A comparison study on microstructures and fracture behaviours of a single NbSS solid solution alloy and a two-phase NbSS/Nb5Si3 alloy prepared by spark plasma sintering and arc melting

For the first time, a powder of refractory body-centered cubic (bcc) HfTaTiNbZr-based high-entropy alloy (RHEA) was prepared by short-term (90 min) high-energy ball milling (HEBM) followed by spark plasma sintering (SPS) at 1300 °C for 10 min and the resultant bulk material was characterized by XRD and SEM/EDX. The material showed ultra-high Vickers hardness (10.7 GPa) and a density of 9.87 ± 0.18 g/cm³ (98.7%). Our alloy was found to consist of HfZrTiTaNb-based solid solution with bcc structure as a main phase, a hexagonal closest packed (hcp) Hf/Zr-based solid solution, and Me2Fe phases (Me = Hf, Zr) as minor admixtures. Principal elements of the HEA phase were uniformly distributed over the bulk of HfTaTiNbZr-based alloy. Similar alloys synthesized without milling or in the case of low-energy ball milling (LEBM, 10 h) consisted of a bcc HEA and a Hf/Zr-rich hcp solid solution; in this case, the Vickers hardness of such alloys was found to have a value of 6.4 GPa and 5.8 GPa, respectively.

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Fabrication of Lu2Ti2O7-Lu3NbO7 solid solution transparent ceramics by spark plasma sintering and their electrical conductivities

Journal of the European Ceramic Society ◽

10.1016/j.jeurceramsoc.2020.05.008 ◽

2020 ◽

Vol 40 (13) ◽

pp. 4589-4594

Author(s):

Liqiong An ◽

Linying Wang ◽

Longfei Wang ◽

Runhua Fan ◽

Akihiko Ito ◽

...

Keyword(s):

Solid Solution ◽

Spark Plasma Sintering ◽

Transparent Ceramics ◽

Plasma Sintering ◽

Electrical Conductivities ◽

Spark Plasma

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Enhanced thermionic emission properties in textured two-phase LaB6–BaB6 system prepared by spark plasma sintering

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2014.05.067 ◽

2014 ◽

Vol 611 ◽

pp. 130-134 ◽

Cited By ~ 15

Author(s):

Shen Lin Zhou ◽

Jiu Xing Zhang ◽

Li Hong Bao ◽

Xiao Guang Yu ◽

Qiang Lin Hu ◽

...

Keyword(s):

Spark Plasma Sintering ◽

Thermionic Emission ◽

Two Phase ◽

Emission Properties ◽

Plasma Sintering ◽

Spark Plasma

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TiPt HTSMA Produced by Spark Plasma Sintering of Elemental Powders

Materials Science Forum ◽

10.4028/www.scientific.net/msf.738-739.579 ◽

2013 ◽

Vol 738-739 ◽

pp. 579-583

Author(s):

Silethelwe Chikosha ◽

Hilda Kundai Chikwanda

Keyword(s):

Spark Plasma Sintering ◽

Processing Route ◽

Potential Candidate ◽

Jet Engines ◽

Two Phase ◽

Alternative Processing ◽

Plasma Sintering ◽

Spark Plasma ◽

Added Benefit ◽

Sintering Conditions

Titanium-platinum (Ti50Pt50) alloy has been identified as a potential candidate for high temperature shape memory alloy (HTSMA) applications such as actuators in jet engines. This work evaluates powder metallurgy as an alternative processing route with the added benefit that near net shaped components can be formed. Spark plasma sintering (SPS) of blended elemental titanium and platinum powders was carried out. The sintering conditions used were: temperatures ranging from 1200 to 1400 °C and sintering times ranging from 10 to 30 minutes. SEM with EDS, XRD and DSC were carried out to study the results. Results showed that SPS only achieved high density, but not homogenisation of the alloys. All sintering conditions resulted in formation of the martensitic TiPt phase of interest, together with some or all of the following phases: Ti, Ti3Pt, Ti4Pt3, Ti3Pt5 and Pt. Post sintering annealing treatments were carried out to homoginise the alloys at 1300 °C for times ranging from 5 to 15 hours. With sufficient annealing times a two phase microstructure was produced with TiPt as the majority matrix phase and Ti3Pt5 as the precipitate phase.

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Microstructures and Mechanical Properties of Consolidated Mg-Zn-Y Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.534-536.833 ◽

2007 ◽

Vol 534-536 ◽

pp. 833-836 ◽

Cited By ~ 8

Author(s):

J.K. Lee ◽

Taek Soo Kim ◽

Ha Guk Jeong ◽

Jung Chan Bae

Keyword(s):

Mechanical Properties ◽

Solid Solution ◽

Tensile Strength ◽

Ultimate Tensile Strength ◽

Spark Plasma Sintering ◽

Plasma Sintering ◽

Spark Plasma ◽

Solid Solution Matrix ◽

Solution Matrix ◽

Consolidation Temperature

The microstructure and mechanical properties of the Mg97Zn1Y2 alloy prepared by spark plasma sintering of gas atomized powders have been investigated. After consolidation, precipitates were observed to form in the α-Mg solid solution matrix of the Mg97Zn1Y2 alloy. These precipitates consisted of Mg12YZn and Mg24Y5 phases. The density of the consolidated bulk Mg-Zn-Y alloy was 1.86 g/cm3. The ultimate tensile strength and elongation were dependent on the consolidation temperature, which were in the ranges of 280 to 293 MPa and 8.5 to 20.8 %, respectively.

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