Apart from the basis metal, beryllium and the solubilizing metal, these alloys may contain, in addition, various elements in a very small proportion; it is more particularly possible to add iron in a proportion which, in every case, is smaller than 4% in order to give the alloy a very high fluidity in casting. It is only in the case of conducting alloys that it is preferable to refrain from adding iron.
The alloys according to the invention, for in-stance the alloys Ni-Be-Mo, likewise display very greatly improved qualities and even more particularly for the conducting alloys a greatly improved electrical. conductivity when they have been subjected to physical treatments such as those mentioned above, for example thermal treatments of quenching and annealing, which secure their perfect homogeneity.
In the accompanying drawings various diagrams corresponding to characteristics of alloys made according to the invention are given. In these drawings:
Figure 2 is a diagram of the hardness curve of two Ni-Be-Mo alloys as a function of the temperature to which the alloys are heated before quenching.
Figures 3 and 4 are diagrams of hardness curves for each of the two alloys respectively, after quenching and annealing at the temperatures indicated on the curves, they illustrate thus the variation of the hardness with varying duration of annealing at specified temperatures.
Figure 5 is a diagram of curves showing the tensile strength (R) and elongation (A%) of an alloy according to the invention after quenching ànd annealing, at the temperatures specified on the curves, illustrating the variations of the tensile strength and elongation with varying duration of annealing at specified temperatures.
|
