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

• DOI: 10.1016/j.jmst.2016.03.025
• Publication Date: 2016-09-19T17:45:31Z
• Authors: L. Zhang; W.Q. Li; Z.W. Zhu; H.M. Fu; H. Li; Z.K. Li; H.W. Zhang; A.M. Wang; H.F. Zhang
• Keywords: Matrix (chemical analysis)

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 47.5 Zr 33 Cu 5.8 Co 3 Be 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.