Grain size dependence of fracture toughness for fine grained alumina
Grain size dependence of fracture toughness for fine grained alumina
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DOI：
10.1016/j.scriptamat.2011.03.032
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发表时间：
2011-07
影响因子：
6
通讯作者：
W. Yao;J. Liu;T. Holland;Lin Huang;Y. Xiong;J. Schoenung;A. Mukherjee
中科院分区：
文献类型：
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作者：
W. Yao;J. Liu;T. Holland;Lin Huang;Y. Xiong;J. Schoenung;A. Mukherjee
使用弯曲法中的表面裂纹测量了一系列通过电场辅助烧结制备的晶粒尺寸从~290 nm 到~3.3 μm 的全致密多晶氧化铝样品的断裂韧性。根据威布尔分布对不同晶粒尺寸的断裂韧性值进行统计分析。研究发现，细粒氧化铝的断裂韧性与晶粒尺寸无关。根据威布尔分布计算出的特征断裂韧性为 3.37 MPa m1/2。
The fracture toughness of a series of fully dense polycrystalline alumina samples prepared by electrical field assisted sintering with grain sizes varying from ∼290 nm to ∼3.3 μm was measured using the surface crack in flexure method. Fracture toughness values for different grain sizes were statistically analyzed based on the Weibull distribution. It was found that the fracture toughness in fine grained alumina is independent of grain size. The characteristic fracture toughness calculated from the Weibull distribution is 3.37 MPa m1/2.