喷射成形建筑用硅质岩/铝基复合材料组织及力学性能分析

Analysis of microstructure and mechanical properties of siliceous rock/5052 composites for construction by jet forming

以硅质岩颗粒作为增强体,通过喷射成形工艺制备硅质岩/铝基复合材料,研究结果表明:在铝基体中存在大量弥散分布的硅质岩颗粒,不同粒径大小的颗粒都可以被高效捕获,并且均匀分布。硅质岩颗粒与铝基体组织达到良好镶嵌状态,大量位错出现在与界面较近的组织中,基体与颗粒的界面处产生了明显位错。在过渡区中Si含量较小,Al含量明显提高。当合金中掺入硅质岩颗粒后,铝基复合材料力学性能明显改善,拉伸强度与伸长率显著提升,提高比例大于10%。合金的断口形貌均为韧性断裂,断面区域产生了平整的组织结构,并且存在大量韧窝。

Siliceous rock particles were used as the reinforcing body,and the siliceous rock/aluminum-based composite material was prepared by jet forming process. The results show that a large number of dispersed siliceous rock particles are produced in the aluminum matrix,and the particles of different particle sizes can be captured efficiently to achieve uniform distribution. The siliceous rock particles are in a good Mosaic state with the aluminum matrix,and a large number of dislocations occur close to the interface,and obvious dislocations occur at the interface between the matrix and the particles. The content of Si at the transition zone is small and Al is obviously increased. When the siliceous rock particles are added into the alloy,the mechanical properties of the aluminum-matrix composites are significantly improved,and the tensile strength and elongation are significantly increased,the increase proportion is more than 10%. The fracture morphology of the alloy is characterized by ductile fracture,with flat structure and a large number of dimples.