Non-isothermal crystallization behavior of Al86Ni8Y6 and Al86Ni6Y4.5Co2La1.5 melt-spun ribbons, milled ribbon particles and bulk samples consolidated by spark plasma sintering

2020 ◽  
Vol 684 ◽  
pp. 178486
Author(s):  
Ashutosh Sahu ◽  
Ram Sajeevan Maurya ◽  
Tapas Laha
Keyword(s):  
Spark Plasma Sintering ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Plasma Sintering ◽  
Melt Spun ◽  
Spark Plasma ◽  
Melt Spun Ribbons

Influence of Temperature During Spark Plasma Sintering Compaction of Melt-Spun p-Bi0.5Sb1.5Te3

2014 ◽  
Vol 44 (6) ◽  
pp. 1517-1523 ◽  
Author(s):  
A. A. Melnikov ◽  
N. Yu. Tabachkova ◽  
S. A. Kichik ◽  
I. S. Marakushev ◽  
A. N. Koryakin ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Influence Of Temperature ◽  
Plasma Sintering ◽  
Melt Spun ◽  
Spark Plasma

NdFeB/αFe Nanocomposite Permanent Magnets with Enhanced Properties Prepared by Spark Plasma Sintering

2011 ◽  
Vol 672 ◽  
pp. 229-232
Author(s):  
Marian Grigoraş ◽  
M. Lostun ◽  
Nicoleta Lupu ◽  
Horia Chiriac
Keyword(s):  
Spark Plasma Sintering ◽  
Permanent Magnets ◽  
High Energy ◽  
Maximum Energy ◽  
Maximum Energy Product ◽  
Energy Product ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Energy Ball ◽  
Melt Spun Ribbons

Nanocomposite NdFeB/αFe magnets were obtained by spark plasma sintering technique using high energy ball-milled Nd-Fe-B melt-spun ribbons mixed in different weight ratios with Fe commercial powders. The remanence of SPS nanocomposite magnets increases with the Fe powders content from 6.1 for 4 wt.% Fe to 6.4 kG for 5 wt.% Fe, while the estimated maximum energy product is also increased from 9.0 to 10.6 MGOe.

Processing and Properties of Ni-Based Bulk Metallic Glass via Spark Plasma Sintering of Pulverized Amorphous Ribbons

MRS Advances ◽  
2017 ◽  
Vol 2 (61) ◽  
pp. 3815-3820 ◽  
Author(s):  
Alexander. S. Petersen ◽  
Andrew. M. Cheung ◽  
Henry. J. Neilson ◽  
S. Joseph. Poon ◽  
Gary. J. Shiflet ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Metallic Glasses ◽  
Large Scale ◽  
High Hardness ◽  
Load Pressure ◽  
Amorphous Ribbons ◽  
Plasma Sintering ◽  
Melt Spun ◽  
Spark Plasma ◽  
Selection Of

ABSTRACTNi-based bulk metallic glasses and composites with high absolute densities exceeding 11 g/cm3 were synthesized via spark plasma sintering of Ni45Co10Ta25Nb20 powders produced from pulverized, melt-spun amorphous ribbons. Optimizing the synthesis via selection of sintering temperature, uniaxial load pressure, and powder mechanical screening yielded samples with relative densities of nearly 100% and hardness values in excess of 12.5 GPa without cracking. Mechanical testing included Weibull modulus determination for hardness and compression testing at 10-3 s-1 and 103 s-1 strain rates. The capability of using spark plasma sintering to fabricate high hardness, high density, large scale metallic glasses is demonstrated. The mechanical properties of these compacted comminuted melt-spun glass ribbons are presented.

MICROSTRUCTURE AND THERMOELECTRIC PROPERTIES OF (Zr,Hf)NiSn-BASED HALF-HEUSLER ALLOYS BY MELT SPINNING AND SPARK PLASMA SINTERING

2010 ◽  
Vol 03 (04) ◽  
pp. 227-231 ◽  
Author(s):  
CUI YU ◽  
TIEJUN ZHU ◽  
KAI XIAO ◽  
JUNJIE SHEN ◽  
XINBING ZHAO
Keyword(s):  
Thermal Conductivity ◽  
Spark Plasma Sintering ◽  
Melt Spinning ◽  
Lattice Thermal Conductivity ◽  
Heusler Alloys ◽  
Grain Sizes ◽  
Plasma Sintering ◽  
Melt Spun ◽  
The Matrix ◽  
Spark Plasma

(Zr,Hf)NiSn -based half-Heusler thermoelectric materials have been prepared by melt spinning and spark plasma sintering to refine the grain size. The grain sizes of the melt-spun thin ribbons varied from ~500 nm to ~3 μm and no significant grain growth were found for the bulk samples compacted by spark plasma sintering. Nanoscale precipitates dispersed in the matrix were observed, which should be more metallic due to the increase of the electrical conductivity. The reduction of lattice thermal conductivity was observed due to the refined grain sizes.

Isotropic and Anisotropic Nanocrystalline NdFeB-Based Magnets Prepared by Spark Plasma Sintering and Hot Deformation

2012 ◽  
Vol 510-511 ◽  
pp. 307-314 ◽  
Author(s):  
Zhong Wu Liu ◽  
Y.L. Huang ◽  
H.Y. Huang ◽  
X.C. Zhong ◽  
Hong Ya Yu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Grain Growth ◽  
Spark Plasma Sintering ◽  
Hot Deformation ◽  
Grain Structure ◽  
Coarse Grain ◽  
Fine Grain ◽  
Plasma Sintering ◽  
Melt Spun ◽  
Spark Plasma

Isotropic and anisotropic NdFeB permanent magnets were prepared by Spark Plasma Sintering (SPS) and SPS followed hot deformation (HD), respectively, using melt spun NdFeB ribbons with various compositions as starting materials. It is found that, based on RE-rich composition, SPSed magnets sintered at low temperatures (<700 C) almost maintained the uniform fine grain structure inherited from rapid quenching. At higher temperatures, a distinct two-zone (coarse grain and fine grain zones) structure was formed in the SPSed magnets. The SPS temperature and pressure have important effects on the grain structure, which led to the variations in the magnetic properties. By employing low SPS temperature and high pressure, high-density magnets with negligible coarse grain zone and an excellent combination of magnetic properties can be obtained. For single phase NdFeB alloy, because of the deficiency of Nd-rich phases, it is relatively difficult to consolidate micro-sized melt spun powders into high density bulk magnet, but generally a larger particle size is beneficial to achieve better magnetic properties. Anisotropic magnets with a maximum energy product of ~38 MGOe were produced by the SPS+HD process. HD did not lead to obvious grain growth and the two-zone structure still existed in the hot deformed magnets. The results indicated that nanocrystalline NdFeB magnets without significant grain growth and with excellent properties could be obtained by SPS and HD processes.

Fabrication and Mechanical Properties of ultra fine WC-6wt.%Co by Spark Plasma Sintering Process

2011 ◽  
Vol 49 (01) ◽  
pp. 40-45 ◽  
Author(s):  
Hyun-Kuk Park ◽  
Seung-Min Lee ◽  
Hee-Jun Youn ◽  
Ki-Sang Bang ◽  
Ik-Hyun Oh
Keyword(s):  
Mechanical Properties ◽  
Spark Plasma Sintering ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Spark Plasma
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