Influence of temperature on the fracture of a W-Ni-Fe alloy

A 95wt%W 3.5wt%Ni 1.5wt%Fe alloy is strained to failure in uniaxial tension at temperatures in the range −100°C to 300°C. The fracture surfaces of the tensile specimens are examined and the contributions from the fracture mechanisms: tungsten-tungsten intergranular decohesion, tungsten-binder interf...

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Bibliographic Details
Published in:Journal of materials science 2000-09, Vol.35 (17), p.4319-4324
Main Authors: O'DONNELL, R. G, WOODWARD, R. L
Format: Article
Language:English
Subjects:
Applied sciences
Crack propagation
Deformation mechanisms
Exact sciences and technology
Fracture mechanics
Fracture surfaces
Fractures
Intergranular fracture
Iron
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Nickel base alloys
Nucleation
Rupturing
Temperature
Temperature dependence
Yield strength
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Summary:A 95wt%W 3.5wt%Ni 1.5wt%Fe alloy is strained to failure in uniaxial tension at temperatures in the range −100°C to 300°C. The fracture surfaces of the tensile specimens are examined and the contributions from the fracture mechanisms: tungsten-tungsten intergranular decohesion, tungsten-binder interface decohesion, binder rupture and tungsten cleavage, are identified as a function of temperature. The observed variations are explained in terms of the flow stress temperature dependence of the two phases within the alloy. The results are consistent with a changing mode of specimen rupture from one of a localized cascade of nucleation events at low temperatures to one of crack propagation through linking of cracks within the necked region of the specimens deformed at higher temperatures.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1004840503664