Mg（In）固溶体的微观结构与储氢性能.pdf

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1、第24卷第6期中国有色金属学报2014年6月Volume24Number6TheChineseJournalofNonferrousMetalsJune2014文章编号：1004-0609(2014)06-1486-08Mg(In)~溶体的微观结构与储氢性能钟海长，王辉(1．厦门理工学院材料科学与工程学院，厦门361024；2．华南理工大学材料科学与工程学院，广州510640)摘要：采用烧结一球磨方法制备了不同成分的Mg(In)固溶体合金。利用x射线衍射分析合金的相组成和吸／脱氢过程的相转变，并用Rietveld方法精确测定Mg(In)固溶体的晶格常数；

2、通过SEM观察样品的微观形貌及其相分布；吸／脱氢性能采用Sievert方法进行测试，并用差热分析准确测定合金的脱氢温度。结果表明：In固溶到Mg品格中使Mg的晶格常数减小；Mg(In)固溶体氢化分解成MgH2和金属间化合物Mg~Iny，脱氢后可逆地回到Mg(In)固溶体。Mg(In)固溶体吸／脱氢可逆相变与界面合金化有效降低了合金的脱氢反应焓，从而降低了合金脱氢温度，并提高了合金的吸／脱氢动力学性能。与纯Mg相比，Mg(In)固溶体的吸／脱氢平台压提高，吸／脱氢滞后减小。关键词：Mg(In)固溶体；可逆相变；界面合金化；微观结构；储氢性能中图分类号：TG

3、139．7文献标志码：AMicrostructureandhydrogenstoragepropertiesofMg(In)solidsolutionZHONGHai．chang，WANGHui(1．SchoolofMaterialsScienceandEngineering，XiamenUniversityofTechnology，Xiamen361024，China；2．SchoolofMaterialsScienceandEngineering，SouthChinaUniversityofTechnology,Guangzhou510640，Chi

4、na)Abstract：Mg(In)solidsolutionswithdiferentcompositionswerepreparedbysinteringandballmillingmethod．X·raydifractionwasusedtoanalyzethephasesandphasetransitionofthealloysduringthehydridinganddehydridingprocessLatticeconstantsofMg(In)solidsolutionwereaccuratelycalculatedbyRietveldm

5、ethod．MorphologyandphasedistributionofthesampleswereobservedbySEM．ThehydrogenabsorptionanddesorptionperformancesofthealloysweremeasuredbySievenmethod，anddehydridingtemperaturesweredeterminedbyDSCtests．TheresultsshowthatthelatticeconstantsofMgarereducedbydissolvingofIn，andthatMg(I

6、n)solidsolutionswerehydrogenatedtoMgH2andintermetalliccompoundsMgxlny，whichreversiblyreturntoMg(In)solidsolutionafterdehydrogenmion．ThereversiblehydridinganddehydridingphasetransitionsofMg(In)solidsolutionsandinterfacialalloyingefectivelyreducethedehydridingenthalpy,thusloweringt

7、hedehydridingtemperatureandimprovingthehydridinganddehydridingkineticsoftheMg(In)solidsolutions．TheplateaupressureofMg(In)solidsolutionsisimprovedandthehydridinganddehydridinglagisreducedcomparedwiththoseofpureMg．Keywords：Mg(In)solidsolution；reversiblephasetransition；interfaciala

8、lloying；microstructure；hydrogenstoragepr