Crystallization of amorphous Zr-Be alloys
- 49 Downloads
The thermal stability and structure of binary amorphous Zr100 − x Be x alloys have been studied using differential scanning calorimetry and neutron diffraction over a wide concentration range (30 ≤ x ≤ 65). The amorphous alloys have been prepared by rapid quenching from melt. The studied amorphous system involves the composition range around the eutectic composition with boundary phases α-Zr and ZrBe2. It has been found that the crystallization of alloys with low beryllium contents (“hypoeutectic” alloys with x ≤ 40) proceeds in two stages. Neutron diffraction has demonstrated that, at the first stage, α-Zr crystallizes and the remaining amorphous phase is enriched to the eutectic composition; at the second stage, the alloy crystallizes in the α-Zr and ZrBe2 phases. At higher beryllium contents (“hypereutectic” alloys), one phase transition of the amorphous phase to a mixture of the α-Zr and ZrBe2 phases has been observed. The concentration dependences of the crystallization temperature and activation energy have been revealed.
KeywordsAmorphous Phase Beryllium Neutron Diffraction Amorphous Alloy Eutectic Composition
Unable to display preview. Download preview PDF.
- 1.A. M. Bratkovskii, S. L. Isakov, S. N. Ishmaev, I. P. Sadikov, A. V. Smirnov, G. F. Syrykh, M. N. Khlopkin, and N. A. Chernoplekov, Sov. Phys. JETP 73(4), 772 (1991).Google Scholar
- 5.J. Amato, F. Baudrocco, and M. Ravizza, Welding J. 51, 341 (1972).Google Scholar
- 10.M. Hansen and K. Anderko, Constitution of Binary Alloys (McGraw-Hill, New York, 1958; Metallurgizdat, Moscow, 1962), p. 324.Google Scholar