Abstract
Tungsten dispersed by hafnium carbide (HfC) particles has been found to be the strongest metallic material at temperatures above 2000 K. The strength of W-HfC alloy is directly related to the thermostability of HfC particles at ultrahigh temperatures. In the present study, the growth behavior and growth mechanism of HfC particles from 2200 to 3000 K are examined with transmission electron microscopy (TEM) and a correlation between the particle size and alloy strength is established.The examined material was a tungsten-3.6 wt%rhenium-0.35 wt%HfC alloy. The solid solution element rhenium was to improve the fabricability of tungsten at room temperature. Specimens were heated to a temperature between 2200 and 3000 K for two hours and then deformed in tension. After a 5% elongation, the specimens were rapidly cooled down to room temperature at a cooling rate greater than 200 K/s in order to maintain the high temperature substructures which were examined with a JEM-2000FX high resolution TEM.
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