CAJ | 학술논문

采用烧结-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；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晶格中使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MgxIny，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。
채용소결-구마방법제비료불동성분적Mg(In)고용체합금。이용X사선연사분석합금적상조성화흡/탈경과정적상전변，병용Rietveld방법정학측정Mg(In)고용체적정격상수；통과SEM관찰양품적미관형모급기상분포；흡/탈경성능채용 Sievert 방법진행측시，병용차열분석준학측정합금적탈경온도。결과표명：In 고용도 Mg정격중사Mg적정격상수감소；Mg(In)고용체경화분해성MgH2화금속간화합물MgxIny，탈경후가역지회도Mg(In)고용체。Mg(In)고용체흡/탈경가역상변여계면합금화유효강저료합금적탈경반응함，종이강저료합금탈경온도，병제고료합금적흡/탈경동역학성능。여순Mg상비，Mg(In)고용체적흡/탈경평태압제고，흡/탈경체후감소。
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.