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Phases with narrow compositional ranges

The phase distribution observed in the alloys deposited from AlCb-NaCl is very similar to that of Mn-Al alloys electrodeposited from the same chloroaluminate melt [126 129], Such similarity may also be found between the phase structure of Cr-Al and Mn-Al alloys produced by rapid solidification from the liquid [7, 124], These observations are coincident with the resemblance of the phase diagrams for Cr-Al and Mn-Al, which contain several intermetallic compounds with narrow compositional ranges [20], inhibition of the nucleation and growth of ordered, often low symmetry, intermetallic structures is commonly observed in non-equilibrium processing. Phase evolution is the result of a balance between the interface velocity and... [Pg.312]

MOt 78. A distinct phase of relatively narrow composition range occurs as Pr0178. The splitting of the strong lines in the powder pattern can be accounted for in terms of a face-centered rhombohedral unit cell. The true unit cell for this phase is not known. Bevan (3) reports a rhomobohedral phase of narrow composition range at this stoichiometry (y phase). It was indexed with a hexagonal unit cell. [Pg.56]

This solid solution is metastable with respect to various ordered phases (microphases observed in narrower composition ranges. [Pg.172]

At lower temperatures, the a phase transforms through a disorder-order process into a series of ordered, fluorite-related phases which can be described with the generic formula CenO n jm- These mixed-valent compounds have compositions between CeO[ 7,4 (Ce70,2. n=7, m=I) and Ce02. The seemingly continuous variation of X at low temperatures is due to the co-existence of two phases with different stoichiometries (n, n-t D. Pure Ce 02 .2mi in contrast, exists only in a narrow composition range. [Pg.27]

Zirconium hydride is not a tme compound of fixed stoichiometry but rather a series of crystalline phases through which zirconium metal transforms with changing hydrogen concentration and temperature. The y-phase hydride exists below 250°C in the narrow composition range ZrH.Qg to ZrH the 5-phase has a compositional range Zftl to ZrH and the S-phase has a compositional range ZrH g—Z1H2. Most commercial hydride powder contains 5- and S-phase. [Pg.433]

The DGEBA/DDM/ESR phase inversion proceeds in a narrow composition range. Formation of larger particles and transitional states with bimodal particle-size distribution found in the other three formulations have not been observed for DGEBA/DDM/ESR(x). [Pg.111]

Buschow, 1980). The crystallographic data of most binary, ternary, and quaternary rare earth phases have been compiled (Gladyshevskii and Bodak, 1982). The rare earth intermetallics are mostly line compounds and have only very narrow composition ranges. Preparation of the phases is difficult because of the high affinity of the rare earths for oxygen, which leads to reactions with common crucible materials, and various processes have been developed for the preparation of the intermetallic rare earth phases (Herget and Domazer, 1975). [Pg.108]


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See also in sourсe #XX -- [ Pg.3 , Pg.5 , Pg.6 , Pg.10 ]




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