TERNARY PHASE EQUILIBRIA IN TRANSITION METAL-BORON-CARBON-SILICON SYSTEMS. PART II. TERNARY SYSTEMS. VOLUME 9. ZR-W-B SYSTEM AND THE PSEUDOBINARY SYSTEM TAB2-HFB2
AEROJET-GENERAL CORP SACRAMENTO CA MATERIALS RESEARCH LAB
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The solid state phase equilibria of the system Zr-W-B at 1400 C and the phase equilibria in the melting range for the four pseudobinary systems ZrB2-W2B5-ZrB2-WB, ZrB2-W2B and ZrB2-W have been investigated using X-ray technique, melting point determinations and metallographic examinations. At 1400 C, the intermetallic phase ZrW2 and the four tungsten-boron intermediate phases were found to be in equilibrium with ZrB2. Two ternary phases, one possibly stable only at high temperatures, were indicated to exist in this system. The pseudobinary system, TaB2-HfB2 forms a series of continuous solid solutions. The melting points increase smoothly from pure TaB2 to HfB2.
- Properties of Metals and Alloys