The Use of Micromechanical Models in the Prediction of Microstructural Paths and Constitutive Parameters for the Densification of Powders

该项目开发了基于氧化铝粉末和Inconel N625高温合金粉末致密化的微观力学模型，以预测致密化过程中发生的微观结构变化路径。一些加工变量对连续介质力学模型所需的微观结构和本构参数的影响也在研究中。由于缺乏准确的动力学信息值，如扩散系数，以及由于没有将粉末颗粒的内部结构包括在微观力学模型中，早期的模型表现不佳。考虑了这些因素，并对模型进行了实验验证。＊＊＊

Nettleship The project develops micromechanical models based on the densification of an alumina powder and an Inconel N625 superalloy powder to predict the path of microstructural changes occurring during densification. The effects of some processing variables on the microstructure and constitutive parameters that would be needed for the continuum mechanics models are also being studies. Earlier models have not performed well due to the lack of accurate values for kinetic information such as diffusion coefficients as well as due to not including the internal structure of the powder particles into micromechanical models. The factors are taken into account and experimental verification of the model is performed. ***