电沉积制备ZrO2／Ni纳米复合材料的超塑性

Superplasticity of ZrO_2/Ni Nanocomposite Produced by Electrodeposition

采用电沉积方法制备了平均晶粒尺寸为45 nm的ZrO2/Ni纳米复合材料,并通过拉伸试验对该材料的超塑性能进行了研究。结果表明:ZrO2/Ni纳米复合材料具有低温高应变速率超塑性,在温度为450℃、应变速率为1.67×10-3/s时,获得的最大伸长率为605%。采用SEM和TEM分析了沉积态材料及变形后的组织,并对变形机理进行了探讨。ZrO2/Ni纳米复合材料的超塑变形机制主要是晶界滑移,S元素的析出在一定程度上协调了变形。

Superplasticity of ZrO2/Ni nanocomposite with a mean size of 45 nm produced by electrodeposition was investigated under the tensile test. ZrO2/Ni nanocomposite exhibited low temperature and high strain rate superplasticity. Maximum elongation of 605% was obtained at a temperature of 450℃ and a strain rate of 1.67 ×10^-3/s. As-deposited microstrueture and deformed microstructure were observed by SEM and TEM. Based on the observed results, the deformation mechanism was analyzed. The main deformation mechanism is grain boundary sliding accommodated by S segregation.