研究了SiCP/Ni纳米复合材料的超塑性.SiCP/Ni采用脉冲电沉积方法获得.拉伸实验温度为410℃和450℃,应变速率范围为8.3×10-4～5×10-2s-1.温度为450℃、应变速率为1.67×10-2s-1时,获得的最大延伸率为836%.采用SEM、TEM分析了沉积态材料的表面形貌、断口形貌及变形后的组织,并对变形机理进行了探讨.通过SiC颗粒稳定基体组织有利于实现材料的超塑性,低空洞体积分数有助于获得大延伸率.晶粒长大到微米尺度时,变形机制主要是位错协调的晶界滑移和位错滑移塑性.
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