激光3D打印非晶合金晶化体积分数的理论预测

Theoretical prediction of crystallization volumefraction for laser 3D printing of metallic glasses

采用一种有效的方法预测激光3D打印块状非晶合金的晶化程度,对于激光3D工艺参数的选择与优化至关重要。本工作从非晶合金的晶化动力学入手,通过测试不同加热速率下非晶合金的特征温度,获得非晶合金发生晶化所要克服的晶化激活能和Arrhenius指前因子,并结合有限元模拟技术,提出了一种预测激光3D打印非晶合金晶化体积分数的方法。以Zr50Ti5Cu27Ni10Al8(Zr50)非晶合金为模型体系,验证了该方法的有效性。结果表明:利用该方法获得的激光3D打印单道Zr50非晶合金晶化相体积分数为1.23%,与实验得到的晶化相体积分数1.65%较接近,这有力地证明了提出的激光3D打印非晶合金晶化体积分数的理论预测方法是可行的。

It is very important to apply an effective method to predict the crystallization degree of laser 3D printed bulk metallic glasses(BMGs)for selecting and optimizing the processing parameters of laser 3D printing.In the present study,beginning with the kinetics of crystallization of amorphous alloys,the crystallization activation energy and Arrhenius factor were obtained by testing the characteristics of the temperature of the amorphous alloy under different heating rates,then a novel method of predicting the volume fraction of crystallization for the metallic glass produced by laser 3D printing was proposed combined with the finite element simulation technology.The validity of the method was verified by using Zr 50 Ti 5Cu 27 Ni 10 Al 8(Zr50)amorphous alloy as the model system.The result shows that the volume fraction of the crystalline phase of the single-track Zr50 BMG obtained by this method is 1.23%,which is very close to the experimentally obtained crystallization phase volume fraction of 1.65%.This strongly proves the effectiveness of the theoretical prediction method for the crystallization volume fraction of laser 3D printing BMGs.