Microstructure and hydrogen storage properties of Sc-based laves phase alloys Sc0.8Zr0.1Y0.1Mn2-xNix(x=0~2.0)

doi:10.13373/j.cnki.cjrm.2015.08.004

	Microstructure and hydrogen storage properties of Sc-based laves phase alloys Sc0.8Zr0.1Y0.1Mn2-xNix(x=0~2.0)
	Wang, Wen 2; Luo, Yongchun 1,2; Qiu, Jianping 2; Kang, Long 2
刊名	Xiyou Jinshu/Chinese Journal of Rare Metals
	2015-08-01
卷号	39 期号:8 页码:696-704
关键词	Binary alloys Differential scanning calorimetry Hydrides Hydrogen storage alloys Kinetics Manganese Microstructure Nickel Rare earths Scandium alloys Scanning electron microscopy Vacuum applications Vacuum furnaces Element substitution Equilibrium pressure Hydrogen absorption Hydrogen desorption temperatures Hydrogen storage properties Hydrogen-absorption kinetics Laves phase alloys Pressure composition temperature
ISSN号	02587076
DOI	10.13373/j.cnki.cjrm.2015.08.004
英文摘要	Sc0.8Zr0.1Y0.1Mn2-xNix(x=0~2.0) AB2-type hydrogen storage alloys were prepared by vacuum arc furnace melting. The influences of Ni substitution for Mn on the microstructure and hydrogen storage properties of ScMn2-based alloys before and after the hydrogen absorption were investigated by X-ray diffraction (XRD) and scanning electron microscope/energy dispersive spectroscopy(SEM/EDS). Pressure-composition-temperature (P-C-T) curves and kinetics of hydrogen absorption were tested by Sievert type device and thermo gravimetric-differential scanning calorimetry (TG/DSC). The research results showed that the alloys were composed of Laves type main phase and minor ScNi phase and Y-rich phase as second phase. The rare earth elements Sc and Y could easily form intermetallic phase with Ni. With the increase of Ni content, the structure of Laves phase changed from C14 type to C15 type. Thereinto, the alloy structure was Laves single-phase of C14-type when the value of x was 0, while it was completely transformed into Laves single-phase of C15-type when the value of x was 2.0. Substitution of Mn by Ni had a significant effect on the kinetics of hydrogen absorption behavior and the equilibrium pressure of hydrogen absorbing P-C-T curve. As Ni content increased, the hydrogen absorption kinetics and activation performance of the alloys gradually deteriorated and hydrogen absorption storage capacity decreased, but the hydrogen desorption temperature was lowered significantly and the formation enthalpy of hydride reduced significantly (-35.05~-18.72 kJ·mol-1) and the equilibrium pressure of hydrogen absorbing P-C-T rose. Although the maximum hydrogen capacity reached 2.18%(mass fraction) at room temperature and the lattice expansion rate ΔV/V was 10.63%~27.32% after hydriding, the main phases of hydrides were still C14 type phase and C15 type phase and the phenomena of phase transition and non-crystallizing were not found. ©, 2015, Editorial Office of Chinese Journal of Rare Metals. All right reserved.
语种	中文
出版者	Editorial Office of Chinese Journal of Rare Metals
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112404]
专题	材料科学与工程学院
作者单位	1.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China 2.College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Wang, Wen,Luo, Yongchun,Qiu, Jianping,et al. Microstructure and hydrogen storage properties of Sc-based laves phase alloys Sc0.8Zr0.1Y0.1Mn2-xNix(x=0~2.0)[J]. Xiyou Jinshu/Chinese Journal of Rare Metals,2015,39(8):696-704.
APA	Wang, Wen,Luo, Yongchun,Qiu, Jianping,&Kang, Long.(2015).Microstructure and hydrogen storage properties of Sc-based laves phase alloys Sc0.8Zr0.1Y0.1Mn2-xNix(x=0~2.0).Xiyou Jinshu/Chinese Journal of Rare Metals,39(8),696-704.
MLA	Wang, Wen,et al."Microstructure and hydrogen storage properties of Sc-based laves phase alloys Sc0.8Zr0.1Y0.1Mn2-xNix(x=0~2.0)".Xiyou Jinshu/Chinese Journal of Rare Metals 39.8(2015):696-704.