Densification of two-component materials in cold pressing

Yurchenko, A. G.; Pugina, L. I.; Shcherban, N. I.

doi:10.1007/bf00776607

Cited by 4 publications

(4 citation statements)

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“…From Eq. [13] and Eq. [22], it is also apparent that, in the case of isotropy, all components of the C ij matrix can be determined from just two sound-wave velocities, longitudinal (V 3 ) and shear (V 31 ).…”

Section: B Postcompaction Characterizationmentioning

confidence: 99%

“…[12], Eq. [13], and Eq. [22] implies certain relations that may be used to quantify the isotropy of the material, [41] namely:…”

Section: B Postcompaction Characterizationmentioning

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%

“…[5] As expected, the powder mixtures behave similarly to the matrix (Bi) powder, but require higher applied pressure to reach comparable density due to a stress shielding effect of the reinforcing phase. [8][9][10][11][12][13] An experimental configuration is used in which compaction is performed incrementally, and the data are acquired in situ (without removing the compact from the die) but at zero applied pressure. Longitudinal sound-wave velocity measurements were also performed in situ, allowing calculation of the stiffness of the compacts in the pressing direction.…”

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: B Postcompaction Characterizationmentioning

confidence: 99%

“…[12], Eq. [13], and Eq. [22] implies certain relations that may be used to quantify the isotropy of the material, [41] namely:…”

Section: B Postcompaction Characterizationmentioning

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%