scholarly journals A Novel Non-Equiatomic (W35Ta35Mo15Nb15)95Ni5 Refractory High Entropy Alloy with High Density Fabricated by Powder Metallurgical Process

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1436
Author(s):  
Bohua Duan ◽  
Yingrui Yu ◽  
Xinli Liu ◽  
Dezhi Wang ◽  
Zhuangzhi Wu
Keyword(s):  
Mechanical Alloying ◽  
Fracture Strain ◽  
Oxide Inclusion ◽  
High Density ◽  
High Entropy Alloy ◽  
Metallurgical Process ◽  
High Entropy ◽  
Powder Metallurgical Process ◽  
Plasma Sintering ◽  
Spark Plasma

A non-equiatomic refractory high entropy alloy (RHEA), (W35Ta35Mo15Nb15)95Ni5 with high density of 14.55 g/cm3 was fabricated by powder metallurgical process of mechanical alloying (MA) and spark plasma sintering (SPS). The mechanical alloying behavior of the metallic powders was studied systematically, and the microstructure and phase composition for both the powders and alloys were analyzed. Results show that the crystal consists of the primary solid solution and marginal oxide inclusion (Nb5.7Ni4Ta2.3O2). In addition, the maximum strength, yield strength and fracture strain are, 2562 MPa, 2128 MPa, 8.16%, respectively.

scholarly journals Spark Plasma Sintering of CoCrFeMnNi High-entropy Alloy Powders Produced by Mechanical Alloying

Materia Japan ◽  
2018 ◽  
Vol 57 (7) ◽  
pp. 333-337
Author(s):  
Soo-Hyun Joo ◽  
Takeshi Wada ◽  
Hidemi Kato ◽  
Soon-Jik Hong ◽  
Hyoung Seop Kim
Keyword(s):  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Plasma Sintering ◽  
Spark Plasma

Compression stress strengthening modelling of a ultrafine-grained equiatomic SPS CoCrFeNiNb high-entropy alloy

2020 ◽  
pp. 095440622094324
Author(s):  
Marcello Cabibbo ◽  
Filip Průša ◽  
Alexandra Šenková ◽  
Andrea Školáková ◽  
Vojtěch Kučera ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Mechanical Alloying ◽  
Oxide Phase ◽  
High Entropy Alloy ◽  
Induction Melting ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Plasma Sintering ◽  
Transmission Electron ◽  
Spark Plasma

High-entropy alloys are known to show exceptionally high mechanical properties, both compression and tensile strength, and unique physical properties, such as their phase stability. These quite unusual properties are primarily due to the microstructure generated by mechanical alloying processes, such as conventional induction arc melting, powder metallurgy, or mechanical alloying. In the present study, an equiatomic CoCrFeNiNb high-entropy alloy was prepared by a sequence of conventional induction melting, powder metallurgy, and compaction via spark plasma sintering. The high-entropy alloys showed uniform sub-micrometer grain microstructure consisted by a mixture of an fcc solid solution strengthened by a hcp Laves phase and a third intergranular oxide phase. The as-cast high-entropy alloys showed an ultimate compression strength (UCS) of ∼1400 MPa, which after sintering and compaction at 1273 K increased up to ∼2400 MPa. Extensive transmission electron microscopy quantitative analyses were carried out to model the UCS. A quite good agreement between the microstructure-strengthening model and the experimental UCS was found.

Mechanical alloying and spark plasma sintering of AlCrCuFeZn high entropy alloy

2020 ◽  
Vol 36 (17) ◽  
pp. 1861-1869
Author(s):  
Kátia Regina Cardoso ◽  
Bruno da Silva Izaias ◽  
Leonardo de Souza Vieira ◽  
André Mello Bepe
Keyword(s):  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Plasma Sintering ◽  
Spark Plasma
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