Creep strength of refractory high-entropy alloy TiZrHfNbTa and comparison with Ni-base superalloy CMSX-4

Gadelmeier, Christian; Yang, Ying; Glatzel, Uwe; George, E.P.

doi:10.1016/j.xcrp.2022.100991

Cited by 14 publications

(5 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An AgieCharmilles Cut 200 SP wire-cut electrical discharge machine is used to slice the ingots into ~1 mm thick sheets. The second specimen type, called rolled state, is TiZrNbHfTa derived through cold-rolling an arc-melted ingot after 48 h of homogenization at 1200 °C under vacuum, as described by Gadelmeier et al [23]. A final sheet thickness of ~1 mm is obtained after a ~90 % thickness reduction during the rolling process.…”

Section: Materials Synthesismentioning

confidence: 99%

Surface hardening of TiZrNbHfTa high entropy alloy via oxidation

et al. 2023

Self Cite

View full text Add to dashboard Cite

Section: Materials Synthesismentioning

confidence: 99%

Surface hardening of TiZrNbHfTa high entropy alloy via oxidation

et al. 2023

Self Cite

View full text Add to dashboard Cite

“…One such class comprises the RHEAs which, because of their high melting points, have been proposed as candidates for ultrahigh-temperature applications 3 – 6 . However, a single-phase RHEA, TiZrHfNbTa, was recently shown to be significantly weaker in creep than CMSX-4 despite the former’s higher melting point 7 . The weakness was ascribed to two factors: faster diffusion in the BCC matrix of the RHEA relative to the FCC matrix of CMSX-4 and a lack of precipitates.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, RHEAs with higher melting points must also be investigated since diffusion will be slower in such materials. One such RHEA is VNbMoTaW 8 , whose melting point is ~500 °C higher than TiZrHfNbTa 7 , 9 , 10 . However, it has a major disadvantage: lack of ductility at room temperature even in compression 8 .…”

Section: Introductionmentioning

confidence: 99%

“…Structural materials, even those targeting primarily high-temperature applications, need some minimal ductility at room temperature to withstand routine handling, accidental drops, thermal shocks, etc. The dilemma we face is that TiZrHfNbTa possesses tensile ductility 12 , 17 but poor creep strength 7 , whereas VNbMoTaW while potentially having sufficient creep strength (although that remains to be determined), is dead brittle.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Intrinsic factors responsible for brittle versus ductile nature of refractory high-entropy alloys

Tsuru,

Han,

Matsuura

et al. 2024

Nat Commun

Self Cite

View full text Add to dashboard Cite

Refractory high-entropy alloys (RHEAs) are of interest for ultrahigh-temperature applications. To overcome their drawbacks — low-temperature brittleness and poor creep strength at high temperatures — improved fundamental understanding is needed. Using experiments, theory, and modeling, we investigated prototypical body-centered cubic (BCC) RHEAs, TiZrHfNbTa and VNbMoTaW. The former is compressible to 77 K, whereas the latter is not below 298 K. Hexagonal close-packed (HCP) elements in TiZrHfNbTa lower its dislocation core energy, increase lattice distortion, and lower its shear modulus relative to VNbMoTaW whose elements are all BCC. Screw dislocations dominate TiZrHfNbTa plasticity, but equal numbers of edges and screws exist in VNbTaMoW. Dislocation cores are compact in VNbTaMoW and extended in TiZrHfNbTa, and different macroscopic slip planes are activated in the two RHEAs, which we attribute to the concentration of HCP elements. Our findings demonstrate how ductility and strength can be controlled through the ratio of HCP to BCC elements in RHEAs.

show abstract

“…This research was mainly driven by the need for more heat-resistant materials in aircraft engine turbosuperchargers. It has been paced in the 1940s by the increasing demands of the gas turbine engine technology, and in the early 1950s by space based nuclear reactor programs (Fawley et al, 1972;Philips et al, 2020). Ni-based superalloys with their unique combination of mechanical and physical properties at temperatures up to 1,150 °C (Rame et al, 2020) have since been the staple structural material of high temperature applications.…”

Section: Introductionmentioning

confidence: 99%

A short review on the ultra-high temperature mechanical properties of refractory high entropy alloys

Atli

Караман

2023

Front. Met. Alloy

View full text Add to dashboard Cite

Mechanical properties of refractory high entropy alloys (RHEAs) at ultra-high temperatures (>1,100°C) are reviewed. Deformation behavior and strengthening mechanisms of select compositions are discussed. The limited number of studies portray remarkable mechanical properties of newly developed RHEA compositions at temperatures beyond the melting point of commercial Ni-based superalloys. Yet, the lack of quasi-static tensile deformation data and application relevant creep deformation data indicates RHEAs are still far from being reliable alternatives to Ni-based superalloys as high temperature structural materials. Future studies should concentrate on tensile deformation and creep of these new alloys systems at very high temperatures.

show abstract

Creep strength of refractory high-entropy alloy TiZrHfNbTa and comparison with Ni-base superalloy CMSX-4

Cited by 14 publications

References 19 publications

Surface hardening of TiZrNbHfTa high entropy alloy via oxidation

Surface hardening of TiZrNbHfTa high entropy alloy via oxidation

Intrinsic factors responsible for brittle versus ductile nature of refractory high-entropy alloys

A short review on the ultra-high temperature mechanical properties of refractory high entropy alloys

Contact Info

Product

Resources

About