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Effect of Microstructural Scale on Thermal Shock Resistance of Aluminum‐Reinforced Alumina
Author(s) -
Schön Stefan,
Prielipp Helge,
Janssen Rolf,
Rödel Jürgen,
Claussen Nils
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb05352.x
Subject(s) - thermal shock , materials science , composite material , quenching (fluorescence) , aluminium , microstructure , fracture toughness , fracture mechanics , toughness , fracture (geology) , shock (circulatory) , composite number , medicine , physics , quantum mechanics , fluorescence
Thermal shock data are presented for two types of Al/Al 2 O 3 composites (35 vol% Al) with different microstructural scale and compared to a monolithic alumina. The fine‐scale Al/A1 2 O 3 material exhibits high room‐temperature strength (765 MPa) and a gradual decrease in retained strength with increasing quenching temperature difference, δ T , and improved thermal shock resistance—as compared to monolithic alumina—even at δ T = 600°C. The coarse‐scale Al/Al 2 O 3 composite shows high long‐crack fracture toughness (10.5 MPa·m 1/2 ) and almost no strength degradation up to δ T = 500°C. A qualitative picture for the effect of microstructural scale on thermal shock resistance emerges by employing a simple fracture mechanics description contrasting the crack driving force for transient stress fields with R ‐curve behavior.