The effect of void size on the resistivity of sintered tungsten

Uray, L.

doi:10.1002/pssa.2210820227

Phys. Stat. Sol. (a)

1984

DOI: 10.1002/pssa.2210820227

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The effect of void size on the resistivity of sintered tungsten

L. Uray

Abstract: Electrical resistivity is measured from 4.2 to 300 K on sintered tungsten to determine the resistivity contribution of random electron scattering on voids. The resistivity contribution is obtained in two steps: at first the excess resistivity is determined from the resistivity ratio, which is unsensitive to the current flow around voids. In the second step the excess resistivity is separated into contributions due to solutes and void scattering. The effect of solutes is taken into account by measuring also the… Show more

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Cited by 2 publications

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The segregation of iron in tungsten

Uray

Menyhárd

1984

Phys. Stat. Sol. (a)

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Segregation and solution of iron is followed up on a commercial WFe dilute alloy by measuring electrical resistivity, thermopower and — on the fracture surface — AES. The thermopower measures practically only the solute iron concentration in this alloy. At the same time the excess electrical resistivity is sensitive mostly to the concentration of grain boundaries and the AES measures the iron accumulated on the surface of the grain boundaries. According to these measurements grain boundary segregation occurs at temperatures where the bulk diffusion is negligible yet. So this segregation can be explained only by moving grain boundaries, which “sweep over” the crystallites, accumulating the iron atoms. It turned out that only a part of the iron segregated onto the grain boundaries, the larger part segregated onto the second phases, although their total surface is about ten times less. Supposing a state close to the equilibrium, the heats of segregation is estimated to be 50 and 100 to 120 kJ/mol for segregation to grain boundaries and to second phases, respectively.

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The segregation of iron in tungsten

Uray

Menyhárd

1984

Phys. Stat. Sol. (a)

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Splitting and Lüders Band Formation During Torsion in Lamp Grade Tungsten

Uray¹

1997

High Temperature Materials and Processes

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Torsion testing permits the separation of stress relieved commercial non-sag tungsten wires into three classes of split propensity. The most ductile sorts of wire deform split-free in free-end torsion in a nearly homogeneous way up to quite large strains and undergo considerable elongation. Wires rejected by the split test form Lüders bands at low twist angles. In these wires the formation and propagation of Lüders bands are connected with splitting and considerable shortening. There is also an intermediate sort of wires. These pass the split test but form Lüders bands at low twist angles. These Lüders bands propagate with a very small change in sample length.The strain distribution along the wire was measured by means of a marker line, and the splits were revealed by scanning electron microscopy. The resistivity contribution of the splits and the lattice defects were separated by measuring the effective resistivity and the resistance ratio at 77 and 300 Κ of the samples.The origin of the three classes of split propensity is discussed with respect to the nature of the Lüders bands and to the possible effect of the drawing temperature.

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The effect of void size on the resistivity of sintered tungsten

Cited by 2 publications

References 6 publications

The segregation of iron in tungsten

The segregation of iron in tungsten

Splitting and Lüders Band Formation During Torsion in Lamp Grade Tungsten

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