The mechanical performance of alumina as a function of grain size
1994; Elsevier BV; Volume: 36; Issue: 3-4 Linguagem: Inglês
10.1016/0254-0584(94)90037-x
ISSN1879-3312
AutoresWei‐Hsing Tuan, Minjie Lai, Mao‐Chao Lin, CHO‐YU CHAN, Shao‐Cheng Chiu,
Tópico(s)Aluminum Alloys Composites Properties
ResumoThe mechanical properties of ceramics usually exhibit a strong dependence on the microstructure. In the present study, the dependence of mechanical properties (namely, flexure strength, fracture toughness, Weibull modulus and R-curve behavior) of alumina on grain size is investigated. The results suggest that the strength of alumina decreases with increasing grain size. However, owing to the fact that specimens with a certain grain size do not behave as brittle, Griffith solids, the strength is not exactly proportional to G−0.5. The fracture toughness increases with increasing grain size; the toughness was determined by the single-edge precracked beam (SEPB) and the indentation techniques. No dependence of Weibull modulus or R-curve behavior on grain size was observed. However, the Weibull modulus and R-curve behavior are strongly correlated with each other. R-curve behavior was observed for the specimens with higher Weibull modulus.
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