Making amorphous and crystalline alloys by solid state interdiff

Details Making amorphous and crystalline alloys by solid state interdiff Making amorphous and crystalline alloys by solid state interdiff

1991-07-22

1993-03-30

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Surface melting

148561, 228193, C22C 100, C22C 3300

Patent

active

051980436

ABSTRACT:
Methods for synthesizing solid-state crystalline alloys and products made therefrom are disclosed. Plural repeat units, each comprising an ordered sequence of superposed layers of preselected solid-state reactants, are formed superposedly on a surface of a solid substrate to form a modulated composite of the reactants. The layers comprising a repeat unit are controllably formed to have relative thicknesses corresponding to the stoichiometry of a preselected solid compound found on a phase diagram of the reactants. Each repeat unit also has a repeat-unit thickness no greater than a critical thickness for a diffusion couple of the reactants, where the repeat-unit thickness is preferably less than or equal to about 100 .ANG.. The modulated composite is then heated to an interdiffusion temperature lower than a nucleation temperature for the reactants for a time sufficient to form an amorphous alloy of the reactants having a stoichiometry corresponding to the preselected solid compound. The amorphous alloy is then heated to a nucleation temperature to initiate crystallization of the alloy. The methods described herein allow control of the outcome of a solid-state synthesis pathway in part by controlling which intermediate(s) are formed.

REFERENCES:
patent: 4710235 (1987-12-01), Scruggs
patent: 4830262 (1989-05-01), Ishibe
Cotts, et al., "Calorimetric Study of Amorphization in Planar, Binary, Multilayer, Thin-Film Diffusion Couples of Ni and Zr," Phys. Rev. Lett. 57:2295-2298 (1986).
Gosele and Tu, "'Critical Thickness' of Amorphous Phase Formation in Binary Diffusion Couples," J. Appl. Phys., 66:2619-2626 (1989).
Novet and Johnson, "New Synthetic Approach to Extended Solids: Selective Synthesis of Iron Silicides via the Amorphous State," J. Am. Chem. Soc. 113:3398-3403 (1991).

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