Study On The Compression And Damping Properties Of Porous CuAlMn Shape Memory Alloy Based High Damping Materials Fabricated By A New Method

In order to develop novel high damping materials to meet the urgent need for vibration and noise reduction in many fields,porous CuAlMn shape memory alloy(SMA)and polystyrene/CuAlMn composite materials were successfully prepared by mechanical alloying,sintering-dissolution and sol-gel processes.SEM,XRD,DMA and universal testing machine were also used to observe the macro and micro morphologies,phase analysis,compression energy absorption properties and damping properties of the obtained materials.It was found that,The novel porous CuAlMn SMA presents a 3D network structure,and the interconnected granular pores are evenly distributed in the matrix of the alloy.The pores in the porous CuAlMn SMA can be completely filled with polystyrene.The interfaces in the obtained polystyrene/CuAlMn composite is well bonded without obvious gaps or holes.Porous CuAlMn SMAs prepared in the present study have excellent compressive and energy absorbing properties.Filling of polystyrene can further improve their compressive strength,which is mainly due to the blocking effect of polystyrene on the collapse of pores.The addition of flake mica or flake graphite into polystyrene has little effect on the compression stress-strain curve of the polystyrene/CuAlMn composite in the platform area,but it can significantly improve the elastic modulus and densification stress level in densification area of the material.The porous CuAlMn SMA prepared in the present study also has excellent martensitic transformation behavior and high damping capacity.After filling polystyrene into the pores,during heating process an internal friction(IF)peak arises at around 108 ? on the IF-temperature spectrum.It is believed that this peak should originate from the glass transition of the polystyrene.This peak greatly improves the damping capacity of the porous CuAlMn SMA in the low temperature region.The addition of flake mica or flake graphite into polystyrene can significantly increase the height of the IF peak,which has been attributed to the superposition of multiple damping sources.