Effect of Re on microstructural evolution and densification kinetics during spark plasma sintering of nanocrystalline W |
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Affiliation: | 1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India;2. Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology, Nagpur 440010, Maharashtra, India |
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Abstract: | In the present investigation, nanocrystalline W and W-xRe (x = 3, 5 wt.%) alloy powders were produced by mechanical milling/alloying using high energy ball milling. The nanocrystalline nature (~50 nm) of these powders was validated by the Rietveld refinement of their respective X-Ray diffraction patterns. Subsequently, spark plasma sintering of the ball milled powders was carried out. It was observed that pure W was not able to densify completely (relative density of 93%) at a temperature of 1500 °C. However, the addition of 5 wt.% Re resulted in near complete densification (relative density of 97%) at the same sintering temperature. The enhanced densification of W-Re powders is mainly attributed to the ductilising effect of Re assisted by the nanocrystallinity of powders, and the application of pressure during sintering. |
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Keywords: | Spark plasma sintering (SPS) Ball milling W-Re alloys X-Ray diffraction (XRD) Microstructure |
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