Dual-tuning effects of In, Al, and Ti on the thermodynamics and kinetics of Mg85In5Al5Ti5 alloy synthesized by plasma milling
Dual-tuning effects of In, Al, and Ti on the thermodynamics and kinetics of Mg85In5Al5Ti5 alloy synthesized by plasma milling
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In、Al、Ti对等离子铣削合成Mg85In5Al5Ti5合金热力学和动力学的双调节效应
DOI：
10.1016/j.jallcom.2014.10.200
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发表时间：
2015-02-25
影响因子：
6.2
通讯作者：
Zhu, Min
中科院分区：
文献类型：
--
作者：
Cao, Zhijie;Ouyang, Liuzhang;Zhu, Min
MgH 2通过可逆形成Mg0.95In0.05固溶体的脱氢焓变为调节镁基合金的热力学提供了一种新的方法。为了进一步降低MgH_2的稳定性，在Mg（In）固溶体中引入Al。同时，为了解决Mg-In固溶体动力学性能滞后的问题，降低脱氢活化能，还添加了Ti。研究表明，等离子球磨（P-milling）制备的Mg_（85）In_5Al_5 Ti_5合金具有较好的放氢热力学和动力学性能。该方法可以一步合成含Ti催化剂的Mg（In，Al）三元固溶体，比两步合成法更有效。与Mg基固溶体相比，Ti和原位合成MgF 2的加入改善了Mg 85 In 5Al 5 Ti 5体系的动力学性能，In和Al的引入增强了Mg 85 In 5Al 5 Ti 5体系的热力学性能。Mg_（85）In_5Al_5 Ti_5合金的放氢焓变和活化能分别降低到65.2 kJ/（mol H-2）和125.2 kJ/mol。(C)2014爱思唯尔有限公司版权所有。
The dehydrogenation enthalpy change of MgH2 by reversibly forming an Mg0.95In0.05 solid solution offers a new method for tuning the thermodynamics of Mg-based alloys. In order to further lower the stability of MgH2, Al has been introduced into Mg(In) solid solution. At the same time, to solve the problem of sluggish kinetic properties of Mg-In solid-solution systems and to lower the dehydrogenation activation energy, Ti has also been added. It has been demonstrated that the Mg85In5Al5Ti5 alloy synthesized by plasma milling (P-milling) shows both enhanced dehydriding thermodynamics and kinetics. This technique could be used to synthesize Mg(In, Al) ternary solid solution incorporating the Ti catalyst in only one step, making it much more efficient than the two-step method. Compared with Mg-based solid solutions, the addition of Ti and in-situ synthesized MgF2 improved the kinetics and the introduction of In as well as Al imparted enhanced thermodynamics to the Mg85In5Al5Ti5 system. The dehydrogenation enthalpy change and activation energy were lowered to 65.2 kJ/(mol H-2) and 125.2 kJ/mol, respectively, for the Mg85In5Al5Ti5 alloy. (C) 2014 Elsevier B.V. All rights reserved.