冷轧变形对5083Al/SUS405层状复合材料机械性能的影响OA

In order to improve the damping performance of aluminum alloys used in rail transit components for meeting the requirements of vibration reduction and noise control,this study employed a laminated heterogeneous composite approach,utilizing vacuum hot pressing and cold rolling to prepare 5083Al/SUS405 laminated composites.The effects of cold rolling reduction ratios on the microstructure and properties of the composites were investigated using X-ray diffraction,scanning electron microscopy,universal testing machines,and dynamic mechanical thermal analyzers.The results showed that as the cold rolling reduction rate increased,the interface between 5083Al and SUS405 gradually changed from a flat state to a wavy structure,eventually leading to necking and fracture in the SUS405 layer.Compared to the 5083Al,the tensile strengths of the hot-pressed composites and those with a 50%cold rolling reduction increased by 28%and 45%,respectively,while the elongation of the hot-pressed composites improved by 46%.When the cold rolling reduction ratio reached 75%,both tensile strength and elongation decreased.The damping performance of the hot-pressed composites was superior to that of the cold-rolled state and 5083Al across the entire strain amplitude range.In the cold-rolled composites,when the strain amplitude exceeded the second critical strain(microplastic deformation stage),the damping increased rapidly with strain amplitude,surpassing that of 5083Al.