材料科学
脱氢
金属间化合物
燃烧
反应性(心理学)
合金
动力学
氢
氢化物
化学工程
工作(物理)
氢气储存
化学动力学
反应机理
镁
活化能
原材料
冶金
热力学
氧化还原
热化学
氢化镁
作者
Shiyu Zhang,Yanli Zhu,Wanjun Zhao,Zhigang Liu,Ziting Wei,Wei Le,Qingjie Jiao
标识
DOI:10.1002/adfm.202515686
摘要
Abstract Magnesium‐based alloy fuels and magnesium hydride (MgH 2 ) are promising candidates for fuels with high reactivity attracted numerous interests in energetic field. In this work, MgH 2 with both high combustion heat and reactivity is introduced into Magnesium‐Aluminum (Mg‐Al) alloys through solid‐state hydrogen storage technology, which achieves a well assembly of Mg, Al, and MgH 2 on a micro scale. The hydrogenation of Mg‐Al alloys is a surface‐to‐inside process, in which hydorgen (H 2 ) is sequentially complexed with α‐Mg, Al 12 Mg 17 , and Al 3 Mg 2 . Higher content of Mg and richer metallurgical interfaces in Mg‐Al alloys can contribute to a higher hydrogenation degree. In addition, distinguished from Mg‐Al alloys, the oxidization of hydrogenated Mg‐Al alloys is triggered by the dehydrogenation and oxidation of MgH 2 at ≈300 °C and 440 °C, promoting further oxidation of the internal Mg‐Al intermetallic compound and advancing the oxidation temperature ≈10–20 °C. The multi‐spectral combustion diagnostic technique further illustrates hydrogenated Mg‐Al alloys show 200–400 °C higher combustion flame temperature than raw materials, which can be ascribed to the positive feedback combustion mechanism of “combustion‐reduction‐combustion” that promotes the energetic kinetics of Mg‐Al alloy hydrides. Therefore, hydrogenated Mg‐Al alloys in this work show tremendous potential as high‐performance reactive fuels in energetic materials.
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