Equation of State of Shock-Loaded Tungsten at 950°C

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Abstract
The Hugoniot of wrought tungsten which was 99.6% of the crystalline density and 99.92% pure has been determined to 80 kbar at room temperature and at 950°C. Measurements of the stress‐particle velocity relationship were made by impacting a sapphire‐faced quartz gauge assembly onto the tungsten sample. In the room temperature experiments, transmitted wave profiles were determined with quartz gauges. At room temperature, the elastic wave velocity was 5.22±0.05 mm/μsec and the Hugoniot elastic limit for 9.5 mm thick specimens was 37.7±0.8 kbar. The stress‐particle velocity Hugoniot at 950°C, while nearly parallel to the room temperature Hugoniot, was displaced about 15 kbar downward due to a decrease in the Hugoniot elastic limit at this temperature. This decrease is associated with a temperature induced brittle‐ductile transition. The application of these data in calculating the Grüneisen parameter is discussed.