【摘要】 在1050℃的真空条件下,对一种NiCoCrAl/ZrO2-8Y2O3(质量分数,%,下同)(YSZ)多层厚微叠层材料试样分别进行了0.5,2和4h热处理,以研究其再结晶行为。该微叠层材料除了含有金属/陶瓷薄叠层结构外,还包含5层厚度在5~25μm之间的厚金属韧性层。研究表明,在热处理过程中,厚度小于13μm金属层较容易发生再结晶,而且再结晶的晶粒尺寸随着层厚的增加而增加;而厚度超过20μm的金属层则较难发生再结晶。此外,结合对试样中热应力的有限元分析,探讨了金属韧性层厚度对其再结晶行为的影响机理。更多还原

【Abstract】 A multiscalar microlaminate, NiCoCrAl/ZrO2-8Y2O3 was annealed in vacuum at 1050 ℃ for 0.5, 2 and 4 h, respectively. The microlaminate comprised metal/ceramic thin stacks and tough phase layers with thickness ranging from 5 μm to 25 μm. After annealing, the variation in microstructure of metal layers of the microlaminate depended on their layer-thicknesses. The metal-layers with layer-thicknesses more than 20 μm was more difficult to be recrystallized than those with layer-thicknesses less than 13 μm. And when the thicknesses of the metal layers were less than 13 μm, recrystallized grain sizes increased with the increasing layer-thickness. Furthermore, the mechanism of recrystallization for the metal-layers with different thicknesses was discussed.更多还原