Abstract
Ti-based bulk amorphous alloy with the composition of Ti40Zr25Ni8 Cu9Be18 of 3 mm in diameter was fabricated by suction casting method. The microstructure was investigated using X-ray diffraction (XRD), differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). In addition, the crystallization kinetics behavior and phase transition during crystallization process were studied by non-isothermal crystallization and isothermal anneal heat treatment, respectively. It is showed that the glass transition and crystallization behavior have the typical kinetic characteristics and better thermal stability with a supercooled liquid region ΔTx of 54 K and a phase transformation Ep1 of 213.04 kJ/mol, respectively, for the amorphous alloy. On the other hand, the process of crystallization contained two stages: in the first stage, the crystallization reactions correspond to the precipitation of quasicrystalline phase I in the amorphous matrix; in the second stage, the quasicrystalline phase I was transformed to Laves phase which is directly precipitated from the remaining amorphous matrix.
Original language | English |
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Pages (from-to) | 1215-1218 |
Number of pages | 4 |
Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
Volume | 36 |
Issue number | 7 |
State | Published - Jul 2007 |
Keywords
- Bulk amorphous alloy
- Crystallization
- Phase transformation
- Thermal stability
- Ti-based amorphous alloy