Reinvestigation of Ni-solid solution/liquid equilibria in Ni-Al binary and Ni-Al-Zr ternary systems

Nucleation can play an important role during the formation of silicides, especially when the difference in Gibbs free energy ΔG between the existing and newly formed phase is small. In this work, it is shown that the addition of elements that form a solid solution with either the existing or nucleating phase influences the entropy of mixing and thus changes ΔG. In this way, the height of the nucleation barrier may be controlled, thus controlling the nucleation temperature. The influence of mixing entropy on silicide nucleation is illustrated by experiments for two ternary systems: Co–Mn–Si and Ni–Pd–Si. It is shown that the nucleation temperature of CoSi2 is increased by the addition of Mn, the nucleation temperature of MnSi1.7 is increased by the presence of Co, the nucleation temperature of NiSi2 is increased by the addition of Pd, and the nucleation temperature of PdSi is decreased by the addition of Ni. In all four cases, the effect of the alloying element on the nucleation temperature can be explained by a model on the basis of the concept of mixing entropy.

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Partially nonequilibrium solidification of solid-solution alloys in ternary systems

Steel in Translation ◽

10.3103/s0967091211030041 ◽

2011 ◽

Vol 41 (3) ◽

pp. 183-192

Author(s):

V. E. Bazhenov ◽

M. V. Pikunov

Keyword(s):

Solid Solution ◽

Ternary Systems ◽

Nonequilibrium Solidification

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Ternary Systems. XXIII. Solid Solution among the Picromerite Double Salts at 25°. The Zinc, Copper and Nickel Ammonium Sulfates

Journal of the American Chemical Society ◽

10.1021/ja01272a032 ◽

1938 ◽

Vol 60 (5) ◽

pp. 1099-1104 ◽

Cited By ~ 7

Author(s):

Arthur E. Hill ◽

William J. Taylor

Keyword(s):

Solid Solution ◽

Ternary Systems ◽

Double Salts

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Ambient Zinc K-Edge Extended X-Ray Absorption Fine Structure Studies on Solid Solution Hardening of the Ternary Alloys

ISRN Spectroscopy ◽

10.1155/2013/623409 ◽

2013 ◽

Vol 2013 ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Shabina Khan ◽

Javed Mazher ◽

Pankaja Singh

Keyword(s):

Solid Solution ◽

Bond Length ◽

Ternary Systems ◽

Ternary Alloys ◽

Solid Solution Hardening ◽

Solution Hardening ◽

X Ray ◽

Absorption Fine ◽

Multiple Paths ◽

X Ray Absorption

Solid solution hardening can be introduced in the zinc selenide by cationic substitution alloying. We are presenting our studies on gradual development of the hardening and the bond-length variations among the heavily Be-doped ternary alloys of . These compositionally vivid ternary systems are grown by the Bridgman technique, and a set of careful measurements of synchrotron-based Zn core X-ray absorption spectroscopy are performed on the mixed alloy, which is followed by extraction of useful oscillations of extended X-ray absorption fine structures. A detailed ab initio analysis is also carried out for the mixed alloy’s theoretical EXAFS simulations, and suitable data processing codes are used for the subsequent experimental spectra fittings. Various X-ray scattering single and multiple paths around the core atomic environ are simulated and compared with the spectroscopic results. With the aid of as-found parametric values, the hardening and crystalline disorders are discussed and explained in the midst of the multimodal bond-length behaviors and changes induced by the increased alloying amid as-found pseudocrystalline stabilities.

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