Abstract
The phase stability, compressive strength, and tribology of tungsten alloy containing low activation elements, W0.5(TaTiVCr)0.5, at elevated temperature up to 1400 °C were investigated. The spark plasma sintered W0.5(TaTiVCr)0.5 alloy showed body centered cubic (BCC) structure, which was stable up to 1400 °C using in-situ high temperature XRD analysis and did not show formation of secondary phases. The W0.5(TaTiVCr)0.5 alloy showed exceptionally high compressive yield strength of 1136 ± 40 MPa, 830 ± 60 MPa and 425 ± 15 MPa at 1000 °C, 1200 °C and 1400 °C, respectively. The high temperature tribology at 400 °C showed an average coefficient of friction (COF) and low wear rate of 0.55 and 1.37 × 10−5 mm3/Nm, respectively. The superior compressive strength and wear resistance properties were attributed to the solid solution strengthening of the alloy. The low activation composition, high phase stability, superior high temperature strength, and good wear resistance at 400 °C of W0.5(TaTiVCr)0.5 suggest its potential utilization in extreme applications such as plasma facing materials, rocket nozzles and industrial tooling.
Highlights
Tungsten (W) and its alloys possess high melting point, good mechanical properties at elevated temperature, high hardness, low activation in radiation environment and low sputtering yield, which makes it a potential material for various high temperature and nuclear applications [1].W exhibits low coefficient of thermal expansion, good thermal conductivity and low vapor pressure [2,3,4]
The phase formation and microstructure of W0.5 (TaTiVCr)0.5 alloy sintered at 1600 ◦ C is shown in
We have studied the elevated temperature performance of spark plasma sintered
Summary
Tungsten (W) and its alloys possess high melting point, good mechanical properties at elevated temperature, high hardness, low activation in radiation environment and low sputtering yield, which makes it a potential material for various high temperature and nuclear applications [1].W exhibits low coefficient of thermal expansion, good thermal conductivity and low vapor pressure [2,3,4]. Tungsten (W) and its alloys possess high melting point, good mechanical properties at elevated temperature, high hardness, low activation in radiation environment and low sputtering yield, which makes it a potential material for various high temperature and nuclear applications [1]. The advantages of W are coupled with its shortcomings, such as its low fracture toughness, radiation-induced embrittlement, blistering at moderate temperatures by Deuterium (D) and Helium (He), and formation of pits, holes and bubbles by Helium at higher temperatures [5,6,7]. The reported W-based binary alloys have shown significant improvement in the mechanical properties [19,20]. Experimental analysis in different aspects of binary alloys have revealed numerous constraints as well, such as irradiation induced embrittlement in W-Re and
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