Phase equilibria in the Y–Hf–Fe system and hydrogen sorption properties of alloys

• Published in: Materials science (New York, N.Y.) Vol. 47; no. 6; pp. 822 - 829
• Main Authors: Levyts’kyi, V. О., Babizhets’kyi, V. S., M’yakush, О. R., Koval’chuk, I. V., Ryabov, О. B., Kotur, B. Ya
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-05-2012; Springer; Springer Nature B.V
• Subjects: Alloys; Analysis; Characterization and Evaluation of Materials; Chemistry and Materials Science; Crystal structure; Crystals; Diffraction; Equilibrium; Ferrous alloys; Hydrogen; Intermetallic compounds; Investigations; Laves phase; Materials Science; Phase equilibria; Radiation; Single crystals; Solid Mechanics; Solid solutions; Sorption; Structural Materials; Structure; Substitutional solid solutions; X-rays; crystal structure; metal hydrides; phase equilibria
• ISSN: 1068-820X; 1573-885X
• DOI: 10.1007/s11003-012-9461-6

We have investigated the interaction of the components in the ternary Y–Hf–Fe system by the methods of X-ray phase analysis, X-ray diffraction analysis, and energy-dispersive X-ray microanalysis and constructed an isothermal section of the constitution diagram at 800°С. The extents of substitutional solid solutions based on the binary compounds YFe
3
(Y
1−
x
Hf
x
Fe
3
, 0 ≤ 
x
 ≤ 0.2) and Y
2
Fe
17
(Y
2−
x
Hf
x
Fe
17
, 0 ≤ 
x
 ≤ 1.3) have been established. The crystal structure of the compound Hf
0.93
Fe
2
(the MgZn
2
structure type, space group
P
6
3
/mmc, Pearson symbol
hP
12,
a
 = 0.49440(7) nm, and
c
 = 0.8066(2) nm) has been refined for the first time by the single-crystal method. We have investigated the hydrogen sorption properties of Y
1−
x
Hf
x
Fe
2
alloys with the structure of the C15 Laves phase, Y
1−
x
Hf
x
Fe
3
alloys with the PuNi
3
-type structure, and (Hf
1−
x
Y
x
)
2
Fe alloys with the Ti
2
Ni -type structure.