ND增强镁基复合材料的热膨胀性能研究

ND增强镁基复合材料的热膨胀性能研究

郑鸿珊¹，张军伟²，马鸿斌^1*，彭  勇^2*

(1.青海大学 高性能轻金属合金与成形工程研究中心，青海省新型轻合金重点实验室，青海 西宁810016；2.兰州大学 物理科学与技术学院，甘肃 兰州73000）

摘  要   镁及镁合金由于其高比强度、比刚度、质量轻以及可回收利用等优点，而成为结构金属中广泛研究的重要材料。纯镁具有较高的导热系数，对镁及镁合金导热性能的研究有助于其在轻量化导热领域中的应用。本文通过粉末冶金的方法制备了不同添加量的纳米金刚石增强镁基复合材料，利用TEM、热膨胀仪等研究了其微观组织对热膨胀性能的影响。结果表明，纳米金刚石的加入可显著地细化镁基体合金晶粒，同时有效地降低其热膨胀系数，材料的尺寸稳定性得到改善。

关键词   镁基复合材料；纳米金刚石；热膨胀系数

中图分类号：TB331；TG115.21⁺5.3   文献标识码：A      doi:10.3969/j.issn.1000-6281.2020.04.002

Study of the thermal expansion performance of ND enhanced magnesium matrix composites

ZHENG Hong-shan¹，ZHANG Jun-wei²，MA Hong-bin¹*，PENG Yong²*

(1.Qinghai Provincial Key Laboratory of New Light Alloys, Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University, Xining Qinghai 810016；Key Laboratory of Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou Gansu 730000, China)

Abstract   Magnesium and magnesium alloys havebeen extensively studied in structural metals due to their advantages of high strength, ratio stiffness, lightness, recoverable utilization and so on. At the same time, pure magnesium has a high thermal conductivity coefficient, and the research of the thermal performance of magnesium and magnesium alloys can be helpful to their applications in the field of thermal conduction. In this paper, the composites of nano-diamond reinforced magnesium matrix are prepared by powder metallurgy, and the effect of microstructure on thermal expansion performance is studied by using TEM and thermal expansion instrument. The results show that the addition of nano-diamond can significantly refine the grains of magnesium matrix alloys, effectively reduce the thermal expansion coefficient and improve the size stability of the material.

Keywords   magnesium composite; nano-diamond; coefficient of thermal expansion

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