【摘要】 利用拉伸split Hopkinson bar实验装置研究了出SiCp/6061Al复合材料及其基体合金的动态拉伸性能及应变硬化行为.结果表明,与静态加载类似,在动态加载条件下,SiCp/6061Al复合材料的强度高于基体合金的强度,其断裂延伸率低于基体合金的断裂延伸率.在低应变动态拉伸时,复合材料的应变硬化指数高于Al合金材料的应变硬化指数,随着应变的增加,复合材料的应变硬化指数迅速下降,以至低于基体合金的应变硬化指数.更多还原

【Abstract】 An investigation was made on the dynamic tensile deformation and strain hardening characteristic of a SiCp/6061AI composite and its matrix alloy using tensile split Hopkinson pressure bar apparatus. It is shown that under dynamic loading condition, as in the case of static loading, the strength of the SiCp/6061AI is higher and its elongation to fracture is lower than those of 6061AI alloy. At a low strain, the dynamic tensile strain hardening exponent of the studied composite is higher than that of its matrix alloy. However, the strain hardening exponent of the composite decreases rapidly with increasing strain, and becomes lower than that of its matrix alloy at a higher strain. The deformation and damage mechanisms are discussed in terms of dislocation.更多还原