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利用真空电弧熔炼和喷铸方法制备了直径为3 mm的Ti40Zr25Ni8Cu9Be18大块金属玻璃棒材。在推杆式热膨胀仪上利用连续升温热膨胀方法研究了该Ti基金属玻璃的结构转变行为。研究发现,该非晶合金的结构转变行为分为5个不同的阶段,分别为弛豫准备阶段,结构弛豫阶段,一级晶化阶段,二级晶化阶段和晶粒长大阶段。TEM观察发现,热膨胀后形成了20 nm左右的纳米晶。研究还发现,该Ti基金属玻璃热膨胀曲线上的特征温度与DSC曲线上的特征温度具有很好的一致性。
A 3 mm diameter Ti40Zr25Ni8Cu9Be18 bulk metallic glass bar was prepared by vacuum arc melting and spray casting. The structure transformation behavior of the Ti-based metallic glass was studied by the method of continuous heating and thermal expansion on the rod-type thermal dilatometer. The results show that the structural transformation behavior of the amorphous alloy is divided into five different phases: relaxation preparation stage, structural relaxation stage, primary crystallization stage, secondary crystallization stage and grain growth stage. TEM observation revealed that nanocrystals of about 20 nm formed after thermal expansion. The study also found that the Ti-based glass thermal expansion curve of the characteristic temperature and DSC curve characteristic temperature has good consistency.