Al/Mg层状复合材料动态压缩行为及影响因素  

Dynamic Compressive Behavior of Al/Mg Laminated Composites and Its Influencing Factors

作　　者：李珊珊[1] 郑秀华[1] 谭成文[1] 张磊[1] 王富耻[1] 才鸿年[1] 

机构地区：[1]北京理工大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2007年第11期880-882,共3页Special Casting & Nonferrous Alloys

摘　　要：利用Hopkinson压杆实验装置对轧制复合制备的Al/Mg层状金属复合材料进行动态压缩试验,分析了动态压缩应力-应变响应特征以及不同轧制工艺对应力-应变关系的影响。结果表明,在约103s-1应变率时,Al/Mg层状金属复合材料应变率强化效应与动态热软化效应表现明显;随轧制压下率增大,材料流变应力降低;轧制温度对Al/Mg复合材料应力-应变曲线影响较大,流变应力变化规律不明显;轧后经300℃、1h退火后Al/Mg复合材料流变应力降低。镁合金断口形貌表现出解理裂纹等脆性断裂特征,伴有热软化效应产生的韧窝状撕裂棱;铝合金断口形貌主要表现为沿晶的脆性断裂并伴随晶间化合物的破断。The dynamic compressive stress via strain response characteristics and effects of different rolling routes on it have been analyzed by conducting the dynamic compressive experiment on Al/Mg laminated composites prepared by compound rolling with the Hopkinson bar.The results reveal that stress via strain behavior of the Al/Mg laminated composites exhibits evidently the strain rate hardening effects and the dynamic hot softening effects with the strain rate in range of about 103s-1.With increasing the rolling reduction rate,the flow stress of the composites can be decreased.The rolling temperature has the important effects on σ-ε curves of the Al/Mg laminated composites while it has little affected the flow stress.The flow stress of rolled Al/Mg laminated composites can be decreased with annealing at 300 ℃ for 1 hours.The fracture morphology of the magnesium alloy is characterized by cleavage fracture with dimple rupture tearing ridge resulting from the hot softening effect,while the fracture morphology of the aluminum alloy is characterized by intergranular brittle crack with the rupture of intercrystalline compound.

关 键 词：Al/Mg复合材料 轧制 动态压缩 应变率 

分 类 号：TB331[一般工业技术—材料科学与工程] TG113[金属学及工艺—物理冶金]