Application of theoretical pressing equations to the hydrostatic densification of hard-alloy mixtures

Бондаренко, В. П.; Dzhamarov, S. S.; Baidenko, A. A.

doi:10.1007/bf00790678

Cited by 2 publications

(4 citation statements)

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“…Figure 3(a) shows the longitudinal wave velocity, designated as V 3 , measured in situ along the compaction direction vs the volume fraction of porosity f p determined via Eq. [3]. The data show a monotonic increase in V 3 with decreasing f p for all compositions.…”

Section: A Compaction Behaviormentioning

confidence: 70%

“…[23,38] Treating the powder compact as a binary system consisting of porosity and an apparent matrix of the Bi and W powder and, recalling Eq. [3], Eq. [14], and Eq.…”

Section: ½12mentioning

confidence: 99%

“…[2][3][4][5]8,10,12,13,18] The difference in behavior for these systems may relate to the ductility of the matrix material (Pb, Bi, or plasticene vs Al, Fe, or Cu).…”

Section: A Compaction Behaviormentioning

confidence: 99%

“…and for estimating porosity based on the compaction conditions. The various empirical models are probably the most widely applied method for the evaluation of compaction behavior; [2][3][4][5] however, it can be difficult to directly correlate the fitting parameters with the actual physical characteristics of the materials. In addition, there exist relatively few studies comparing fitting parameters with the measured physical properties, [5,6] particularly for composite mixtures.…”

Section: Introductionmentioning

confidence: 99%

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Compaction Behavior and Mechanical Properties of Uniaxially Pressed Bi-W Composites

Martin

Hodge

Campbell

2009

Metall Mater Trans A

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Powder metallurgy is a useful route to forming particulate composite materials; however, the densification of hard and soft powder mixtures is usually inhibited by the more refractory phase. The Bi-W powder compacts were uniaxially pressed at room temperature and the compaction behavior and mechanical properties were evaluated. Pressing was performed in incremental steps from~1 to 540 MPa. After each step, the pressure was relieved and the thickness and sound-wave transit time were measured in situ (in the die), in order to determine the density and sound-wave velocity in the compact. The data show that the unreinforced Bi powder compacts to~98 pct density at 540 MPa. The W reinforcement inhibits the densification process, resulting in increased levels of residual porosity. The compaction behavior was evaluated using a modified Heckel equation, while the porosity dependence of the ultrasonically determined elastic modulus was described by a site percolation approach. Postcompaction sound-wave velocity and Vicker's hardness measurements show <5 pct anisotropy between the axial (pressing) and radial directions. The mechanical characterization illustrates the competing effects of the W reinforcement and the associated residual porosity.

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Section: A Compaction Behaviormentioning

confidence: 70%

“…[23,38] Treating the powder compact as a binary system consisting of porosity and an apparent matrix of the Bi and W powder and, recalling Eq. [3], Eq. [14], and Eq.…”

Section: ½12mentioning

confidence: 99%

“…[2][3][4][5]8,10,12,13,18] The difference in behavior for these systems may relate to the ductility of the matrix material (Pb, Bi, or plasticene vs Al, Fe, or Cu).…”

Section: A Compaction Behaviormentioning

confidence: 99%