Cu-Al<sub>2</sub>O<sub>3</sub>复合粉末颗粒原位生成机制探究

doi:10.11896/cldb.18050223

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Abstract Cu-Al₂O₃ composite powder was obtained by ball milling, using Cu-Al alloy powder and CuO powder as the raw materials. The effect of milling time on powder particles’ morphology, size, phase, crystalline size and internal strains were observed and analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD) and transmission electron microscope (TEM), etc. Meanwhile, powder microstructure evolution during ball milling was investigated, and the in-situ formation mechanism of Al₂O₃ nanoparticles was revealed. The result showed that the final product of ball milling was Cu and Al₂O₃.The process of in-situ formation of Al₂O₃ nanoparticles is controlled by diffusion. With the increase of milling time, the powder particles shape changed from ellipsoid to laminar and equiaxial, particle size first increased and then decreased, interlamellar spacing decreased continuously, the powder grains refined and the internal strain increased gradually. These changes provide a fast-track for atom diffusion. At the same time, the CuO particles in Cu-Al alloy powder formed numerous diffusion-reaction couples to reduce the reaction activation energy and promote the in-situ formation of Al₂O₃ nanoparticles.

Key words： Cu-Al₂O₃ reaction ball milling powder microstructure evolution in-situ formation mechanism of particles

Published: 25 April 2020

CLC number:

TB333

Fund:This work was financially supported by the Beijing Natural Science Foundation (2152031).

About author:: Guimin Liureceived his Ph.D. degree in materials from Warsaw University of Technology. He is currently a professor in Army Academy of Armored Forces and participates in the development of metal matrix compo-sites, surface engineering and material failure analysis.
Linfei Dureceived his master’s degree of engineering in December 2018 from Army Academy of Armored Forces, focusing on the research of copper matrix composites.

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	LIU Guimin
	DU Linfei
	YAN Tao
	HUI Yang

Cite this article:

LIU Guimin,DU Linfei,YAN Tao, et al. Study on In-situ Formation Mechanism of Cu-Al₂O₃ Composite Powder[J]. Materials Reports, 2020, 34(8): 8031-8035.

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http://www.mater-rep.com/EN/10.11896/cldb.18050223 OR http://www.mater-rep.com/EN/Y2020/V34/I8/8031

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