A FAST winner for fully dense nano powders

Kandukuri, Sastry

doi:10.1016/s0026-0657(08)70161-9

Cited by 10 publications

(3 citation statements)

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“…Pulsed DC flows through the die and powder compact producing heat via Joule heating mechanism, providing a much higher heating rate and shorter sintering time compared to conventional sintering techniques. Thus, grain growth during sintering can be essentially minimized, leading to improvement in mechanical properties [18,[20][21][22]. 99.99% purity and mean particle size of 300-400 nm were all procured from the American Elements…”

Section: Introductionmentioning

confidence: 99%

Oxide dispersion strengthened nickel based alloys via spark plasma sintering

Pasebani

Dutt

Burns

et al. 2015

Materials Science and Engineering: A

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Oxide dispersion strengthened (ODS) nickel based alloys were developed via mechanical milling and spark plasma sintering (SPS) of Ni-20Cr powder with additional dispersion of 1.2 wt.% Y 2 O 3 powder. Furthermore, 5 wt.% Al 2 O 3 was added to Ni-20Cr-1.2Y 2 O 3 to provide composite strengthening in the ODS alloy. The effects of milling times, sintering temperature, and sintering dwell time were investigated on both mechanical properties and microstructural evolution. A high number of annealing twins was observed in the sintered microstructure for all the milling times.However, longer milling time contributed to improved hardness and narrower twin width in the consolidated alloys. Higher sintering temperature led to higher fraction of recrystallized grains, improved density and hardness. Adding 1.2 wt.% Y 2 O 3 to Ni-20Cr matrix significantly reduced the grain size due to dispersion strengthening effect of Y 2 O 3 particles in controlling the grain boundary mobility and recrystallization phenomena. The strengthening mechanisms at room temperature were quantified based on both experimental and analytical calculations with a good agreement. A high compression yield stress obtained at 800 °C for Ni-20Cr-1.2Y 2 O 3 -5Al 2 O 3 alloy was attributed to a combined effect of dispersion and composite strengthening.

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Section: Introductionmentioning

confidence: 99%

Oxide dispersion strengthened nickel based alloys via spark plasma sintering

Pasebani

Dutt

Burns

et al. 2015

Materials Science and Engineering: A

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“…This process is ensured to minimize damages to the tubular structures of the CNTs. The powders were placed in a stainless steel vials with different ball sizes as a means of increasing collision energy [13,14]. Intervals of 10 min and break of 10 min was utilized and ball to powder ratio was 10:1.…”

Section: Methodsmentioning

confidence: 99%

“…SPS can be used to fabricate materials at lower temperature [13], and this novel sintering technique offers great benefit such as high heating rate, short sintering time, lower sintering temperature, sintered materials are fully dense, surface activation of powder particles, material loss is reduced during sintering operation and grain growth is minimized as compared to the conventional or traditional sintering techniques that are prone to grain growth due to long sintering temperature and long holding time [12]. This study focus on the effect of heating rate on microstructures and mechanical properties on carbon nanotubes reinforced nickel aluminide.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heating Rate on the Microstructure and Mechanical Properties of Spark Plasma Sintered CNTs Reinforced Nickel Aluminide

Ayodele

Awotunde

Shongwe

et al. 2019

KEM

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Powder metallurgy method was used to consolidate nickel aluminide reinforced multi-walled carbon nanotubes through planetary ball mill in order to facilitate the effective dispersion of carbon nanotubes (CNTs). In this investigation, 0.5 wt% of CNTs was added to the powder mixture of nickel and aluminum through two ball milling processes: low energy ball mill (LEBM) and high energy ball mill (HEBM). The bulk composites were synthesized by spark plasma sintering (SPS) at constant temperature, holding time, pressure of 32 MPa, 800 °C and 5 min respectively. The heating rate was varied between 50 and 150 °C/min. Microstructural evolutions of the composites were studied and densification of the composites was improved with increase in heating rate but depreciated as the heating rate was further increased. Vickers microhardness values of the fabricated composites were enhanced with increase in heating rate.

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Spark-Plasma Sintering of W-5.6Ni-1.4Fe Heavy Alloys: Densification and Grain Growth

et al. 2012

Metall Mater Trans A

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A FAST winner for fully dense nano powders

Cited by 10 publications

References 0 publications

Oxide dispersion strengthened nickel based alloys via spark plasma sintering

Oxide dispersion strengthened nickel based alloys via spark plasma sintering

Effect of Heating Rate on the Microstructure and Mechanical Properties of Spark Plasma Sintered CNTs Reinforced Nickel Aluminide

Spark-Plasma Sintering of W-5.6Ni-1.4Fe Heavy Alloys: Densification and Grain Growth

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