Microstructure and Mechanical Properties of (TiZrHf)50(NiCoCu)50 High Entropy Alloys

Chen, Chih‐Hsuan; Chen, Yue‐Jin; Shen, Jia‐Jyun

doi:10.1007/s12540-019-00383-3

Cited by 22 publications

(9 citation statements)

References 51 publications

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“…The present authors demonstrated that the Ti 16.67 Zr 16.67 Hf 16.67 Ni 25 Co 10 Cu 15 alloy is a HESMA with thermoelastic martensitic transformation [ 23 ]. This alloy is based on the binary TiNi SMA, which showed high solubility of Zr, Hf, Co, and Cu atoms [ 24 ]. In this alloy, Zr and Hf were added to substitute for Ti; Co and Cu were added to substitute for Ni.…”

Section: Introductionmentioning

confidence: 99%

Effect of Solution Treatment on the Shape Memory Functions of (TiZrHf)50Ni25Co10Cu15 High Entropy Shape Memory Alloy

Lee

Chen

2019

Entropy

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This study investigated the effects of solution treatment at 1000 °C on the transformation behaviors, microstructure, and shape memory functions of a novel (TiZrHf)50Ni25Co10Cu15 high entropy shape memory alloy (HESMA). The solution treatment caused partial dissolution of non-oxygen-stabilized Ti2Ni-like phase. This phenomenon resulted in the increment of (Ti, Zr, Hf) content in the matrix and thus increment of the Ms and Af temperatures. At the same time, the solution treatment induced a high entropy effect and thus increased the degree of lattice distortion, which led to increment of the friction force during martensitic transformation, resulting in a broad transformation temperature range. The dissolution of the Ti2Ni-like phase also improved the functional performance of the HESMA by reducing its brittleness and increasing its strength. The experimental results presented in this study demonstrate that solution treatment is an effective and essential way to improve the functional performance of the HESMA.

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Section: Introductionmentioning

confidence: 99%

Effect of Solution Treatment on the Shape Memory Functions of (TiZrHf)50Ni25Co10Cu15 High Entropy Shape Memory Alloy

Lee

Chen

2019

Entropy

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“…When analyzing the values of the compressive strength and plasticity of the synthesized SPS samples, it can be seen that they are very inferior to the samples obtained by conventional technologies. In particular, in [42] At the same time, the plasticity of the synthesized SPS samples is also significantly lower. In [42], it is from 0.63 to 3.8% for these alloys.…”

Section: Discussionmentioning

confidence: 93%

“…A detailed study found that the highest oxygen content is concentrated at the boundaries of the resulting microcracks. The presence of the oxides in the resulting alloys can be explained by the content of undesirable impurities in the initial materials as well as by the absorption of the oxygen by the material during processing The analysis of the mechanical test results for the bulk HEA samples showed that the hardness of the synthesized samples was more than 600 HV which was significantly higher than for any single binary intermetallic such as TiCo, TiNi (250 HV), ZrCo (280 HV), HfCo (250-280 HV) and corresponds to the hardness of HEAs of a similar composition obtained by conventional smelting technologies [42].…”

Section: Discussionmentioning

confidence: 95%

“…This value is 1.281 for the alloys of (TiZrHf) 50 (NiCoCu) 50 type [42]. The relationship between the fraction of the formed phase and the content of Zr + Hf was revealed when analyzing the factors influencing the formation of C15 phase [42]. With an increase in the combined content of Zr and Hf, the proportion of the Laves phase C15 also increases from 1.…”

Section: Discussionmentioning

confidence: 96%

“…Its optimal value for the formation of the Laves phase C15 is 1.32 [43]. This value is 1.281 for the alloys of (TiZrHf) 50 (NiCoCu) 50 type [42]. The relationship between the fraction of the formed phase and the content of Zr + Hf was revealed when analyzing the factors influencing the formation of C15 phase [42].…”

Section: Discussionmentioning

confidence: 97%

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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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Shape Memory Effect and Superelasticity of [001]-Oriented (TiZrHf)50Ni25Co10Cu15 High-Entropy Alloy Crystals Under Compression

et al. 2023

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Microstructure and Mechanical Properties of (TiZrHf)50(NiCoCu)50 High Entropy Alloys

Cited by 22 publications

References 51 publications

Effect of Solution Treatment on the Shape Memory Functions of (TiZrHf)50Ni25Co10Cu15 High Entropy Shape Memory Alloy

Effect of Solution Treatment on the Shape Memory Functions of (TiZrHf)50Ni25Co10Cu15 High Entropy Shape Memory Alloy

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

Shape Memory Effect and Superelasticity of [001]-Oriented (TiZrHf)50Ni25Co10Cu15 High-Entropy Alloy Crystals Under Compression

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