Microstructure and Mechanical Properties of Al2O3p/AZ91 Magnesium Matrix Laminated Material Adjusted by Freezing Temperature

doi:10.1007/s40195-024-01717-w

Abstract

Abstract:

The Al₂O₃ laminated preforms with different layers thickness were prepared by freezing casting in present work. Then, the Al₂O_3p/AZ91 magnesium matrix laminated materials were obtained by infiltrating the AZ91 alloy melt into the Al₂O₃ laminated preform based on pressure infiltration process. Subsequently, the influence of freezing temperature on the microstructure, mechanical properties and fracture behavior of magnesium-based laminates was investigated. The results indicated that with the decrease of freezing temperature, the thickness of Al₂O₃ layers decreases gradually, the number of layers increases obviously, and the interlayers spacing decreases. Accompanied with the decrease of interlayers spacing, the size of Mg₁₇Al₁₂ phase precipitated in the AZ91 alloy layers was refined, and the compression strength and strain were both improved obviously. The micro-cracks initiated in Al₂O₃ layers during loading process, while the AZ91 layers could effectively suppress the initiation and propagation of micro-cracks. Furthermore, the changing layers structure influenced by the decrease of freezing temperature had significant inhibiting effect on the initiation and propagation of micro-cracks, which endowed the Al₂O_3p/AZ91 magnesium matrix laminated materials with better strength and toughness. Notably, the best compression properties of Al₂O_3p/AZ91 magnesium matrix laminated materials could be obtained at the freezing temperature of − 50 °C, the compression strength and elastic modulus of which were the 160% and 250% of monolithic AZ91 alloy, respectively.

Key words: Bio-inspired composites, Freeze-casting, Mechanical properties, Metal matrix composites

Ze-Xin Bai, Kun-Kun Deng, Ze-Qi Du, Kai-Bo Nie, Chao Xu, Quan-Xin Shi. Microstructure and Mechanical Properties of Al₂O_3p/AZ91 Magnesium Matrix Laminated Material Adjusted by Freezing Temperature[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(11): 1819-1829.

Figures/Tables 9

Table 1 Chemical composition of commercial AZ91 magnesium alloy

Al	Zn	Mn	Fe	Si	Cu	Ni	Mg
8.500	0.800	0.300	0.004	0.050	0.025	0.010	Bal.

Fig. 1 a-c SEM images of the composites at − 20 °C, − 30 °C, and − 50 °C, respectively, viewed parallel to the freezing direction; d the statistical chart of the average wavelength and wall thickness of the composites at different freezing rates

Fig. 2 a-c SEM images of the longitudinal section of the composite at − 30 °C and its surface scan

Fig. 3 XRD images at different freezing temperatures

Fig. 4 Microscopic morphologies and phase size statistical charts of the composites under different freezing temperatures: a, d at − 20 °C, b, e at − 30 °C, c, f at − 50 °C

Fig. 5 Longitudinal section of the composites at different freezing temperatures: a compression stress-strain curve, b compressive stress-strain and elastic modulus bar graph

Fig. 6 Compression stress-strain curve of the Al2O3 preform at different freezing temperatures

Fig. 7 Fracture morphologies of the composites a-c at − 20 °C, d-f at − 30 °C, g-i at − 50 °C

Fig. 8 a-c Schematic diagrams of the fracture mechanisms within the composite layers at − 20 °C, − 30 °C, and − 50 °C. d-f Visual representation of the crack initiation and propagation in the composites

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Microstructure and Mechanical Properties of Al₂O_3p/AZ91 Magnesium Matrix Laminated Material Adjusted by Freezing Temperature

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