(1. 廈門理工學(xué)院 材料科學(xué)與工程學(xué)院，廈門 361024；
2. 華南理工大學(xué) 材料科學(xué)與工程學(xué)院，廣州 510640)
摘 要: 采用燒結(jié)-球磨方法制備了不同成分的Mg(In)固溶體合金。利用X射線衍射分析合金的相組成和吸/脫氫過程的相轉(zhuǎn)變，并用Rietveld方法精確測(cè)定Mg(In)固溶體的晶格常數(shù)；通過SEM觀察樣品的微觀形貌及其相分布；吸/脫氫性能采用Sievert方法進(jìn)行測(cè)試，并用差熱分析準(zhǔn)確測(cè)定合金的脫氫溫度。結(jié)果表明：In固溶到Mg晶格中使Mg的晶格常數(shù)減小；Mg(In)固溶體氫化分解成MgH2和金屬間化合物MgxIny，脫氫后可逆地回到Mg(In)固溶體。Mg(In)固溶體吸/脫氫可逆相變與界面合金化有效降低了合金的脫氫反應(yīng)焓，從而降低了合金脫氫溫度，并提高了合金的吸/脫氫動(dòng)力學(xué)性能。與純Mg相比，Mg(In)固溶體的吸/脫氫平臺(tái)壓提高，吸/脫氫滯后減小。
關(guān)鍵字: Mg(In)固溶體；可逆相變；界面合金化；微觀結(jié)構(gòu)；儲(chǔ)氫性能
（1. School of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, China;
2. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China）
Abstract:Mg(In) solid solutions with different compositions were prepared by sintering and ball milling method. X-ray diffraction was used to analyze the phases and phase transition of the alloys during the hydriding and dehydriding process. Lattice constants of Mg(In) solid solution were accurately calculated by Rietveld method. Morphology and phase distribution of the samples were observed by SEM. The hydrogen absorption and desorption performances of the alloys were measured by Sievert method, and dehydriding temperatures were determined by DSC tests. The results show that the lattice constants of Mg are reduced by dissolving of In, and that Mg(In) solid solutions were hydrogenated to MgH2 and intermetallic compounds MgxIny, which reversibly return to Mg(In) solid solution after dehydrogenation. The reversible hydriding and dehydriding phase transitions of Mg(In) solid solutions and interfacial alloying effectively reduce the dehydriding enthalpy, thus lowering the dehydriding temperature and improving the hydriding and dehydriding kinetics of the Mg(In) solid solutions. The plateau pressure of Mg(In) solid solutions is improved and the hydriding and dehydriding lag is reduced compared with those of pure Mg.
Key words: Mg(In) solid solution; reversible phase transition; interfacial alloying; microstructure; hydrogen storage property
