Creep densification of copper powder compact

Song, Mou Sheng; Kim, H.G.; Kim, K.T.

doi:10.1016/0020-7403(96)00011-2

Cited by 14 publications

(1 citation statement)

References 7 publications

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“…At present, most of the researches [6][7][8][9][10][11][12] at home and abroad focus on establishing the densification model of the powder during hot isostatic pressing; however, the reports about the flow stress, densification behaviours and microstructures of the porous samples under the thermal compression are very deficient. Thus, this study carried out some hot uniaxial compressions at elevated temperatures on the samples which had been hot isostatically pressed to 70%-100% relative densities to investigate the deformation behaviours of porous Ti-6Al-4V alloy Experimental Hot isostatic pressing.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior of Porous Ti-6Al-4V Alloy Samples Fabricated by Hot Isostatic Pressing

Xue

Lang

et al. 2011

AMR

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In the present paper, hot uniaxial compression at elevated temperatures on the samples which had been hot isostatically pressed to 70%-100% relative densities was carried out to investigate the deformation behaviours of porous Ti-6Al-4V alloy. The results show that the flow stress and densification of Ti-6Al-4V alloy have a greater sensitivity on the deformation temperature and strain rate. The flow stress will increase as strain rate increases at the same temperature and the increasing of deformation temperature can lead to a decline in the flow stress at a specific rate. As the deformation temperature rises or the strain rate decreases, the relative density of compressed samples are higher. Moreover, the initial density affects the thermal deformation of powder compact to a certain extent. At the same strain, the greater the initial relative density of Ti-6Al-4V alloy is, the greater the flow stress will be. The flow stress sensitivity to relative density is much less than that to the temperature and strain rate. In addition, the higher the deformation temperature is, the more sufficient the process of alloy spheroidization will be. As the deformation rate decrease, the lamellar organization in the titanium alloy will convert into the equiaxed grains. The lower the deformation rate is, the more obvious the phenomenon of alloy globalization will be. There is not significant transition of the widmanstatten structure in the sample compressed for 2mm. When the sample was compressed for 5.6mm, a few equiaxed grains occurred. When the sample was compressed for 7mm, a large number of equiaxed grain occurred.

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Section: Introductionmentioning

confidence: 99%

Deformation Behavior of Porous Ti-6Al-4V Alloy Samples Fabricated by Hot Isostatic Pressing

Xue

Lang

et al. 2011

AMR

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Fundamental aspects of hot isostatic pressing: An overview

Atkinson

Davies

2000

Metall Mater Trans A

613

268

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Hot isostatic pressing (hipping) can be used for upgrading castings, densifying presintered components, consolidating powders, and interfacial bonding. It involves the simultaneous application of a high pressure and elevated temperature in a specially constructed vessel. The pressure is applied with a gas (usually inert) and, so, is isostatic. Under these conditions of heat and pressure, internal pores or defects within a solid body collapse and diffusion bond. Encapsulated powder and sintered components alike are densified to give improved mechanical properties and a reduction in the scatter band of properties.In this article, the basic science of sintering and hipping is summarized and contrasted. The current state of understanding and modeling of hipping is then reviewed. Models can be classified either as microscopic or macroscopic in their approach. In the microscopic approach, the various mechanisms of densification are analyzed in terms of a single particle and its surroundings. In the macroscopic approach, the compact is treated as a continuous medium. In hipping, although the pressure is isostatic, shrinkage is not generally isotropic, particularly if containment is used. However, the shrinkage can now be well predicted, provided that the material and container properties are accurately known.

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