Room-Temperature Tensile Behavior of <100> Oriented Tungsten Single Crystals with Rhenium in Dilute Solid Solution
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
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Tungsten single crystals oriented in the 100 direction with rhenium contents from 0 to 9 atomic percent were deformed in tension at room temperature. The addition of rhenium drastically affected the tensile behavior of these crystals was determined. Rhenium additions increased the proportional limit stress and decreased both the flow stress and the rate of work hardening. In addition, discontinuous yielding and necking during deformation were observed in crystals containing 5 atomic percent or more rhenium. Necking was not observed in unalloyed 100 oriented crystals. While deformation in the unalloyed 100 oriented crystals apparently involved both 110 and 112 slip, crystals with rhenium contents of 5 atomic percent or more deformed primarily by 112 slip. Traces attributable to 110 slip were found only in the work-hardened necked region of the 9 atomic percent rhenium crystals. The tensile behavior of these rhenium-containing crystals was similar to that of 110 oriented unalloyed tungsten crystals.
- Properties of Metals and Alloys