Phase transformation and thermal analysis during combustion synthesis of Mg17Al12 alloy
Phase transformation and thermal analysis during combustion synthesis of Mg17Al12 alloy
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DOI：
10.1007/s12598-013-0192-0
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发表时间：
2014-02
期刊：
影响因子：
8.8
通讯作者：
Yuli Zhou;Yun Lu;Yunfeng Zhu;Liquan Li
中科院分区：
文献类型：
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作者：
Yuli Zhou;Yun Lu;Yunfeng Zhu;Liquan Li
采用燃烧合成（CS）法成功制备了Mg-Al储氢合金。利用 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和差示扫描量热法 (DSC) 研究了 CS 过程中合金相的形成。当时间在 733 K 下从 0、0.5、1.0 增加到 2.0 h 时，产物为 Mg 和 Al； Mg2Al3、镁和铝； Mg17Al12、Mg2Al3；和镁；最终分别只有 Mg17Al12。结合DSC迹线中的三个峰，得出CS过程中Mg17Al12的形成包括三个过程，即首先形成Mg2Al3；然后是不饱和固溶体，Mg17Al12；最后是完整的 Mg17Al12 合金。本工作中 Mg17Al12 之前 Mg2Al3 的形成与机械合金化制备的 Mg2Al3 不同。这被认为与CS热爆炸时的瞬间高温有关。
The Mg–Al hydrogen storage alloy was successfully prepared by combustion synthesis (CS) method. The formation of alloy phases during the CS process was studied using X-ray diffraction (XRD), scanning electron microscope (SEM), and differential scanning calorimetry (DSC). When the time increases from 0, 0.5, 1.0 to 2.0 h at 733 K, the products are Mg and Al; Mg2Al3, Mg and Al; Mg17Al12, Mg2Al3; and Mg; and eventually only Mg17Al12, respectively. Combined with three peaks in the DSC traces, it is concluded that the formation of Mg17Al12during the CS includes three processes, namely, the formation of Mg2Al3first; then the unsaturated solid solution, Mg17Al12; and finally the complete Mg17Al12alloy. The formation of Mg2Al3prior to Mg17Al12in this work is different from those prepared by mechanical alloying. This is thought to be related to the instant high temperature during the thermal explosion of CS.