6061铝合金环形锻件动态力学性能与失效行为

为了研究6061铝合金环形锻件在冲击载荷下的动态力学性能和失效行为,在室温下分别采用分离式霍普金森压杆装置(SHPB)与冲击摆锤试验机测试其动态压缩力学性能与动态冲击力学性能,并利用金相显微镜(OM)、扫描电子显微镜(SEM)对冲击试样进行了组织和断口的显微分析.结果表明:6061铝合金环形锻件在室温、高应变率下具有正...

Dynamic mechanical properties and failure behavior on 6061 aluminum alloy annular forgings

For studging the dynamic mechanical properties and failure behavior of 6061 aluminum alloy annular forgings under impact load,its dynamic compression mechanical properties and dynamic impact mechanical properties at room temperature were tested respectively by the split hopkinson pressure bar(SHPB)and pendulum impact testing machine,and the structure and fracture for specimens after impact were analyzed by optical microscope(OM)and scanning electron microscope(SEM).The results show that the 6061 aluminum alloy annular forgings have a positive strain rate strengthening effect at room temperature and high strain rate.After solution treatment and aging treatment,its dynamic compressive strength increases gradually with the maximum dynamic compressive strength of 365 MPa under the strain rate of 3300 s^-1,while the ductility decreases gradually.At room temperature,after solution treatment,the 6061 aluminum ally annular forgings show relatively excellent comprehensive impact performance with the maximum impact power of 17.2 J and the maximum impact toughness of 215.1 k J·m^-2.The impact fracture after forging is ductile fracture,the fracture after solution is ductile and brittle mixed fracture,and the fracture after aging is brittle fracture.