Establishment of Processing Maps for 25vol.% B₄C_P/AA6061 Composite and its Application in Hot Pack-Rolling Process

Abstract:

The hot workability and hot pack-rolling process of B₄C_P/AA6061 composite were studied. The results showed that the addition of B₄C particles could effectively promote the dynamic recrystallization (DRX) process of the composite. DRX and DRX grains growth were dominant deformation mechanism during hot deformation of B₄C_P/AA6061composite. Typical instability defects included micro voids and particle aggregation. The optimum processing parameters for good workability were obtained in the temperature range of 450°C-500°C and strain rate range of 0.01s^-1-0.1s^-1. According to the flow stress curves and processing maps, a temperature of 500°C and a rolling velocity of 40 mm/s were chosen for pack-rolling experiments. The pack-rolled composite sheets in the RD and TD showed more homogeneous DRX grains than as-HIPed microstructures, which might indicate that hot pack-rolling could lead to more homogeneous microstructures without any edge cracking and surface cracking.

• Periodical: Materials Science Forum (Volume 913)
• Pages: 498-508
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.913.498
• Online since: February 2018
• Authors: Sheng Pu Liu*, De Fu Li, Sheng Li Guo, Peng Du
• Keywords: B4CP/AA6061, Composites, Hot Pack-Rolling, Processing Map

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