高温高压下冲击波淬火的锆基大块金属玻璃的相演化过程研究

Phase Evolution of Zr-Based Bulk Metallic Glass Prepared by Shock-Wave Quenching under High Temperature and High Pressure

采用同步辐射能散X射线衍射技术,研究了高温高压下利用冲击波淬火技术制备的Zr41Ti14Cu12.5Ni10Be22.5大块金属玻璃的相演化过程。研究结果发现:在实验压力范围内,在不同压力下试样具有相同的初始析出相Zr2Be17,但是随后的相演化过程是不同的,根据应用压力的不同,试样的相演化过程可以分为3个不同的区域;另外,试样的晶化温度随着压力的增大而升高,但是在6.0 GPa存在一个突然的下降,在此压力点试样具有不同于其它压力点的相演化过程。相演化过程的不同和晶化温度的突然下降,可能归因于在不同压力下试样具有不同的原子构型。

Phase evolution（PH） of Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass（BMG） prepared by shock-wave quenching has been studied under high-temperature and high-pressure using in situ synchrotron radiation energy-dispersive X-ray diffraction.The results show that the primarily precipitated phase is Zr2Be17 at applied pressures,but the subsequent PH processes are different.The crystallization temperature increases with pressure,but with a sudden drop at about 6.0 GPa.Compared with experimental results of the BMG prepared by water quenching,it can be concluded that crystallization temperature of the BMGs prepared by shock-wave quenching and water quenching all drop at the same pressure region,at which their PHs are different from those of other pressures.The different PHs and the drop of crystallization temperature may be attributed to that the BMG possesses different atomic configuration at different pressures.