Contact formation during the electric-pulse sintering of a titanium alloy powder

Vityaz, P. A.; Kaptsevich, V. M.; Belyavin, K. E.; Prezhina, T. E.; Керженцева, Л. Ф.; Govorov, V. G.

doi:10.1007/bf00796064

Cited by 9 publications

(5 citation statements)

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“…Because of the complex nature of various phenomena involved in SPS, only a relatively moderate number of modeling attempts have been undertaken until presently 1–56 . One of the most important questions: which factors provide accelerated densification and, in many cases, limited grain growth under SPS compared with regular hot pressing applied to the same material systems, still remains unanswered.…”

Section: Introductionmentioning

confidence: 99%

Impact of Thermal Diffusion on Densification During SPS

Olevsky

Froyen

2009

Journal of the American Ceramic Society

204

103

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Spark-plasma sintering (SPS) has the potential for rapid (with heating rates reaching several hundred K/min) and efficient consolidation of a broad spectrum of powder materials. Possible mechanisms of the enhancement of consolidation in SPS versus conventional techniques of powder processing are categorized with respect to their thermal and athermal nature. This paper analyzes the influence of thermal diffusion, which is an SPS consolidation enhancement factor of a thermal nature. The Ludwig-Soret effect of thermal diffusion causes concentration gradients in two-component systems subjected to a temperature gradient. The thermal diffusion-based constitutive mechanism of sintering results from the additional driving force instigated by spatial temperature gradients, which cause vacancy diffusion. This mechanism is a commonly omitted addition to the freesurface curvature-driven diffusion considered in conventional sintering theories. The interplay of three mechanisms of material transport during SPS is considered: surface tension-and external stress-driven grain-boundary diffusion, surface tensionand external stress-driven power-law creep, and temperature gradient-driven thermal diffusion. It is shown that the effect of thermal diffusion can be significant for ceramic powder systems. Besides SPS, the results obtained are applicable to the ample range of powder consolidation techniques, which involve high local temperature gradients.The case study conducted on the alumina powder SPS demonstrates the correlation between the modeling and experimental data. It is noted that this study considers only one of many possible mechanisms of the consolidation enhancement during SPS. Further efforts on the modeling of field-assisted powder processing are necessary.

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Section: Introductionmentioning

confidence: 99%

Impact of Thermal Diffusion on Densification During SPS

Olevsky

Froyen

2009

Journal of the American Ceramic Society

204

103

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“…Scientists from Belarus State Research and Production Powder Metallurgy Association, Minsk used a pilot-production facility to conduct high-voltage electric pulse sintering [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ].…”

Section: Methods Of Electric Current-assisted Consolidation Of Powmentioning

confidence: 99%

“…This ratio has to be retained during several cycles of electric pulse sintering. When titanium powder of VT-9 grade produced by atomization of cast electrodes is sintered, the dendrite structure is preserved, in which the content of the b-phase is higher in larger dendrites than in smaller ones [ 34 , 36 , 43 ]. This indicates that diffusion processes do not have sufficient time to occur due to rapid heat conduction into the sample volume.…”

Section: Materials Processed By Electric Current-assisted Consolidmentioning

confidence: 99%

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Outside Mainstream Electronic Databases: Review of Studies Conducted in the USSR and Post-Soviet Countries on Electric Current-Assisted Consolidation of Powder Materials

et al. 2013

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This paper reviews research articles published in the former USSR and post-soviet countries on the consolidation of powder materials using electric current that passes through the powder sample and/or a conductive die-punch set-up. Having been published in Russian, many of the reviewed papers are not included in the mainstream electronic databases of the scientific articles and thus are not known to the scientific community. The present review is aimed at filling this information gap. In the paper, the electric current-assisted sintering techniques based on high- and low-voltage approaches are presented. The main results of the theoretical modeling of the processes of electromagnetic field-assisted consolidation of powder materials are discussed. Sintering experiments and related equipment are described and the major experimental results are analyzed. Sintering conditions required to achieve the desired properties of the sintered materials are provided for selected material systems. Tooling materials used in the electric current-assisted consolidation set-ups are also described.

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“…The importance of this issue becomes even clearer by noticing that in all the different names that have been considered for this method such as field-assisted Handling Editor: P. Nash. sintering technology (FAST) [11], electric spark plasma sintering (ESPS) [12], electric pulse sintering (EPS) [13], electric current-assisted sintering (ECAS) [14], pulsed electric current sintering (PECS) [15,16], and electric discharge sintering (EDS) [17,18], the emphasis has been on the use of the electric current in the process.…”

Section: Introductionmentioning

confidence: 99%

A critical review on spark plasma sintering of copper and its alloys

et al. 2021

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Copper and its alloys have been in the service of humankind earlier than any other metal throughout history. In the present review, all aspects of the SPS of copper and its alloys are comprehensively investigated, and their potential effects on the microstructure and properties of alloys are thoroughly reviewed. In this regard, the densification phenomenon during SPS treatment is fully investigated. The effects of raw powder characteristics involving particle size, contamination content, and powder morphology on the sinterability of these materials are examined. Then, the influence of SPS operation parameters consisting of pressure, heating rate, dwelling time, pulsed electrical current, electrical pulses pattern, sintering temperature, and sintering tooling on densification of these materials is extensively discussed. Furthermore, the microstructure evolution and grain growth behaviors during SPS are explored. In addition, current challenges and future perspectives of this field are addressed.

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Contact formation during the electric-pulse sintering of a titanium alloy powder

Cited by 9 publications

References 0 publications

Impact of Thermal Diffusion on Densification During SPS

Impact of Thermal Diffusion on Densification During SPS

Outside Mainstream Electronic Databases: Review of Studies Conducted in the USSR and Post-Soviet Countries on Electric Current-Assisted Consolidation of Powder Materials

A critical review on spark plasma sintering of copper and its alloys

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