Plastic deformation and fracture of niobium reinforced with tungsten fibers
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An investigation into the temperature dependence of the strength of a niobium/tungsten-wire composite, which constitutes a typical ductile-matrix/ductile-fiber system, has shown that at high temperature (> 1000°C) there is a discrepancy between the experimentally determined strength of the composite and values of strength calculated with the additive equation.
The extra strength of the composite is due to a “plasticizing” influence exerted by the niobium matrix on the tungsten fibers, as a result of which the latter undergo additional strain strengthening.
Fractographic examinations revealed that the rupture of a Nb/W composite is preceded by substantial local plastic deformation of its components.
KeywordsTungsten Plastic Deformation Niobium Local Plastic Additive Equation
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