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Effect of Microstructural Scale on Thermal Shock Resistance of Aluminum-Reinforced Alumina

Schön, Stefan and Prielipp, Helge and Janssen, Rolf and Rödel, Jürgen and Claussen, Nils (1994):
Effect of Microstructural Scale on Thermal Shock Resistance of Aluminum-Reinforced Alumina.
In: Journal of the American Ceramic Society, pp. 701-704, 77, (3), ISSN 0002-7820, [Online-Edition: http://dx.doi.org/10.1111/j.1151-2916.1994.tb05352.x],
[Article]

Abstract

Thermal shock data are presented for two types of Al/Al2O3 composites (35 vol% Al) with different microstructural scale and compared to a monolithic alumina. The fine-scale Al/A12O3 material exhibits high room-temperature strength (765 MPa) and a gradual decrease in retained strength with increasing quenching temperature difference, δT, and improved thermal shock resistance—as compared to monolithic alumina—even at δT= 600°C. The coarse-scale Al/Al2O3 composite shows high long-crack fracture toughness (10.5 MPa·m1/2) and almost no strength degradation up to δT= 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.

Item Type: Article
Erschienen: 1994
Creators: Schön, Stefan and Prielipp, Helge and Janssen, Rolf and Rödel, Jürgen and Claussen, Nils
Title: Effect of Microstructural Scale on Thermal Shock Resistance of Aluminum-Reinforced Alumina
Language: English
Abstract:

Thermal shock data are presented for two types of Al/Al2O3 composites (35 vol% Al) with different microstructural scale and compared to a monolithic alumina. The fine-scale Al/A12O3 material exhibits high room-temperature strength (765 MPa) and a gradual decrease in retained strength with increasing quenching temperature difference, δT, and improved thermal shock resistance—as compared to monolithic alumina—even at δT= 600°C. The coarse-scale Al/Al2O3 composite shows high long-crack fracture toughness (10.5 MPa·m1/2) and almost no strength degradation up to δT= 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.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 77
Number: 3
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 15 Jun 2012 08:49
Official URL: http://dx.doi.org/10.1111/j.1151-2916.1994.tb05352.x
Identification Number: doi:10.1111/j.1151-2916.1994.tb05352.x
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