Abstract
The objective of this study was to determine if particle strengthening by a HfC precipitate could be obtained in a ductile W-high Re alloy. A W-23.4Re-0.27Hf-C alloy was consolidated by arc melting, fabricated to sheet and rod, and evaluated by tensile, creep, and bend testing. The carbon content of test specimens ranged from 0.12 to 1.12 at.%. The alloy was found to exhibit good high temperature strength properties. For example, at 3000 °F (1649 °C), the HfC-strengthened alloy had a short-time tensile strength of 62.7 ksi (432 MN/m 2), more than double the strength of 28.1 ksi (194 MN/m 2) observed earlier for W-24Re. The strength advantage decreases at higher temperatures due to rapid HfC particle coarsening and grain boundary sliding. The alloy exhibited good tensile and bend ductility at room temperature. It is concluded that the W-high Re alloy with a fine HfC precipitate has an attractive combination of low temperature ductility and high strength to temperatures of about 3000 °F (1649 °C).
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