Effect of particle size, pressure and temperature on the activation process of hydrogen absorption in TiVZrHfNb high entropy alloy

2021 ◽  
pp. 158615
Author(s):  
Salma Sleiman ◽  
Jacques Huot
Keyword(s):  
Particle Size ◽  
Hydrogen Absorption ◽  
High Entropy Alloy ◽  
Activation Process ◽  
High Entropy ◽  
Effect Of Particle Size

Superplasticity of AlCoCrCuFeNi High Entropy Alloy

2012 ◽  
Vol 735 ◽  
pp. 146-151 ◽  
Author(s):  
Andrey V. Kuznetsov ◽  
Dmitry G. Shaisultanov ◽  
Nikita Stepanov ◽  
Gennady A. Salishchev ◽  
Oleg N. Senkov
Keyword(s):  
Particle Size ◽  
Strain Rate ◽  
Superplastic Deformation ◽  
Tensile Ductility ◽  
Rate Sensitivity ◽  
Particle Growth ◽  
High Entropy Alloy ◽  
Superplastic Behavior ◽  
High Entropy ◽  
Elongation To Failure

An AlCoCrCuFeNi high entropy alloy was multiaxially isothermally forged at 950°C to produce a fine equiaxed structure with the average grain/particle size of ~1.5 µm. The forged alloy exhibited superplastic behavior in the temperature range of 800-1000°C. For example, during deformation at a strain rate of 10-3 s-1, tensile ductility increased from 400% to 860% when the temperature increased from 800°C to 1000°C. An increase in strain rate from 10-4 to 10-2 s-1 at T = 1000°C did not affect ductility: elongation to failure was about 800%. The strain rate sensitivity of the flow stress was rather high, m = 0.6, which is typical to the superplastic behavior. The equiaxed morphology of grains and particles retained after the superplastic deformation, although some grain/particle growth was observed.

scholarly journals A Novel TiZrHfMoNb High-Entropy Alloy for Solar Thermal Energy Storage

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 248 ◽  
Author(s):  
Huahai Shen ◽  
Jianwei Zhang ◽  
Jutao Hu ◽  
Jinchao Zhang ◽  
Yiwu Mao ◽  
...  
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Hydrogen Absorption ◽  
Solar Thermal ◽  
High Entropy Alloy ◽  
Solar Thermal Energy ◽  
High Entropy ◽  
Bcc Structure ◽  
Fcc Structure

An equiatomic TiZrHfMoNb high-entropy alloy (HEA) was developed as a solar thermal energy storage material due to its outstanding performance of hydrogen absorption. The TiZrHfMoNb alloy transforms from a body-centered cubic (BCC) structure to a face-centered cubic (FCC) structure during hydrogen absorption and can reversibly transform back to the BCC structure after hydrogen desorption. The theoretical calculations demonstrated that before hydrogenation, the BCC structure for the alloy has more stable energy than the FCC structure while the FCC structure is preferred after hydrogenation. The outstanding hydrogen absorption of the reversible single-phase transformation during the hydrogen absorption–desorption cycle improves the hydrogen recycling rate and the energy efficiency, which indicates that the TiZrHfMoNb alloy could be an excellent candidate for solar thermal energy storage.

A Density Functional Theory Study of the Hydrogen Absorption in High Entropy Alloy TiZrHfMoNb

2020 ◽  
Vol 59 (14) ◽  
pp. 9774-9782 ◽  
Author(s):  
Jutao Hu ◽  
Jinjing Zhang ◽  
Haiyan Xiao ◽  
Lei Xie ◽  
Huahai Shen ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Hydrogen Absorption ◽  
Density Functional ◽  
High Entropy Alloy ◽  
Density Functional Theory Study ◽  
Functional Theory ◽  
High Entropy

Study on hydrogen absorption and surface properties of TiZrVNbCr high entropy alloy

2021 ◽  
Vol 130 ◽  
pp. 107074
Author(s):  
Ki Beom Park ◽  
Jae-Young Park ◽  
Young Do Kim ◽  
Jong-In Choi ◽  
Hyeon-Tae Im ◽  
...  
Keyword(s):  
Surface Properties ◽  
Hydrogen Absorption ◽  
High Entropy Alloy ◽  
High Entropy

Nanoscale phase separation of TiZrNbTa high entropy alloy induced by hydrogen absorption

2020 ◽  
Vol 178 ◽  
pp. 503-507
Author(s):  
Cheng Zhang ◽  
Yuan Wu ◽  
Li You ◽  
Wenchong Qiu ◽  
Yin Zhang ◽  
...  
Keyword(s):  
Phase Separation ◽  
Hydrogen Absorption ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Nanoscale Phase Separation

Investigation on the activation mechanism of hydrogen absorption in TiZrNbTa high entropy alloy

2019 ◽  
Vol 781 ◽  
pp. 613-620 ◽  
Author(s):  
Cheng Zhang ◽  
Yuan Wu ◽  
Li You ◽  
Xingzhong Cao ◽  
Zhaoping Lu ◽  
...  
Keyword(s):  
Hydrogen Absorption ◽  
Activation Mechanism ◽  
High Entropy Alloy ◽  
High Entropy

Particle size effects on dislocation density, microstructure, and phase transformation for high-entropy alloy powders

Materialia ◽  
2021 ◽  
pp. 101161
Author(s):  
Sangho Jeon ◽  
Xuanjiang Liu ◽  
Colby Azersky ◽  
Jie Ren ◽  
Shengbiao Zhang ◽  
...  
Keyword(s):  
Particle Size ◽  
Phase Transformation ◽  
Dislocation Density ◽  
Size Effects ◽  
High Entropy Alloy ◽  
Particle Size Effects ◽  
High Entropy

scholarly journals Superior Hydrogen Sorption Kinetics of Ti0.20Zr0.20Hf0.20Nb0.40 High-Entropy Alloy

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 470
Author(s):  
Jianwei Zhang ◽  
Pengcheng Li ◽  
Gang Huang ◽  
Weiguang Zhang ◽  
Jutao Hu ◽  
...  
Keyword(s):  
Hydrogen Absorption ◽  
Xrd Analysis ◽  
Plateau Pressure ◽  
Absorption Capacity ◽  
High Entropy Alloy ◽  
Kinetic Properties ◽  
Desorption Kinetics ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Main Metal

High entropy alloys (HEAs) are composed of multiple main metal elements and have attracted wide attention in various fields. In this study, a novel Ti0.20Zr0.20Hf0.20Nb0.40 HEA was synthesized and its hydrogenation properties were studied, including sorption thermodynamics and hydrogen absorption/desorption kinetics. The maximum hydrogen absorption capacity was 1.5 H/atom at 573 K. X-ray diffraction (XRD) analysis indicated that the crystal structure of Ti0.20Zr0.20Hf0.20Nb0.40 HEA transformed from body-centered cubic (BCC) to body-centered tetragonal (BCT) with increasing hydrogen content, and to face-centered cubic (FCC) after hydrogen absorption to saturation. As a multi-principal element alloy, the Ti0.20Zr0.20Hf0.20Nb0.40 HEA possesses unique hydrogen absorption characteristics. The hydrogen absorption platform pressure rises gradually with the increase of the hydrogen absorption amount, which is caused by multiple kinds of BCT intermediate hydrides with consecutively increasing c/a. The full hydrogen absorption of the Ti0.20Zr0.20Hf0.20Nb0.40 HEA was completed in almost 50 s, which is faster than that of the reported hydrogen storage alloys in the literature. The experimental results demonstrate that the Ti0.20Zr0.20Hf0.20Nb0.40 HEA has excellent kinetic properties, unique thermodynamic hydrogen absorption performance, as well as a low plateau pressure at room temperature.

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