Method for improving a property of an alloy

Details Method for improving a property of an alloy Method for improving a property of an alloy

1979-07-23

1981-02-10

Dean, R.

Metal treatment

Compositions

Heat treating

148 203, 148127, C21D 174, C22F 102

Patent

active

042499631

ABSTRACT:
A property, such as ductility, mechanical strength and increased remelt temperature, of an alloy, for example one which includes an element such as Si or B, or both, is improved by depletion of such an element through the alloy surface. This is accomplished by exposing the alloy surface, one common form of which is a brazing alloy, to gaseous ions such as fluoride ions, while heating the alloy at a temperature which is not detrimental to the alloy or members associated with the alloy. Heating is conducted for a time sufficient for such elements, for example those selected from Si and B, included as a melting point depressant, to diffuse to the surface of the alloy and to react with the gaseous ions to form a gaseous compound of the element. Such gaseous compound then separates from the surface, thereby depleting the alloy of the element and improving at least one property.

REFERENCES:
patent: 3215566 (1965-11-01), Mayer
patent: 3859145 (1975-01-01), McGlasson et al.
patent: 4098450 (1978-07-01), Keller et al.

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