Temperature dependence of hardness in yttria-stabilized zirconia single crystals
Temperature dependence of hardness in yttria-stabilized zirconia single crystals
复制标题
氧化钇稳定氧化锆单晶硬度的温度依赖性
DOI：
10.1111/j.1151-2916.1991.tb04049.x
复制
发表时间：
1991
影响因子：
3.9
通讯作者：
A. Heuer
中科院分区：
文献类型：
--
作者：
G. Morscher;P. Pirouz;A. Heuer
研究了9.5mol%Y_2O_3-全稳定ZrO_2单晶的硬度和微裂纹随取向的温度变化关系。裂纹长度随温度升高而增加，直至500°C;高于800°C时，未发现裂纹，表明压痕脆性到韧性的转变为10800 °C。硬度的温度依赖性在500°C附近降低。蚀刻研究，以划定塑性区周围和下面的凹痕确定了工作滑动系统。讨论了塑性区内位错及其相互作用对ZrO_2硬度和压痕断裂行为的影响。
The temperature dependence of hardness and microcracking in single-crystal 9.5-mol%-Y2O3-fully-stabilized cubic-ZrO2 was studied as a function of orientation. Crack lengths increased with increased temperature up to 500°C; above 800°C, no cracks were found, indicating an indentation brittle-to-ductile transition of ∼800°C. The temperature dependence of hardness was reduced around 500°C. Etching studies to delineate the plastic zone around and below indents identified the operative slip systems. The role of dislocations and their interactions within the plastic zone on the hardness and indentation fracture behavior of cubic-ZrO2 are discussed.