Tensile creep behavior of HfNbTaTiZr refractory high entropy alloy at elevated temperatures

Liu, Che-Jen; Gadelmeier, Christian; Lu, Shyue-Kung; Yen, Hung‐Wei; Gorsse, Stéphane; Glatzel, Uwe; Yeh, An‐Chou

doi:10.1016/j.actamat.2022.118188

Cited by 37 publications

(4 citation statements)

References 81 publications

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“…Arc‐melted equiatomic HfNbTaTiZr is well known to display a metastable single β‐BCC phase, which is the microstructure that has been so far studied and tested in the literature. [ 23 , 25 , 43 ] However, a multiphase (β‐BCC1 + β‐BCC2 + α‐HCP) microstructure is obtained in our specimens, after a very different processing route, i.e., sintering at 1400 °C for 18 h followed by slow cooling (5 °C min −1 ). To understand the reason for the formation of the current microstructure, a 1 h homogenization at 1500 °C followed by water quenching is performed to simulate the cooling rate of arc melting.…”

Section: Resultsmentioning

confidence: 88%

Ink‐Extrusion 3D Printing and Silicide Coating of HfNbTaTiZr Refractory High‐Entropy Alloy for Extreme Temperature Applications

Zhang,

Hsu,

Dunand

2024

Advanced Science

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An oxygen‐resistant refractory high‐entropy alloy is synthesized in microlattice or bulk form by 3D ink‐extrusion printing, interdiffusion, and silicide coating. Additive manufacturing of equiatomic HfNbTaTiZr is implemented by extruding inks containing hydride powders, de‐binding under H2, and sintering under vacuum. The sequential decomposition of hydride powders (HfH2+NbH+TaH0.5+TiH2+ZrH2) is followed by in situ X‐ray diffraction. Upon sintering at 1400 °C for 18 h, a nearly fully densified, equiatomic HfNbTaTiZr alloy is synthesized; on slow cooling, both α‐HCP and β‐BCC phases are formed, but on quenching, a metastable single β‐BCC phase is obtained. Printed and sintered HfNbTaTiZr alloys with ≈1 wt.% O shows excellent mechanical properties at high temperatures. Oxidation resistance is achieved by silicide coating via pack cementation. A small‐size lattice‐core sandwich is fabricated and tested with high‐temperature flames to demonstrate the versatility of this sequential approach (printing, sintering, and siliconizing) for high‐temperature, high‐stress applications of refractory high‐entropy alloys.

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Section: Resultsmentioning

confidence: 88%

Ink‐Extrusion 3D Printing and Silicide Coating of HfNbTaTiZr Refractory High‐Entropy Alloy for Extreme Temperature Applications

Zhang,

Hsu,

Dunand

2024

Advanced Science

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“…A more recent study reported the tensile creep properties of HfNbTaTiZr RHEA up to 1,250 °C under stress levels of 5-30 MPa (Liu et al, 2022). The creep behavior was related to the solute drag mechanism evidenced by the stress exponent n ranging between 2.5 and 2.8.…”

Section: Creep Behaviormentioning

confidence: 97%

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

Atli

Караман

2023

Front. Met. Alloy

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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.

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“…As a single-phase BCC alloy, Hf-Nb-Ta-Ti-Zr HEAs have special plasticity characteristics and have been widely studied [9]. Liu et al [10] explored the tensile creep process of HfNbTaTiZr HEA and determined the dominant role of Ta element in this process. The fracture toughness mechanism of HfNbTaTiZr HEA was studied by Fan et al [11], and the fracture toughness KJIC of HEA was determined to be 210 MPa m1/2 by the "single sample" flexibility method which renders this HEA among the toughest metallic materials.…”

Section: Introductionmentioning

confidence: 99%

Composition Design and Tensile Properties of Additive Manufactured Low Density Hf-Nb-Ta-Ti-Zr High Entropy Alloys Based on Atomic Simulations

Liang

et al. 2023

Materials

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High-entropy alloy (HEA) is a new type of multi-principal alloy material and the Hf-Nb-Ta-Ti-Zr HEAs have attracted more and more attention from researchers due to their high melting point, special plasticity, and excellent corrosion resistance. In this paper, in order to reduce the density of the alloy and maintain the strength of the Hf-Nb-Ta-Ti-Zr HEAs, the effects of high-density elements Hf and Ta on the properties of HEAs were explored for the first time based on molecular dynamics simulations. A low-density and high-strength Hf0.25NbTa0.25TiZr HEA suitable for laser melting deposition was designed and formed. Studies have shown that the decrease in the proportion of Ta element reduces the strength of HEA, while the decrease in Hf element increases the strength of HEA. The simultaneous decrease in the ratio of Hf and Ta elements reduces the elastic modulus and strength of HEA and leads to the coarsening of the alloy microstructure. The application of laser melting deposition (LMD) technology refines the grains and effectively solves the coarsening problem. Compared with the as-cast state, the as-deposited Hf0.25NbTa0.25TiZr HEA obtained by LMD forming has obvious grain refinement (from 300 μm to 20–80 μm). At the same time, compared with the as-cast Hf0.25NbTa0.25TiZr HEA (σs = 730 ± 23 MPa), the as-deposited Hf0.25NbTa0.25TiZr HEA has higher strength (σs = 925 ± 9 MPa), which is similar to the as-cast equiatomic ratio HfNbTaTiZr HEA (σs = 970 ± 15 MPa).

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Tensile creep behavior of HfNbTaTiZr refractory high entropy alloy at elevated temperatures

Cited by 37 publications

References 81 publications

Ink‐Extrusion 3D Printing and Silicide Coating of HfNbTaTiZr Refractory High‐Entropy Alloy for Extreme Temperature Applications

Ink‐Extrusion 3D Printing and Silicide Coating of HfNbTaTiZr Refractory High‐Entropy Alloy for Extreme Temperature Applications

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

Composition Design and Tensile Properties of Additive Manufactured Low Density Hf-Nb-Ta-Ti-Zr High Entropy Alloys Based on Atomic Simulations

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