ABSTRACT

This experimental study deals with the effect of modifying an Si-rich LM6 cast alloy by ball milling with Si/Al powder particulates in which alloying was conducted via semi-solid liquid processing. The cast alloys were analyzed via their tensile properties with a microstructural evaluation of their fractured surfaces. The tensile results reveal the influence of ball-milled Si-rich powdery chips on the cast materials and demonstrate an improvement in tensile properties for 10% (R = 0.1) and 25% (R = 0.25) addition of reinforcement particulates. The combined effect of processing and the presence of Si-rich particulates is identified on the fractured surfaces. The results also show that higher values of tensile stress and Young’s modulus are obtained for the R = 0.1 samples but that the strain was higher for the R = 0.25 samples. A mechanism and model for the tensile fracture, and particle and interface cracking are proposed according to microstructure and EDX observations.

摘要

本实验研究涉及通过球磨与 Si/Al 粉末颗粒改性富硅 LM6 铸造合金的效果，其中合金化是通过半固态液体加工进行的。铸造合金通过其断裂表面的微观结构评估通过其拉伸性能进行分析。拉伸结果揭示了球磨富硅粉状碎屑对铸造材料的影响，并证明了在添加 10% ( R  = 0.1) 和 25% ( R  = 0.25) 的增强颗粒时拉伸性能有所改善。在断裂表面上确定了加工的综合影响和富硅颗粒的存在。结果还表明， R获得了更高的拉伸应力和杨氏模量值= 0.1 个样品，但R  = 0.25 个样品 的应变更高。根据微观结构和 EDX 观察，提出了拉伸断裂、颗粒和界面开裂的机理和模型。