精品文档---下载后可任意编辑DD417G 低密度单晶合金的蠕变、疲劳行为及热稳定性讨论中期报告Abstract:This progress report presents the ongoing research on the creep, fatigue behavior, and thermal stability of a low-density single-crystal alloy DD417G. The work includes both experimental and theoretical investigations. Creep tests at different temperatures and stresses were conducted, and the results were analyzed using empirical models and theoretical models, such as the power-law creep model, the Norton-Bailey creep model, and the dislocation climb model. The fatigue tests were carried out under both tensile and compressive loading conditions, and the results were interpreted in terms of cyclic stress-strain behavior, S-N curves, fatigue crack propagation, and fracture modes. The thermal stability of the alloy was evaluated by examining the microstructural evolution and mechanical properties after annealing at elevated temperatures. The experimental work was complemented by crystal plasticity finite element simulations, which provide insights into the underlying mechanisms of the creep and fatigue behavior of the alloy.Introduction:Low-density materials, particularly those that exhibit high strength and creep resistance, are of great interest for aerospace, automotive, and energy applications, where weight reduction is a critical factor for enhancing performance and efficiency. DD417G is a new single-crystal alloy that has recently been developed with a density of 8.1 g/cm³ and a remarkably high strength-to-weight ratio. Its unique crystal structure and composition hold promising potentials for advanced materials applications. However, the understanding of the creep, fatigue, and thermal stability of DD417G is still limited. In this study, ...
