.org/10.2172/5962493· OSTI ID:5962493

Brown, J M; Shaner, J W

The optical analyzer technique has been used to determine the pressure at which shock compressed tantalum can no longer support a longitudinal elastic wave. At 295 GPa, the release wave velocity drops to a value consistent with a calculated bulk sound velocity, indicating partial melting. At higher shock pressures, the bulk sound velocity follows a constant rho ..gamma.. model, where ..gamma.. is the Grueneisen parameter. With these measurements we have identified melting on the Ta Hugonitot, and we have calibrated Ta as a high impedance driver for similar experiments on other materials.

• Research Organization: Texas A and M Univ., College Station (USA); Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5962493
• Report Number(s): LA-UR-83-2144; CONF-830719-17; ON: DE83015916
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
COMPRESSION
DATA
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
MEASURING METHODS
MELTING
MELTING POINTS
METALS
NUMERICAL DATA
PHASE TRANSFORMATIONS
PHOTOMETRY
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
SHOCK WAVES
SOUND WAVES
TANTALUM
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
VELOCITY
WAVE PROPAGATION