Results 111 to 120 of about 2,333 (165)

Laves phase formation in solids

Journal of Materials Science, 1994
Structural changes of the Fe-Mo, Fe-Ti and Fe-Nb binary alloys have been investigated by means of electron microscopy and X-ray diffraction. A tweed structure representing modulation of the composition always precedes the Laves phase precipitation. The latter fact allows confirmation that the Laves phase precipitation proceeds by the spinodal mechanism.
Y. Ustinovshikov, Chen Shiren, M. Shirobokova   +2 more
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Laves-phase superalloys?

Physica Status Solidi (a), 1992
The mechanical properties of Laves phases, and of alloys containing Laves phases, are reviewed with an eye to their potential as high-temperature structural materials. Several two-phase alloys show promising combinations of high-temperature strength and low-temperature toughness, and extensive room-temperature deformability of the cubic Laves phase by ...
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Deformation and Defects in Laves Phases

MRS Proceedings, 1988
ABSTRACTPrototype Laves Phases MgCu2 and MgZn2 have been deformed in compression at various temperatures and strain rates, and dislocations produced by deformation have been characterized by TEM. Ternary cubic Laves phases Mg(Cu,M)2, where M-Al, Ni, Si, and Zn, have also been deformed, and substantial solution hardening was ...
J. D. Livingston, E. L. Hall, E. F. Koch
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Laves phases of actinide elements

Journal of Nuclear Materials, 1972
Abstract The crystal structure and lattice constants of eight new neptunium Laves phases and three new americium Laves phases are reported. The results, together with the previously published data, are discussed in terms of atomic size and electronic effects. The occurrence of lanthanide and actinide Laves phases is also summarized and compared.
D.J. Lam, A.W. Mitchell
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Madelung Constants of the Superlattices of the Laves Phases

Crystal Research and Technology, 1988
AbstractThe Madelung constants of all possible superlattices of the Laves phases are calculated using a modified form of the Ewald‐Fuchs method.
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Polytypic transformations in Laves phases

Intermetallics, 2004
Abstract The Cr2X (X=Ti, Zr, Hf, Nb or Ta) Laves phases have the hexagonal (2H or 4H) structure at high temperatures and the cubic (3C) structure at room temperature. Their compositional ranges are dictated by their e/a ratios. Experimental observations of two-phase alloys in several of these systems demonstrate that the hexagonal structure is often ...
K.S. Kumar, P.M. Hazzledine
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Stable high-entropy TiZrHfNbVCrMoMnFeCoNiAl Laves phase

Scripta Materialia, 2020
Abstract Recent researches in the field of high-entropy materials reveal an intriguing result: the multi-component systems combining the chemical elements with diverse valencies and radii can form single-phase solid solutions with the structure of intermetallic Laves phases.
S.A. Uporov, R.E. Ryltsev, S.Kh. Estemirova, E.V. Sterkhov, N.M. Chtchelkatchev   +4 more
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Phase Stability in Transition-Metal Laves Phases

Physical Review Letters, 1976
We report a successful first-principles calculation of the correlation between crystal structure and $d$-electron-to-atom ratio in the transition-metal Laves alloys. The existence of a Hume-Rothery-type rule is related to geometrical similarities of the structures.
R. L. Johannes, R. Haydock, Volker Heine
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Amorphization of RFe2 Laves Phases by Hydrogen Absorption

Materials Science and Engineering, 1988
Abstract By hydrogenation of Laves phase RFe 2 compounds (where R is yttrium, samarium, gadolinium, terbium, dysprosium, holmium or erbium) between 450 and 550 K, we demonstrate that it is possible to produce the amorphous alloys containing hydrogen.
K. Aoki, A. Yanagitani, X.-G. Li, T. Masumoto   +3 more
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Refractory and Silicide Laves Phases

MRS Proceedings, 1993
AbstractPresent knowledge and understanding of deformation mechanisms, mechanical properties, and dislocations in Laves phases are reviewed. Although the amount of study applied to alloys containing these compounds has been relatively limited, several systems with promising high-temperature properties have been identified, including alloys hardened by ...
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