Effect of heat treatment on hydrogen storage properties and thermal
stability of V68Ti20Cr12 alloy |
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| Authors: | Maohua Rong Feng Wang Jiang Wang Zhongmin Wang and Huaiying Zhou |
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| Institution: | School of Materials Science and Engineering & Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin
541004, China,School of Materials Science and Engineering, Beihang University, Beijing 100191, China,School of Materials Science and Engineering & Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin
541004, China,School of Materials Science and Engineering & Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin
541004, China and School of Materials Science and Engineering & Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin
541004, China |
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| Abstract: | Effect of heat treatment on the crystal structure, microstructure, hydrogen storage properties and thermal
stability of V68Ti20Cr12 alloy prepared by arc-melting was studied in this work. It was found that both the as-cast
and annealed (973 K/72 h) V68Ti20Cr12 alloys consisted of a single body-centered cubic (bcc) phase. After heat
treatment, the hydrogen absorption/desorption kinetic characteristics of the as-cast alloy was improved greatly
due to the homogeneous composition and perfect structure. The mechanism of hydrogen absorption/desorption
process in the as-cast and annealed alloys was further investigated according to the Johnson-Mehl-Avrami
(JMA) equation. The hydrogen absorption process of the as-cast and annealed alloys would be controlled by the
one-dimensional diffusion process, while the hydrogen desorption process in the as-cast and annealed alloys
was dominated by the geometrical contraction model. The pressure-composition-temperature (PCT) measurements
show that the plateau pressure of the annealed alloy becomes comparatively flat. Furthermore, the
activation energies of the dehydrogenation in the as-cast and annealed alloys were calculated using the Kissinger
method, indicating that heat treatment is a very beneficial way to improve hydrogen absorption/desorption
kinetics of the alloy. |
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| Keywords: | V-Ti-Cr alloys
Hydrogen storage properties
Thermal stability
Heat treatment |
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