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Spark plasma sintering and mechanical properties of zirconium micro-alloyed tungsten

Author:
Z.M. Xie  R. Liu  Q.F. Fang  Y. Zhou  X.P. Wang  C.S. Liu  


Journal:
Journal of Nuclear Materials


Issue Date:
2014


Abstract(summary):

Abstract Dense pure tungsten and W–(0.1, 0.2, 0.5, 1.0) wt% Zr alloys were fabricated through spark plasma sintering method. The relative density of all the samples was about 97%. The FESEM and TEM analysis, tensile tests and Vickers micro-hardness measurements were exploited to characterize these samples. It is found that Zr could capture impurity oxygen in tungsten and form nanometer scaled ZrO 2 particles. With the increase of Zr addition from 0 to 0.2 wt%, the room-temperature fracture strength increased from 154 MPa to 265 MPa, and the fracture energy density elevated from 3.73 × 10 4 J/m 3 to 9.22 × 10 4 J/m 3 . However, more Zr addition would increase the size of Zr–O particles and significantly decrease the fracture strength and toughness of tungsten.


Page:
175-175


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