Distribution of Be in a Ti-Based Bulk Metallic Glass Composite Containing B-Ti

doi:10.1016/j.jmst.2016.03.025

Abstract

Abstract:

In order to obtain a glassy matrix during quenching, Be is often selected as a constituent of the compositions of Ti/Zr-based bulk metallic glass composites (BMGCs). The in situ formed β phase in Be-bearing BMGCs was reported to be Be-free. However, a thorough investigation of the distribution of Be in BMGCs is still missing to date. In this work, the distribution of Be in a Ti_47.5Zr₃₃Cu_5.8Co₃Be_12.5 (at.%) BMGC was studied by the secondary ion mass spectrometry (SIMS) and the electron energy loss spectroscopy (EELS). It is found that Be almost totally dissolves in the glassy matrix, but a very weak intensity of Be in β phase is still detectable by SIMS, and the content of Be in β-Ti is estimated to be about 0.3 at.%. Based on the recently established two-phase quasi-equilibrium of BMGCs, the distinct solubility of Be in the glassy matrix and in β-Ti has been explained.

Key words: Bulk metallic glass (BMG), Metallic glass composite, Beryllium, Quasi-equilibrium

Zhang L., Li W.Q., Zhu Z.W., Fu H.M., Li H., Li Z.K., Zhang H.W., Wang A.M., Zhang H.F.. Distribution of Be in a Ti-Based Bulk Metallic Glass Composite Containing B-Ti[J]. J. Mater. Sci. Technol., 2017, 33(7): 708-711.

Figures/Tables 5

Fig. 1. (a) XRD pattern and (b) SEM micrograph of the 100 g ingot of BT48.

Fig. 2. (a) BF-TEM micrograph with an inset of the SAED pattern and (b) HRTEM image with an inset of FFT image of BT48.

Fig. 3. Elemental mappings of BT48 by SIMS.

Fig. 4. EELS spectra from either phase in BT48.

Fig. 5. Schematic illustration of Be atoms in the supercooled liquid and the β-Ti phase.

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