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Thermal Stability of Nanocrystalline AZ31/TiB2 Magnesium Matrix Composites Prepared via Mechanical Milling.
- Source :
- Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ); 7/1/2022, Vol. 47 Issue 7, p8373-8383, 11p
- Publication Year :
- 2022
-
Abstract
- In this work, the thermal stability of nanocrystalline (NC) AZ31/TiB<subscript>2</subscript> magnesium matrix composites was investigated, while the microstructure evolution and mechanical properties were analyzed. The results indicated the AZ31/TiB<subscript>2</subscript> still maintained NC structure after annealing at 350 °C for 180 min. Even at the high annealing temperature of 400 °C and 450 °C for 180 min, their average grain size just reached about 124 nm and 155 nm, indicating excellent thermal stability. The TiB<subscript>2</subscript> particles with sub-micron size uniformly distributed in Mg matrix had no change in size and no reaction with matrix during the annealing treatment. Due to the strong Zener pinning effect of TiB<subscript>2</subscript> particles, the grain growth of Mg matrix at high temperature was effectively inhibited. Meanwhile, the solution and precipitation behavior of Al atoms were completed in a short time, due to the existence of many grain boundaries and structural defects. By calculation, the grain growth kinetics was described by the kinetics equation D 8 - D 0 8 = k t and the activation energy E<subscript>g</subscript> for grain growth was 131.6 kJ/mol, which was much higher than that of pure Mg (92 kJ/mol). Due to their excellent thermal stability, the decrease in both compressive yield strength and ultimate compressive strength was no more than 12.2% after annealing treatment. Even annealing at 450 °C for 180 min, the CYS and UCS of the samples were still above 283 MPa and 295 MPa, respectively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 2193567X
- Volume :
- 47
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. )
- Publication Type :
- Academic Journal
- Accession number :
- 159101728
- Full Text :
- https://doi.org/10.1007/s13369-021-06284-1