Effects of ball milling time on the microstructure and hydrogen storage performances of Ti21.7Y0.3Fe16Mn3Cr alloy |
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| Affiliation: | 1. Instrumental Analysis Center, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;1. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;2. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;3. Beijing Key Laboratory of Precision Alloys, Beijing 100081, China;1. Instrumental Analysis Center, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;1. Research Center for New Energy Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. North University of China, Taiyuan 030051, PR China;1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;3. Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;1. Center for Energy Materials Research, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea;2. Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea;3. Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul, 01811, Republic of Korea |
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| Abstract: | TiFe alloy can store hydrogen at room temperature and low hydrogen pressure, and its theoretical hydrogen storage capacity is up to 1.8 wt%. However, TiFe alloy needs to be activated at high pressure (5 MPa hydrogen) and high temperature (673–723 K), which limits the practical application of TiFe alloy. The as-cast Ti21.7Y0.3Fe16Mn3Cr alloy was milled for 0, 0.5, 0.75, 1, and 3 h to study the effects of ball milling on phase structures and hydrogen storage performances. Emphasis was focused on the activation process of as-milled alloys at different temperatures, including the activation process at 483, 443, and 403 K. The results show that the alloys were consisted of TiFe phase, and Fe, Cr] solid solution. The nanocrystalline boundary produced by milling and the phase boundary provided by the second phase provide a large number of channels for hydrogen diffusion and promote the improvement of hydrogen storage performances. The time required for activation process of as-milled alloys was significantly reduced, and the activation time of as-milled (0.75 h) was only 4 min, and its enthalpy variation for hydrogen absorption and desorption was 22.943 and 26.215 kJ mol−1 H2, respectively. |
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| Keywords: | AB-type alloy Ball milling Activation temperature Thermodynamics Hydrogenation capacity |
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