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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