Effect of Al addition on mechanical properties and microstructure of refractory AlxHfNbTaTiZr alloys

Lin, Chun-Ming; Juan, Chien-Chang; Chang, Chia-Hsiu; Tsai, Che-Wei; Yeh, Jien‐Wei

doi:10.1016/j.jallcom.2014.11.064

Cited by 248 publications

(55 citation statements)

References 32 publications

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“…Unfortunately, the experimental equilibrium WS radii are only available to AlxHf1−xNbTaTiZr (x = 0, 0.4) [11,39]. With the increase of Al content, the theoretical WS radius of HEAs decreases from 3.216 to 3.127 Bohr, which is in line with the trend of experimental WS radius measured by x-ray diffraction.…”

Section: Equilibrium Volumesupporting

confidence: 62%

“…Our calculated average Young's modulus E = 111.9 GPa is slightly large, comparing with the experimental E = 78.1 GPa at room temperature [11]. The large deviation is between our calculated E = 104.2 GPa and the experimental E ≈ 55 GPa [39] for HfNbTaTiZr. It should be emphasized that all present calculations were carried out at static conditions (0 K) and the present HEAs are assumed an ideal solid solution phase with bcc underlying lattice.…”

Section: Polycrystalline Elastic Modulisupporting

confidence: 61%

“…The theoretical results for AlxHf1−xNbTaTiZr are plotted in Figure 2. To our knowledge, there are is available experimental information on the polycrystalline elastic moduli of the AlxHf1−xNbTaTiZr HEAs, expect for Al 0.4 Hf 0.6 NbTaTiZr [11] and HfNbTaTiZr [39]. For the present HEAs, the bulk modulus B changes from 134.0 to 149.7 GPa, G from 38.0 to 44.9 GPa, E from 104.2 to 122.6 GPa.…”

Section: Cubic Elastic Constantsmentioning

confidence: 73%

“…These small errors might be due to the effect of temperature neglected in the present calculations. Although the similar measure method was employed, the experimental Wigner-Seitz radius w = 3.168 Bohr from Reference [11] is smaller than w = 3.178 Bohr from Ref [39]. To further assess the theoretical equilibrium WS radii, we make use of Vegard's law to estimate the equilibrium WS radius by using the WS radius of the alloy components.…”

Section: Equilibrium Volumementioning

confidence: 99%

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Ab Initio Predicted Alloying Effects on the Elastic Properties of AlxHf1−xNbTaTiZr High Entropy Alloys

Tian

2015

Coatings

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Abstract:Using ab initio alloy theory, we investigate the equilibrium bulk properties and elastic mechanics of the single bcc solid-solution AlxHf1−xNbTaTiZr (x = 0-0.7, 1.0) high entropy alloys. Ab initio predicted equilibrium volume is consistent with the available experiment. We make a detailed investigation of the alloying effect of Al and Hf on the equilibrium volume, elastic constants and polycrystalline elastic moduli. Results imply that the partial replacement Hf with Al increases the stability of the bcc phase and decreases the ductility of the AlxHf1−xNbTaTiZr HEAs. The inner ductility of Al0.4Hf0.6NbTaTiZr is predicted by the calculations of ideal tensile strength.

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Section: Equilibrium Volumesupporting

confidence: 62%

Section: Polycrystalline Elastic Modulisupporting

confidence: 61%

Section: Cubic Elastic Constantsmentioning

confidence: 73%

Section: Equilibrium Volumementioning

confidence: 99%

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Ab Initio Predicted Alloying Effects on the Elastic Properties of AlxHf1−xNbTaTiZr High Entropy Alloys

Tian

2015

Coatings

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“…Therefore, these alloys have great potential in high temperature applications. Many other refractory HEAs were developed later to obtain improved strength, room temperature ductility, and density [40,41,[47][48][49][50][51][52][53][54]. For example, Al addition in certain systems can bring advantages such as higher hardness and high-temperature strength, better room temperature plasticity, and lower density [48].…”

Section: Refractory Heasmentioning

confidence: 99%

Three Strategies for the Design of Advanced High-Entropy Alloys

Tsai

2016

Entropy

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High-entropy alloys (HEAs) have recently become a vibrant field of study in the metallic materials area. In the early years, the design of HEAs was more of an exploratory nature. The selection of compositions was somewhat arbitrary, and there was typically no specific goal to be achieved in the design. Very recently, however, the development of HEAs has gradually entered a different stage. Unlike the early alloys, HEAs developed nowadays are usually designed to meet clear goals, and have carefully chosen components, deliberately introduced multiple phases, and tailored microstructures. These alloys are referred to as advanced HEAs. In this paper, the progress in advanced HEAs is briefly reviewed. The design strategies for these materials are examined and are classified into three categories. Representative works in each category are presented. Finally, important issues and future directions in the development of advanced HEAs are pointed out and discussed.

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Oxidation Behavior between 700 and 1300 °C of Refractory TiZrNbHfTa High‐Entropy Alloys Containing Aluminum

2018

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Refractory alloys without Cr, Al, and Si additions exhibit very poor high temperature oxidation resistance and thus significantly limit their applications. With an aim to improve the poor oxidation resistance of strong and ductile refractory TiZrNbHfTa high-entropy alloys (HEAs), this study investigates the effect of Al additions on the oxidation behavior and mechanisms for Al 0-1 TiZrNbHfTa HEAs. Higher Al content renders the alloy more resistant to oxidation. The AlTiZrNbHfTa alloy exhibits a mass gain twice of that of conventional Ni-based alloys at 1100 C for 1 h, but much less than Nb refractory alloys because an Al-containing oxide on the surface layer provides a partial barrier against oxidation between 700 and 1100 C. But, at 1300 C the Al-containing alloys exhibit poor oxidation resistance because the less dense oxide layers provide oxygen with an effective diffusional channel and enable oxygen to penetrate the substrate more easily.

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Effect of Al addition on mechanical properties and microstructure of refractory AlxHfNbTaTiZr alloys

Cited by 248 publications

References 32 publications

Ab Initio Predicted Alloying Effects on the Elastic Properties of AlxHf1−xNbTaTiZr High Entropy Alloys

Ab Initio Predicted Alloying Effects on the Elastic Properties of AlxHf1−xNbTaTiZr High Entropy Alloys

Three Strategies for the Design of Advanced High-Entropy Alloys

Oxidation Behavior between 700 and 1300 °C of Refractory TiZrNbHfTa High‐Entropy Alloys Containing Aluminum

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