Process for obtaining crystals of intermetallic compounds, in pa

Details Process for obtaining crystals of intermetallic compounds, in pa Process for obtaining crystals of intermetallic compounds, in pa

1987-10-22

1989-06-13

Doll, John

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156DIG61, 156DIG76, 156DIG71, 156DIG104, 148 13, 148 132, 420400, 420529, C30B 2952

Patent

active

048389889

ABSTRACT:
The invention relates to a process for obtaining crystals of intermetallic compounds, in particular isolated monocrystals, by cooling alloys in the molten state.
The process involves using an alloy in the molten state which has a composition such that the first phase to crystallize during its solidification corresponds to the compound to be isolated, cooling it slowly by subjecting it to cyclic stirring and thermal cycling without attaining the temperature at which another solid phase appears then abruptly expelling the residual liquid.
The process is used for obtaining large monophase primary crystals of compounds which melt congruently or incongruently, in particular compounds having symmetry of order 5 known as "quasi-crystals".

REFERENCES:
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patent: 3729348 (1973-04-01), Saul
patent: 3936298 (1976-02-01), Mehrabian et al.
patent: 3954455 (1976-05-01), Flemings et al.
patent: 3981764 (1976-09-01), Ito et al.
patent: 4013501 (1977-03-01), Van Vitert et al.
Hardy et al., "The Phase Sections at 500.degree. and 350.degree. C. of Aluminum-Rich Aluminum-Copper-Lithium Alloys", J. Inst. Met., vol. 24, pp. 423-428, (1955).
Sainfort et al., "Metallurgy-`Quasicrystalline` Precipitation from Solid Solutions of the Al-Li-Cu-Mg System", C. R. Acad. Sc. Paris, vol. 301, Series II, pp. 689-690, (1985).
Lyman et al., "Metals Handbook", vol. 1, 8th Ed., American Society for Metals, Ohio, pp. 1, 21.

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