Competing High-Temperature Deformation Mechanisms in Mo(Si,Al)2–Al2O3 Composites

Aina Edgren, Erik Ström, Magnus Hörnqvist Colliander
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Abstract

Mo(Si,Al)2–Al2O3 composites were tested in four-point bending at 1300 °C. The addition of Al2O3 led to a decrease in grain size, and a subsequent decrease in strength for materials containing up to 15 wt pct Al2O3. At higher Al2O3 fractions, the decrease in grain size saturates and the strength is recovered as the Al2O3 particles prevent grain boundary sliding.

Abstract Image

Mo(Si,Al)2-Al2O3 复合材料中相互竞争的高温变形机制
Mo(Si,Al)2-Al2O3 复合材料在 1300 °C 下进行了四点弯曲测试。添加 Al2O3 会导致晶粒尺寸减小,从而降低材料的强度,Al2O3 的含量最高可达 15 wt pct。当 Al2O3 的比例较高时,晶粒尺寸的减小趋于饱和,由于 Al2O3 颗粒阻止了晶界滑动,因此强度得以恢复。
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