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Microstructural evolution and mechanical behavior of in situ synthesized MgAl2O4 whiskers reinforced 6061 Al alloy composite after hot extrusion and annealing

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Abstract

In situ synthesized MgAl2O4 whiskers reinforced 6061 Al alloy composites were fabricated by a powder metallurgy method. Nano-sized MgAl2O4 spinel whiskers distributed uniformly in 6061 Al alloy matrix without any interfacial product and laid along the extrusion direction after hot extrusion. As-extruded composite samples were annealed at 530, 580, 600 and 630 °C for 1 h and examined by electron backscattered diffraction to investigate the recrystallization behavior of obtained composites. Microstructure and texture evolution was investigated, and it is found that the recrystallization process is inhibited by whiskers because of Zener pinning. Slender fibrous grains remain until 630 °C, and deformation textures still exist even in specimen annealed at 630 °C. Hardness and tensile tests show that the completely recrystallized sample has an ultimate tensile strength of 218 MPa and a hardness of HV 52 compared with 283 MPa and HV 69 of the unannealed sample. Mechanical properties of the annealed samples decline slightly with annealing temperature increasing up to 600 °C.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51571147).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China

    Geng Hao, Chun-Sheng Shi, Nai-Qin Zhao, En-Zuo Liu, Chun-Nian He, Fang He & Li-Ying Ma

  2. Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300350, China

    Geng Hao, Chun-Sheng Shi, Nai-Qin Zhao, En-Zuo Liu, Chun-Nian He, Fang He & Li-Ying Ma

  3. Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin, 300072, China

    Nai-Qin Zhao, En-Zuo Liu & Chun-Nian He

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  1. Geng Hao
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  2. Chun-Sheng Shi
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Correspondence to Chun-Sheng Shi.

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Hao, G., Shi, CS., Zhao, NQ. et al. Microstructural evolution and mechanical behavior of in situ synthesized MgAl2O4 whiskers reinforced 6061 Al alloy composite after hot extrusion and annealing. Rare Met. 42, 1732–1742 (2023). https://doi.org/10.1007/s12598-018-1119-6

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  • DOI: https://doi.org/10.1007/s12598-018-1119-6

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