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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。
A sample of NiCoCrAl / ZrO2-8Y2O3 (YSZ) multilayered thick microlaminate was heat-treated at 1050 ℃ under vacuum for 0.5, 2 and 4 h respectively to investigate its Recrystallization behavior. In addition to the metal / ceramic laminate structure, the micro-laminate material comprises five thick metal tough layers having a thickness between 5 and 25 μm. The results show that during the heat treatment, recrystallization occurs easily in the metal layer with the thickness of less than 13μm, and the recrystallized grain size increases with the layer thickness. However, the recrystallized metal layer with the thickness more than 20μm is more difficult to recrystallize. In addition, combined with the finite element analysis of the thermal stress in the specimen, the influence mechanism of the thickness of the ductile layer on the recrystallization behavior was discussed.