Hierarchical microstructure strengthening in a single crystal high entropy superalloy

Chen, Yung Ta; Chang, Yu‐Jung; Murakami, Hideyuki; Sasaki, Taisuke; Hara, Kazuhiro; Li, Chen Wei; Kakehi, Koji; Yeh, Jien Wei; Yeh, An‐Chou

doi:10.1038/s41598-020-69257-8

Cited by 29 publications

(15 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chen, Chang [56] studied the hierarchical microstructural strengthening of HESAs and the composition of strengthening elements can consist of Cu, Fe, Ti, Zr, Co, V, Al, Nb, Cr and Mn. While the overall structure can comprise Mn, Ni, Fe, Ti, Co, Cr and V while for the grain boundary strengthening; C, B and Hf are added but must not be over 15% of the superalloy's total compositional weight.…”

Section: High Entropy Superalloys (Hesas)mentioning

confidence: 99%

Recent Advances of High Entropy Alloys: High Entropy Superalloys

Dada¹,

Popoola²,

Mathe³

et al. 2021

Advances in High-Entropy Alloys - Materials Research, Exotic Properties and Applications

View full text Add to dashboard Cite

show abstract

Section: High Entropy Superalloys (Hesas)mentioning

confidence: 99%

Recent Advances of High Entropy Alloys: High Entropy Superalloys

Dada¹,

Popoola²,

Mathe³

et al. 2021

Advances in High-Entropy Alloys - Materials Research, Exotic Properties and Applications

View full text Add to dashboard Cite

show abstract

“…The high-entropy solid solutions are typically FCC alloys, BCC alloys, and also amorphous-structured alloys (high-entropy bulk metallic glass), but HCP-structured alloys were also reported [3]. Actually, there has been a great increase in the number of works that report on these novel microstructures with excellent properties [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Comparative EIS Study of AlxCoCrFeNi Alloys in Ringer’s Solution for Medical Instruments

Perdomo

Suárez

Voiculescu

et al. 2021

Metals

View full text Add to dashboard Cite

Depending on the properties required for the medical instruments, compared with the classical materials, the high-entropy alloys (HEAs) are a versatile option. Electrochemical Impedance Spectroscopy (EIS) measurements have been performed on AlxCoCrFeNi-type high-entropy alloys with various concentrations of Al content (x = 0.6, 0.8, and 1.0) in order to characterize their passive film and corrosion resistance at 37 °C under infectious simulated physiological conditions (Ringer´s solution acidulated with HCl) at pH = 3. The impedance spectra were obtained at different potential values between −0.7 and +0.7 V vs. SCE. Analysis of the impedance spectra was carried out by fitting different equivalent circuits to the experimental data. Two equivalent circuits, with one time constant and two time constants respectively, can be satisfactorily used for fitting the spectra: one time constant represents the characteristics of the compact passive film, and the second one is for the porous passive film. With the decreasing of Al content, the obtained EIS results are correlated with the evolution of the microhardness and microstructure, which is characterized by Optical Microscopy (OM), Scanning Electron Microscopy (SEM), and Energy-Dispersive X-Ray Spectroscopy (EDAX). It can be observed for all alloys that the resistance of the passive film is very high and decreases with the potential: the very high resistance of the passive film implies a high corrosion resistance, which can be assigned to the formation of the protective oxide layer and demonstrates that the analyzed alloys fulfill the prerequisites for their use as new materials for the manufacturing of medical instruments.

show abstract

“…This research focuses on recently developed HESA [8]. HESA has an approximately 70 % volume fraction of the γ precipitates, which could make it a candidate for such materials as turbine blades [9,10]. The previous research on microstructural characterizations of HESA by heat treatment conditions revealed that the primary γ precipitates grow rapidly and change in their shape from the original microstructure over 870 • C [11].…”

Section: Introductionmentioning

confidence: 99%

Tensile Creep Behavior of Single-Crystal High-Entropy Superalloy at Intermediate Temperature

et al. 2020

Self Cite

View full text Add to dashboard Cite

In this study, we investigated the creep deformation mechanism of a single-crystal high-entropy superalloy (HESA) with the spherical γ′ precipitates at 760 °C. Before the creep tests, long-term aging tests at 760 °C without load were conducted, which showed Ostwald ripening of the secondary γ′ precipitates up to 50 h. The creep tests revealed that in the range of 500 and 600 MPa at 760 °C, the creep deformation mechanism of HESA was independent of applied stress in both the primary and secondary creep regions. The deformation mechanism of HESA was further investigated under the condition of 760 °C and 520 MPa by performing creep interrupted tests and microstructural analysis. Scanning electron microscope observation showed elongated γ′ precipitates along the applied stress axis near the ruptured surface. This could have been caused by the multi-slip around <100> preceded by the lattice rotation into <100> along the tensile axis, which was confirmed by the electron backscatter diffraction analysis. Transmission electron microscope observation of the creep interrupted and ruptured specimens showed bypass and climb motion of dislocations in the 2-h interrupted, shearing of the γ′ precipitates by the paired straight dislocations in the 50-h interrupted, and shearing of the γ′ precipitates by both the straight and the curved paired dislocations in the ruptured specimens, respectively. The secondary γ′ precipitates do not affect creep behavior as long as the deformation mechanism is a bypass and climb motion of dislocations.

show abstract

Hierarchical microstructure strengthening in a single crystal high entropy superalloy

Cited by 29 publications

References 65 publications

Recent Advances of High Entropy Alloys: High Entropy Superalloys

Recent Advances of High Entropy Alloys: High Entropy Superalloys

Comparative EIS Study of AlxCoCrFeNi Alloys in Ringer’s Solution for Medical Instruments

Tensile Creep Behavior of Single-Crystal High-Entropy Superalloy at Intermediate Temperature

Contact Info

Product

Resources

About