ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Two aluminium titanate (AT) ceramics containing magnesium and iron were sintered to study their high-temperature mechanical property and thermal stability. Both materials exhibited a pronounced inelastic stress–strain behaviour which is caused by extensive microcracks. The microcracking also led to an increasing R-curve behaviour which was measured in the Mg–AT material in the as-sintered state. At 1000 °C, crack healing took place which led to an increase in the strength and Young's modulus. At 1100 °C, the glassy phase started to soften which resulted in a reduction of the strength and Young's modulus. Thermal stability was assessed after annealing at 1000, 1100 and 1200 °C for 250 and 1000 h in air. Although the Fe–AT material did not show any significant decomposition and degradation in mechanical properties, the Mg–AT material annealed at 1000 and 1100 °C showed pronounced decomposition into corundum and rutile. The decomposition led to a brittle fracture, but increased the strength and Young's modulus. Both materials showed a lower coefficient of thermal expansion (〈0.2×10-6K-1) than that of stoichiometric aluminium titanate. The results are discussed with respect to the microstructure and phase relationship. © 1998 Chapman & Hall
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1004368029554
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