Carlo Adamoli
Nickel-Beryllium alloy

Pagina 4

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The resulting solid solution shows interpositions between a grain and the other, namely small layers or small grains of a distinct constituent, and what-ever may be made, either when the heating before quenching is protracted or when one at-tempts to increase the temperature of the said heating (a thing which is extremely dangerous), one does not succeed in causing the said heterogeneous interpositions between a grain and the other to disappear. The scission of the super-saturated solid solution will take place, according to the known principle of Le Chàtelier, certainly preferably in the places where such localized heterogeneousnesses exist and the hardening constituent will form in excessive dimensions in these intergranular spaces. Thus, one will have a hardened alloy, but an alloy in which the individual grains are not well bound together; accordingly, the alloy even then when it shows some mechanical characteristic of interest will not meet the optimum characteristic conditions, nor will it show a practically homogeneous structure. Such a structure may be compared with a masonry structure containing blocks having a resistance attaining 1,000 kilogs. per square decimetre, but bound together by a mortar the resistance of which does not exceed 200 kilogs. per square decimeter. The individual blocks have a good resistance, but the whole is structurally weak.       Now, after long studies which have been niade with respect to the better conditions of formation and scission of the fundamental solid solution of the Be-Ni alloys, I have succeeded not only in precising the phenomenon under a novel point of view, but also in disceverine a novel and rational method for improving the physico-chemico-mechanical properties of the Be-Ni alloys.

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