Thermal Properties of Mg-Al/AlN Composites Fabricated by Powder Metallurgy

doi:10.1007/s40195-017-0689-x

Abstract

Abstract:

Magnesium matrix composites reinforced with AlN particles were fabricated by the powder metallurgy technique. Different mixing methods were used in this study to control the distribution of AlN particles. The microstructure, thermal diffusivity and thermal expansion of the Mg-Al/AlN composites using different mixing methods were investigated. The results showed that the intergranular and intragranular distributions of AlN particles were obtained, respectively, by controlling the mixing methods. The composite with intragranular particles exhibited lower thermal diffusivity because of the existences of more interfaces, defects and grain boundaries, which acted as scattering centers and reduced the mean free path of electrons and phonons. The existence of AlN particles lowered the coefficient of thermal expansion (CTE) and enhanced the dimensional stability of the composites. And the use of the improved mixing method further reduced the CTE of Mg-Al/AlN composites.

Key words: Magnesium matrix composite, Microstructure, Thermal diffusivity, Thermal expansion, Mixing

Jie Chen, Chong-Gao Bao, Zhi-Wei Liu, Ben-Shuang Sun, Yong-Chun Shu, Qing-Kui Li. Thermal Properties of Mg-Al/AlN Composites Fabricated by Powder Metallurgy[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(6): 641-649.

Figures/Tables 9

Fig. 1 Preparation process of Mg-Al/AlN composites

Fig. 2 Microstructures of Mg-Al/AlN composites in cross section a, c and longitudinal section b, d by using conventional a, b, improved c, d mixing method

Fig. 3 Optical micrographs of Mg-Al/AlN composites in cross section a, c and longitudinal section b, d by using conventional a, b, improved c, d mixing method

Fig. 4 Microstructures of recrystallization grains of Mg-Al/AlN composites using conventional a, improved b mixing method

Fig. 5 Microstructures of commercial Mg-Al alloy in cross section a, longitudinal section b

Fig. 6 Thermal diffusivities as a function of temperature for commercial Mg-Al alloy and Mg-Al/AlN composites using different mixing methods

Fig. 7 Thermal conductivities as a function of temperature for commercial Mg-Al alloy and Mg-Al/AlN composites using different mixing methods

Fig. 8 XRD patterns before and after measuring thermal diffusivity: a commercial Mg-Al alloy; b Mg-Al/AlN composite using conventional mixing method; c Mg-Al/AlN composite using improved mixing method

Fig. 9 Temperature dependence of relative elongation a and CTE b for commercial Mg-Al: alloy and Mg-Al/AlN composites using different mixing methods

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