CuYSi-Mg_(60)Cu_(30)Y_(10)块体非晶合金复合材料的晶化行为

Crystallization behavior of CuYSi-Mg_(60)Cu_(30)Y_(10) bulk amorphous alloy matrix composite

采用差示扫描量热仪(DSC)在不同加热速率下研究Mg60Cu30Y10块体非晶合金及CuYSi-Mg60Cu30Y10复合材料,并利用Kissinger以及Doyle方法研究CuYSi颗粒生成后对块体非晶合金变温晶化行为的影响。结果表明:CuYSi颗粒生成后,复合材料的变温晶化行为依然具有动力学效应,但生成的CuYSi颗粒减小了复合材料玻璃转变行为对升温速率的依赖程度;同时,颗粒的生成增加了复合材料发生玻璃转变以及起始晶化时所需要克服的能量势垒,提高了材料的热稳定性;局域晶化激活能随着复合材料晶化体积分数的增加而减小。

Differential scanning calorimeter （DSC） was used to investigate the Mg60Cu30Ylo bulk amorphous alloy and CuYSi-Mg60Cu30Ylo reinforced composite at different heating rates. The influence of CuYSi particles on crystallization behavior of the bulk amorphous alloy was studied by Kissinger＇s and Deloy＇s method. The results show that the kinetics effect on crystallization behavior is preserved for both Mg60Cu30Ylo bulk amorphous alloy and its CuYSi reinforced composite. However, CuYSi particle distribution in the glass matrix reduces the influence of the heating rate on the glass transition of the composite, while increases the energy barrier for the glass transition and the crystallization, thus improves the thermal stability. The local area activation energy decreases with increasing crystallization volume of the amorphous alloy matrix composite.