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本文探讨了用粉末冶金法,采用常规的冶金加工设备和工艺,制造Al_2O_3颗粒增强纯铝基复合材料的可行性。研究了不同Al_tO_3体积含量复合材料的显微组织及力学性能。初步试验了二次热挤压变形对颗粒分布和对基体强化的影响。结果表明,Al_2O_3颗粒与纯铝粉混合,加压烧结制备的复合材料,组织致密,颗粒分布均匀,随Al_2O_3含量增加,复合材料强度、硬度及弹性模量大大提高,Al_2O_3含量小于10％时,塑性不降低。二次热挤压有助于提高颗粒分布的均匀性;并使基体显著强化。
This article discusses the feasibility of using powder metallurgy method, using conventional metallurgical processing equipment and processes to make Al 2 O 3 particles reinforced pure aluminum matrix composites. The microstructure and mechanical properties of different Al_tO_3 composites were studied. The effects of secondary hot extrusion deformation on the particle distribution and matrix strengthening were preliminary tested. The results show that the composites prepared by mixing Al 2 O 3 particles and pure aluminum powder have the advantages of compact structure and uniform particle distribution. With the increase of Al 2 O 3 content, the strength, hardness and elastic modulus of the composites increase greatly. When the content of Al 2 O 3 is less than 10% Plasticity does not decrease. Secondary hot extrusion helps to improve the uniformity of the particle distribution; and significantly reinforces the matrix.