TY - JOUR
T1 - Solid state reaction and formation of nano-phase composite hydrogen storage alloy by mechanical alloying of MmNi3.5(CoMnAl)1.5 and Mg
AU - Gao, Y.
AU - Zeng, M. Q.
AU - Li, B. L.
AU - Zhu, M.
AU - Chung, C. Y.
PY - 2003/6/1
Y1 - 2003/6/1
N2 - In this work MmNi3.5(CoMnAl)1.6 and Mg were mechanically alloyed to prepare composite hydrogen storage alloys. The microstructural variation of the alloy resulted from the mechanical alloying was characterized by X-ray diffraction, SEM and TEM analysis. It was found that solid state reaction occurred between MmNi3.5(CoMnAl)1.5 and Mg components, resulting in Mm2Mg17 phase formation. The alloy obtained by ball milling contains homogeneously distributed Mg, MmNi3.5(CoMnAl)1.5 and Mm2Mg17 phases of nanometer size. It was also found that Mg2Ni was formed after the mechanically alloyed samples were annealed. The mechanism of the reaction has been proposed based on the estimation of the heat of formation using Miedema's theory and is in accordance with the experiment result of lattice constant measurement of ball milled sample and its structure variation during annealing. © 2003 Kluwer Academic Publishers.
AB - In this work MmNi3.5(CoMnAl)1.6 and Mg were mechanically alloyed to prepare composite hydrogen storage alloys. The microstructural variation of the alloy resulted from the mechanical alloying was characterized by X-ray diffraction, SEM and TEM analysis. It was found that solid state reaction occurred between MmNi3.5(CoMnAl)1.5 and Mg components, resulting in Mm2Mg17 phase formation. The alloy obtained by ball milling contains homogeneously distributed Mg, MmNi3.5(CoMnAl)1.5 and Mm2Mg17 phases of nanometer size. It was also found that Mg2Ni was formed after the mechanically alloyed samples were annealed. The mechanism of the reaction has been proposed based on the estimation of the heat of formation using Miedema's theory and is in accordance with the experiment result of lattice constant measurement of ball milled sample and its structure variation during annealing. © 2003 Kluwer Academic Publishers.
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U2 - 10.1023/A:1023921605728
DO - 10.1023/A:1023921605728
M3 - RGC 21 - Publication in refereed journal
SN - 0022-2461
VL - 38
SP - 2499
EP - 2504
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 11
ER -
