Theoretical prediction method of Young's modulus and yield strength of micron particle reinforced metal matrix composites at different temperatures

• Published in: Composite structures 2023-07, Vol.316, p.117051, Article 117051
• Main Authors: Dong, Pan, Ma, Yanli, Zhang, Xuyao, He, Yi, Zhao, Ziyuan, Ma, Jianzuo, Li, Weiguo, Li, Yile
• Format: Article
• Language: English
• Subjects: Grain boundary slip; Micron particle reinforced metal matrix composites; Porosity; Prediction model; Temperature dependent; Young's modulus and yield strength
• ISSN: 0263-8223; 1879-1085
• DOI: 10.1016/j.compstruct.2023.117051

•The established models only need the basic parameters of the materials.•The effect of temperature and porosity on Young's modulus of PRMMC is characterized.•Main mechanism of yield strength of PRMMC at high temperatures is revealed.•The effect of particle size on main mechanism of yield strength is analyzed.•Good agreements are obtained between model predictions and experiments. To begin with, a theoretical characterization model of temperature and porosity dependent Young's modulus for micron particle reinforced metal matrix composites is established by considering the evolution of properties of reinforced particles and metal matrix with temperature. Additionally, combining the existing strengthening mechanism theory and incorporating the influence of grain boundary slip on the related strengthening mechanism and the yield strength of metal matrix, a temperature dependent yield strength analysis model of micron particle reinforced metal matrix composites is proposed. These models only require material parameters at room temperature and temperature dependent specific heat capacity at constant pressure for application. In addition, the predicted results from these models are reasonable and consistent with measured results. Moreover, based on the established models, the effects of key material parameters and main mechanisms on Young's modulus and yield strength of composites and their variation with temperature are explored. Furthermore, the variation of various control mechanisms with the particle size and temperature is clarified. It lays a theoretical foundation for the development of micron particle reinforced metal matrix composites that are suitable for high-temperature environments and for the optimization of their key parameters.