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采用单辊甩带法在不同转速下制备Ti40Zr40Ni20合金薄带,通过X射线衍射(XRD)和透射电子显微术(TEM)分析各样品的急冷组织,并结合热分析方法,研究它们加热时的组织演化行为与相变特征。研究结果表明:随着甩带速率从40 m/s下降到10 m/s,Ti40Zr40Ni20薄带样品中依次生成了单相非晶、非晶+β-Ti(Zr)混合相和单相准晶组织;除单相铸态准晶外,前两种急冷组织在温度接近300℃时开始失稳生成纳米尺度的准晶相,当温度上升到540℃附近,组织中出现了cF96-(Zr,Ti)2Ni大单胞面心立方相(点阵参数a≈1.2 nm)。
Ti40Zr40Ni20 alloy ribbons were prepared by single roll rejection at different rotation speeds. The quenched microstructure of each sample was analyzed by X-ray diffraction (XRD) and transmission electron microscopy (TEM), and the thermal analysis Organizational Evolution and Phase Transitions. The results show that single-phase amorphous, amorphous and β-Ti (Zr) mixed phase and single-phase quasicrystal are formed in the Ti40Zr40Ni20 thin-film samples as the rejection rate decreases from 40 m / s to 10 m / In addition to single-phase as-cast quasicrystal, the first two quenched structures begin to lose their quasi-crystalline nanocrystalline phase at temperatures close to 300 ° C. When the temperature rises to around 540 ° C, cF96- (Zr, Ti) 2Ni macrocentric face-centered cubic phase (lattice parameter a≈1.2 nm).