不同热变形条件下脉冲电沉积制备Al2O3/Ni-Co纳米复合材料力学性能的研究  

Superplasticity of Al2O3/Ni-Co Nano-composite Prepared by Pulsed Electrodeposition Technique

作　　者：王华秀[1] 

机构地区：[1]衡水学院物理与电子信息系,河北衡水053000

出　　处：《铸造技术》2014年第10期2241-2243,共3页Foundry Technology

摘　　要：采用脉冲电沉积技术制备不同大小Al2O3颗粒的Al2O3/Ni-Co纳米复合材料,研究其在不同应变速率和变形温度下的力学性能变化。结果表明,在应变速率为8.33×10-4s-1时,变形温度升高,材料的伸长率先增大后减小;应变速率为1.67×10-2s-1时,变形温度升高,材料的伸长率先减小后增大。断裂后材料表面未发现硫的偏析,但出现大量位错和孪晶。表明经超塑性变形后,复合材料内孪晶是晶界滑移的重要协调机制。The superplasticity of A120~tNi-Co nano-composite materials prepared by pulsed electrodeposition technique was analyzed under different strain rate and deformation temperaratures. The results show that, at the strain rate of 8.33 ×10^4 s^-1, the material elongation first increases and then decreases with the increase of temperature, but at the strain rate of 1.67×10^-2 s^-1, the material elongation first decreases and then increases with the increase of temperatures. There is no sulfur segregation on the material fracture surface, but lots of twins and dislocations are observed. The high superplastieity of the composites results from the formation of twins at material grain boundaries.

关 键 词：低温超塑性 脉冲电沉积 显微结构 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TB333