Spark plasma sintering behavior of TaNbHfZrTi high-entropy alloy powder synthesized by hydrogenation-dehydrogenation reaction

Park, Ki Beom; Park, Jae Young; Kim, Jae Won; Na, Tae‐Wook; Mo, Chan Bin; Choi, Jong In; Choi, Jun; Kang, Hyun Su; Park, Hyung Ki

doi:10.1016/j.intermet.2020.107077

Cited by 10 publications

(2 citation statements)

References 36 publications

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“…In addition, the contents of impurity elements, especially the oxygen, are low. The oxygen contents of the spherical TaNbTiZr RHEA powders prepared in this work and other similar spherical RHEA powders [ 22 , 23 , 30 ] are listed in Table 2 . Obviously, the oxygen content in the EIGAed powders (845 ppm) and PREPed powders (777 ppm) is significantly lower than that of the spherical high-activity RHEA powders prepared by plasma spheroidization method (~1700 ppm).…”

Section: Resultsmentioning

confidence: 99%

Preparation and Microstructure of High-Activity Spherical TaNbTiZr Refractory High-Entropy Alloy Powders

Gao

Xie

et al. 2023

Materials

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High-activity spherical TaNbTiZr refractory high-entropy alloy (REHA) powders were successfully prepared by electrode induction melting gas atomization (EIGA) and plasma rotating electrode process (PREP) methods. Both the EIGAed and PREPed TaNbTiZr RHEA powders have a single-phase body-centered cubic (BCC) structure and low oxygen content. Compared with the EIGAed powders, the PREPed powders exhibit higher sphericity and smoother surface, but larger particle size. The average particle sizes of the EIGAed and PREPed powders are 51.8 and 65.9 μm, respectively. In addition, both the coarse EIGAed and PREPed powders have dendritic structure, and the dendrite size of the EIGAed powders is larger than that of the PREPed powders. Theoretical calculation indicates that the cooling rate of the PREPed powders is one order of magnitude higher than that of the EIGAed powders during the solidification process, and the dendritic structure has more time to grow during EIGA, which is the main reason for the coarser dendrite size of the EIGAed powders.

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Section: Resultsmentioning

confidence: 99%

Preparation and Microstructure of High-Activity Spherical TaNbTiZr Refractory High-Entropy Alloy Powders

Gao

Xie

et al. 2023

Materials

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“…One of the modern methods of PM is spark plasma sintering (SPS) which consists of the combined action of external pressure and passing a pulsed pulsating current through the powder that intensifies sintering. In [36][37][38][39][40], the possibility of using SPS to obtain compact samples with a relative density about 99% from powders of refractory HEAs was shown. The general trend in these works is to refine the grain in comparison to ingots obtained by conventional methods that leads to a significant increase in yield strength, ultimate strength and hardness but also reduces the plastic properties.…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of a High-Entropy Ti-Zr-Hf-Ni-Co-Cu Alloy Obtained by Mechanical Alloying and Spark Plasma Sintering

Razumov

Makhmutov

Kim

et al. 2021

Metallogr. Microstruct. Anal.

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In this paper, the synthesis of a high-entropy Ti-Zr-Hf-Ni-Co-Cu alloy (HEA) by powder metallurgy (PM) methods was investigated. This alloy is prospective from high-temperature shape memory effect point of view. The composition of (TiZrHf) 50 Ni 25 Co 10 Cu 15 was chosen for the study as it promised to show high functional properties. In order to synthesize the alloy, spark plasma sintering (SPS) of its spherical powder was used. The spherical powders were previously obtained by mechanical alloying of elemental powders and subsequent plasma spheroidization (PS). It was shown that the structure of the bulk samples consisted of B2-TiNi-type austenite, low-melting eutectic CuZr and C15 Laves phase. The eutectic, which precipitates during the SPS process, prevents deforming spherical particles and leads to low mechanical properties since the material does not work as a monolith one. The compressive ultimate stress was 425 ± 15 MPa. However, the hardness of more than 600 HV that is higher than for any binary intermetallic compounds consisted of the HEA elements promises good prospects of PM methods for production of such alloys. For this purpose, a problem of high oxygen content that also results in the liability to brittle fracture should be solved.

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Synthesis and Processing of High‐Entropy Materials

2023

High‐Entropy Materials

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Spark plasma sintering behavior of TaNbHfZrTi high-entropy alloy powder synthesized by hydrogenation-dehydrogenation reaction

Cited by 10 publications

References 36 publications

Preparation and Microstructure of High-Activity Spherical TaNbTiZr Refractory High-Entropy Alloy Powders

Preparation and Microstructure of High-Activity Spherical TaNbTiZr Refractory High-Entropy Alloy Powders

Structure and Properties of a High-Entropy Ti-Zr-Hf-Ni-Co-Cu Alloy Obtained by Mechanical Alloying and Spark Plasma Sintering

Synthesis and Processing of High‐Entropy Materials

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