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Microstructure and elevated temperature mechanical properties of Al2O3/ TiB2/Al composites
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1.Graduate School at Shenzhen,Tsinghua University;2.School of Materials Science and Engineering,Tsinghua University;3.State Key Laboratory of Nuclear Powder Engineering CoLtd

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Science and Technology Key Project of Guangdong Province, China (2019B121204005)

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    Abstract:

    Aluminum matrix composites reinforced with micro-TiB2 and nano-Al2O3 particles were successfully fabricated by combining powder metallurgy and hot rolling with raw materials of fine atomized aluminum powders and TiB2 particles. The Al2O3/TiB2/Al composites exhibited a yield strength of 258.7 MPa and an ultimate tensile strength of 279.3 MPa at 25 °C due to the comprehensive strengthening effect of TiB2 and Al2O3 particles. The strengthening effect of TiB2 particles was significantly weakened with temperature rising to 350 ℃, and the Orowan strengthening mechanism between nano-Al2O3 and dislocation made the yield strength and tensile strength of the composite material reach 98.2MPa and 122.5MPa. After annealing at 350 ℃ for 1000h, due to the pinning effect of nano-Al2O3 on grain boundaries, the grains growth were suppressed significantly and the strength and hardness did not decrease significantly. The main fracture mechanism of composites changed from brittle TiB2 particle fracture to interface debonding between TiB2 and the matrix from room temperature to elevated temperature.

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[Wang Jia, Liu Wei, Shu Guogang, Li Qiulin. Microstructure and elevated temperature mechanical properties of Al2O3/ TiB2/Al composites[J]. Rare Metal Materials and Engineering,2021,50(3):787~794.]
DOI:10.12442/j. issn.1002-185X. E20200004

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History
  • Received:February 19,2020
  • Revised:March 05,2020
  • Adopted:March 19,2020
  • Online: April 02,2021
  • Published: