淬火对Mg_5Al_3Li_2合金储氢性能的影响

Influence of quenching on hydrogen storage performance of Mg_5Al_3Li_2 alloy

在氩气保护下,采用粉末烧结后液氮快速淬火处理并结合机械合金化工艺方法制备Mg_5Al_3Li_2合金,对样品材料的组织、吸放氢动力学以及热性质进行了研究。结果表明,采用烧结后液氮快速淬火处理工艺虽然未能改善Mg_5Al_3Li_2合金的氢化和脱氢动力学性能,使合金材料氢化物的脱氢温度以及脱氢激活能分别提高了15.1 K和14.5 k J/mol,但其氢化量随着温度的升高而增大。因此,下一步工作应优先考虑采用先球磨后烧结、SPS放电等离子烧结+球磨或高能球磨等另一制备工艺来提高Mg-Al-Li合金材料的储氢性能。

Mg-Al-Li alloy were prepared by using liquid nitrogen rapid quenching process after powder sintering method and mechanical alloying under the argon atmosphere protection,and microstructure,hydrogen absorption and desorption kinetics and thermal properties were investigated. The results show that the liquid nitrogen rapid quenching process after sintering are not obviously improve Mg_5Al_3Li_2 hydrogen absorption and desorption kinetics performance of the alloy,especially the dehydrogenation temperature of liquid nitrogen quenching samples hydride and dehydrogenation activation energy raise 15. 1 K and 14. 5 k J / mol respectively,but the hydrogenated quantity increases with the increase of temperature. Therefore,the next step of work at first should be considered that using ball mill before sintering,SPS discharge plasma sintering ＋ ball mill or high energy ball mill another preparation technology to increase the Mg-Al-Li alloy of hydrogen storage properties.