Abstract
In this study, the deformable titanium (Ti) particles reinforced AZ91 composite was successfully prepared by powder metallurgy and subsequent extrusion. The mechanical properties and microstructural evolution of pure AZ91 and 5Ti/AZ91 composite were studied. The yield strength, ultimate tensile strength, and elongation of 5Ti/AZ91 composite are measured to be 212 MPa, 323 MPa, and 10.1%, respectively. Microstructure analysis revealed that Ti particles are elongated along the extrusion direction, forming a discontinuous strip Ti particles, fine precipitated Mg17Al12 phase inhibits dynamic recrystallization (DRX) behavior through Zener pinning effect and hinders the growth of matrix grains, resulting in refiner grains of 5Ti/AZ91 composite. Heterogeneous deformed Ti particles and magnesium (Mg) matrix to generate additional heterogeneous deformation-induced (HDI) strengthening. Heterogeneous deformation-induced strengthening mainly contributed to the increment of yield strength for 5Ti/AZ91 composite.
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Acknowledgements
This word was financially supported by the Guangdong Major Project of Basic and Applied Basic Research (No. 2020B0301030006), the National Natural Science Foundation of China (Nos. 52171133 and 52171103), the “111 Project” (B16007) by the Ministry of Education and Fundamental Research Fund of Central Universities in China (No. 2018CDJDCL0019).
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Tang, B., Li, JB., Ye, JL. et al. Strengthening Mechanism and Microstructure of Deformable Ti Particles Reinforced AZ91 Composite. Acta Metall. Sin. (Engl. Lett.) 35, 1935–1945 (2022). https://doi.org/10.1007/s40195-022-01428-0
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DOI: https://doi.org/10.1007/s40195-022-01428-0