Pd20Pt20Cu20Ni20P20 high-entropy alloy as a bulk metallic glass in the centimeter

Takeuchi, Akira; Chen, N.; Wada, Takeshi; Yokoyama, Yoshihiko; Kato, Hidemi; Inoue, Akihisa; Yeh, Jien‐Wei

doi:10.1016/j.intermet.2011.05.030

Cited by 220 publications

(70 citation statements)

References 41 publications

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“…The revised Perdew-Burke-Ernzerhof [19] gradient approximation to the exchange-correlation functional was used. Cubic supercells of 200 atoms that correspond to the compositions of Al 1.3 CoCrCuFeNi [20], HfNbTaTiZr, and CuNiPPdPt [21] were built. The choice of these three representative compositions is that they form multi-phases, single-phase solid solution, and amorphous structure upon cooling from liquid respectively.…”

Section: Computational Methodologiesmentioning

confidence: 99%

Searching for Next Single-Phase High-Entropy Alloy Compositions

Gao

Alman

2013

Entropy

280

111

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There has been considerable technological interest in high-entropy alloys (HEAs) since the initial publications on the topic appeared in 2004. However, only several of the alloys investigated are truly single-phase solid solution compositions. These include the FCC alloys CoCrFeNi and CoCrFeMnNi based on 3d transition metals elements and BCC alloys NbMoTaW, NbMoTaVW, and HfNbTaTiZr based on refractory metals. The search for new single-phase HEAs compositions has been hindered by a lack of an effective scientific strategy for alloy design. This report shows that the chemical interactions and atomic diffusivities predicted from ab initio molecular dynamics simulations which are closely related to primary crystallization during solidification can be used to assist in identifying single phase high-entropy solid solution compositions. Further, combining these simulations with phase diagram calculations via the CALPHAD method and inspection of existing phase diagrams is an effective strategy to accelerate the discovery of new single-phase HEAs. This methodology was used to predict new singlephase HEA compositions. These are FCC alloys comprised of CoFeMnNi, CuNiPdPt and CuNiPdPtRh, and HCP alloys of CoOsReRu.

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Section: Computational Methodologiesmentioning

confidence: 99%

Searching for Next Single-Phase High-Entropy Alloy Compositions

Gao

Alman

2013

Entropy

280

111

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“…Gibbs free energy assessments, need to be taken into account. [47] Apparently more study is needed to understand these issues.…”

Section: High-entropy Bulk Metallic Glass Althoughmentioning

confidence: 99%

High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

2,622

853

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High-entropy alloys (HEAs) are alloys with five or more principal elements. Due to the distinct design concept, these alloys often exhibit unusual properties. Thus, there has been significant interest in these materials, leading to an emerging yet exciting new field. This paper briefly reviews some critical aspects of HEAs, including core effects, phases and crystal structures, mechanical properties, high-temperature properties, structural stabilities, and corrosion behaviors. Current challenges and important future directions are also pointed out.

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“…This paper principally describes high-entropy (H-E) alloys [1] and bulk metallic glasses (BMGs) [2], together with relevant high-entropy bulk metallic glasses (HE-BMGs) [3][4][5][6][7] by focusing on entropy as well as enthalpy from thermodynamic quantaties. The H-E alloys and BMGs are classified into the same alloy group in point that they are formed into a solid solution, although they have completely different crystallographic structures.…”

Section: Introductionmentioning

confidence: 99%

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

Takeuchi

Amiya

Wada

et al. 2013

Entropy

114

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High-entropy (H-E) alloys, bulk metallic glasses (BMGs) and high-entropy BMGs (HE-BMGs) were statistically analyzed with the help of a database of ternary amorphous alloys. Thermodynamic quantities corresponding to heat of mixing and atomic size differences were calculated as a function of composition of the multicomponent alloys. Actual calculations were performed for configurational entropy (S config. ) in defining the H-E alloys and mismatch entropy (S  ) normalized with Boltzmann constant (k B ), together with mixing enthalpy (H mix ) based on Miedema's empirical model and Delta parameter () as a corresponding parameter to S  /k B . The comparison between H mix - and H mix -σ B S k diagrams for the ternary amorphous alloys revealed S  /k B ~ ( /22) 2 . The zones S, S′ and B's where H-E alloys with disordered solid solutions, ordered alloys and BMGs are plotted in the H mix - diagram are correlated with the areas in the H mix -S  /k B diagram. The results provide mutual understandings among H-E alloys, BMGs and HE-BMGs.

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Pd20Pt20Cu20Ni20P20 high-entropy alloy as a bulk metallic glass in the centimeter

Cited by 220 publications

References 41 publications

Searching for Next Single-Phase High-Entropy Alloy Compositions

Searching for Next Single-Phase High-Entropy Alloy Compositions

High-Entropy Alloys: A Critical Review

Entropies in Alloy Design for High-Entropy and Bulk Glassy Alloys

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