Abstract
The hot deformation behavior and processing map of 20vol%Al18B4O33w/2024 composites were investigated by isothermal compression test within the temperature range of 380–500 ℃ and the strain rate range of 0.001–1 s−1. The results show that with the increase of temperature and decrease of strain rate, the flow stress decreased gradually during hot deformation. Due to dispersed strengthening caused by Al18B4O33 whiskers, the activation energy of the composite was much higher than the self-diffusion energy of pure Al. With the increase of deformation temperature, the deformation softening mechanism of the Al matrix composites was controlled both by dynamic recovery and dynamic recrystallization. The dynamic material model (DMM) was reliable in predicting the safe deformation regions. The Prasad’s instability criterion was appropriate in predicting the flow instability regions. The optimum deformation condition was 460–480 ℃ and 0.01–0.1 s−1, which was validated by near isothermal two-directional forging experiment. This study provided an effective guidance on hot working of Al18B4O33w whisker reinforced Al matrix composites.
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Xu, W., Zeng, X., Jin, X., Shan, D. (2018). Study on Hot Deformation Behavior and Processing Map of 20 Volume Percent Al18B4O33w/2024 Composites. In: Srivatsan, T., Zhang, Y., Harrigan, Jr., W. (eds) Metal-Matrix Composites Innovations, Advances and Applications . TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72853-7_4
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