肖学章, 陈立新, 刘广成, et al. Microstructures and Hydrogen Storage Characteristics of Nanocrystal/Amorphous Mg17Al12 Alloy Prepared by Ball-Milling[J]. 2007, 41(11): 1368-1372.
肖学章, 陈立新, 刘广成, et al. Microstructures and Hydrogen Storage Characteristics of Nanocrystal/Amorphous Mg17Al12 Alloy Prepared by Ball-Milling[J]. 2007, 41(11): 1368-1372.DOI:
hydrogen storage alloy was prepared by ball-milling with Mg and Al powders as raw materials. The influence of milling time on the microstructure and hydrogen storage characteristic of the alloy was investigated. The results show that the phase structure and hydrogen storage characteristic of the Mg
17
Al
12
alloy are affected greatly by the milling
time. As the milling time(t)increases the average particle size of the sample decreases first and then increases
the alloy phase structure evolves from crystalline(t≤50 h)to nanocrystal(t=70 h)
and then to amorphous(t=100 h). The maximum hydrogen storage capacities of the Mg
17
Al
12
alloy ball-milled for 30 h
70 h and 100 h are 4.03%
4.27% and 4.18% at 350 ℃
respectively. The hydrogen storage capacities of the nanocrystal Mg
17
Al
12
(t=70 h)alloy are 1.07% at 200 ℃
3.02% at 280 ℃
and 4.07% at 320 ℃
respectively. The hydrogen capacities of the Mg
17
Al
12
amorphous alloy(t=100 h)is 2.84% absorbed in 30 min at 200 ℃
which is 2.7 times that of nanocrystal alloy and 5.1 times that of as-cast alloy.