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

Jie Chen¹，Chong-Gao Bao²，Zhi-Wei Liu²，Ben-Shuang Sun¹，Yong-Chun Shu¹，Qing-Kui Li¹

1. Henan Province Industrial Technology Research Institute of Resources and Materials,Zhengzhou University2. State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University

摘 要：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 Al N particles.The microstructure,thermal diffusivity and thermal expansion of the Mg–Al/Al N composites using different mixing methods were investigated.The results showed that the intergranular and intragranular distributions of Al N 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 Al N 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/Al N composites.

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