采用电沉积方法制备了平均晶粒尺寸为45nm的ZrO2/ Ni复合材料,并通过拉伸和胀形试验对该材料的超塑性能进行了研究.拉伸试验结果表明:材料在温度为420~ 500℃,应变速率为8.33×10-4s-1～1.67×10-2s-1时均获得了高于200%的延伸率.在温度为450℃和应变速率为1.67×10-3s-1时,得到最大延伸率605%.用扫描电镜SEM对拉伸前后试件的显微组织进行了观察,发现晶粒在温度的作用下明显长大.采用内径5 mm的凹模对ZrO2/Ni复合材料进行超塑胀形试验,在温度为420~ 500℃获得高径比H/d高于0.5的胀形件,说明该材料具有良好的超塑性能.
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