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Determination of Hot Extrusion Parameters in a Spray-Formed Ultrahigh-Strength Aluminum Alloy

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Abstract

To determine a suitable industrial extrusion process, the hot deformation behavior of a spray-formed ultrahigh-strength aluminum alloy was studied with a series of isothermal compression tests. The temperature range was from 340 to 480 °C, while the strain rates ranged from 0.001 to 1 s−1. The flow stress behavior was studied, and the activation energy map showed the deformation difficulty degree under different compression conditions. The dynamic materials model processing map displayed three high-efficiency domains and two low-efficiency domains. As a result of the microstructure observations, it was determined that the high-efficiency domains were related to dynamic recrystallization, superplasticity and cracking. The optimum processing conditions were at intermediate temperatures from 410 to 430 °C and strain rates from 0.008 to 0.06 s−1. In light of the extrusion calibration, the practical extrusion condition was determined to be 410 °C/0.03 s−1. The surface morphology and microstructure after practical hot extrusion were consistent with the prediction by the processing maps and calibration.

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Acknowledgments

The authors wish to acknowledge the Science and Technology Major Project of Hunan Province (2017GK4002).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Yaru Liu, Qinglin Pan, Weiyi Wang, Mengjia Li & Ji Ye

  2. Manufacturing Center, CRRC Times Electric CO., Ltd., Zhuzhou, 412001, China

    Xiangdong Wang

  3. Hunan Oriental Scandium Co., Ltd., Changsha, 410083, China

    Xiaoping Wang

  4. Department of Mechanical and Systems Engineering, Gifu University, Gifu, Yanagido, 501-1193, Japan

    Zhigang Wang

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  1. Yaru Liu
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Correspondence to Weiyi Wang.

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Liu, Y., Wang, X., Pan, Q. et al. Determination of Hot Extrusion Parameters in a Spray-Formed Ultrahigh-Strength Aluminum Alloy. J. of Materi Eng and Perform 29, 800–810 (2020). https://doi.org/10.1007/s11665-020-04630-2

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