کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
821851 | 1469556 | 2009 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Hot workability and deformation mechanisms in Mg/nano–Al2O3 composite Hot workability and deformation mechanisms in Mg/nano–Al2O3 composite](/preview/png/821851.png)
The response of extruded Mg/nano–Al2O3 (1 vol.%) composite to hot working in the temperature range 300–500 °C and strain rate range 0.0003–10 s−1 has been characterized using processing map and kinetic analysis. The hot working window for the composite occurs at strain rates >0.1 s−1 and the optimum range of temperature is 400–450 °C. In this window, the behavior of the composite is similar to that of the matrix and is controlled by the grain boundary self-diffusion. At lower strain rates, however, the composite exhibits much higher apparent activation energy than that for lattice self-diffusion unlike the matrix material. The deformed microstructures revealed that the prior particle boundaries decorated by the nano-Al2O3 particles, are stable and do not slide, rotate or migrate but kink after compressive deformation and as such contribute to the high temperature strength of the composite.
Journal: Composites Science and Technology - Volume 69, Issues 7–8, June 2009, Pages 1070–1076