Influence of High Rates of Cooling on a Phase Composition and Physical Properties of the Co–Be and Cu–Be Alloys
V. F. Bashev, O. I. Kushnerov, Ye. V. Il’chenko, S. I. Ryabtsev, N. O. Kutseva, А. А. Kostina
Oles Honchar Dnipro National University, 13 Naukova Str., 49050 Dnipro, Ukraine
Received: 10.02.2018; final version - 07.08.2018. Download: PDF
The formation of homogeneous highly supersaturated (up to 23 at.% Be and 31.4 at.% Be in a Co–Be alloy and a Cu–Be alloy, respectively) solid solutions having the same composition as the initial liquid ($C_0$) is revealed in the Co–Be and Cu–Be alloys by the method of quenching from the liquid state (QLS). At the maximum cooling rates (10$^7$ K/s) sufficient to form an amorphous solid state, it is not possible to prevent ordering processes in the congruent equiatomic phase of CsCl-type Co–Be. At the same time, for a Cu–Be alloy, it is shown that, under the QLS conditions, a hybrid interstitial–substitutional-type solid solution can be formed. As experimentally confirmed, under the QLS conditions, a significant supercooling of the melt below the decomposition temperature of the phases of the eutectoid composition, namely, $\beta_1$ and $\beta$ in the Co–Be and Cu–Be alloys, respectively, is took place. The positive role of the QLS method in increasing of the level of the mechanical and hard-magnetic characteristics in rapid-quenched films is shown.
Key words: splat-quenching, peritectic and eutectoid reactions, equiatomic phase, magnetic characteristics, highly supersaturated solid solution.
PACS: 61.66.Dk, 62.20.Qp, 75.30.Kz, 81.05.Bх, 81.30.Bx, 81.40.Ef, 81.40.Rs
Citation: V. F. Bashev, O. I. Kushnerov, Ye. V. Il’chenko, S. I. Ryabtsev, N. O. Kutseva, and А. А. Kostina, Influence of High Rates of Cooling on a Phase Composition and Physical Properties of the Co–Be and Cu–Be Alloys, Metallofiz. Noveishie Tekhnol., 40, No. 9: 1231—1245 (2018) (in Russian)