Carlo Adamoli
Nickel-Beryllium alloy

Pagina 9

[Indice]

Berryllium alloys - as for instance nickel-beryllium alloys - have already been manufactured and used for the manufacture of springs, needles or other very fine objects, but it has not been possible, on account of the delicacy of these articles, to avoid the risk of causing "burning" of the alloy during the heating before quenching. In the same way nickel-beryllium alloys have been manufactured with the addition, in a high proportion, of another metal such as titanium, but the beryllium and titanium contents were very considerable and on account of this fact these alloys were very costly and very oxidisable and also brittle. Titanium, being in fact, in all the known alloys, used as a partial replacement of beryllium, is always in excess of the quantity which is necessary for the use here under consideration, and the excess of titanium has a prejudicial effect which is entirely different from the effect of the solubilizing metal used according to the invention.       One the contrary, the present invention allows of obtaining alloys which, while containing only comparatively very small proportions of beryllium and additional metal, display a hardness, which is very superior to that shown by known alloys. Thus for example the alloys Ni-Be-Mo have been shown to possess a Brinell hardness of nearly 500 with an annealing about 500° C. while the known alloys of Ni-Be show at most a Brinell hardness of about 400 with an annealing at 550° C.

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