原位自生TiCp/6061复合材料的组织、硬度及耐磨性能

doi:10.11896/cldb.18100185

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Abstract In-situ TiC particle reinforced 6061 aluminum matrix composites were manufactured by contact reaction. Phase analysis and microstructure observation of the in-situ TiCp/6061 composites were conducted by XRD and SEM, respectively. Taking the 6061 aluminum alloy matrix as comparison, the impact of the mass fraction of reinforcing particles on hardness, friction and wear behavior of the in-situ TiCp/6061 composites was explored. The contact reaction was carried out with Ti powder, C powder and Al powder as raw materials, the direct and in-situ formation of TiC particles could be achieved in 6061 aluminum alloy. The in-situ formed TiC particles presented regular polygons with a size of 0.5—1 μm. The increase of TiC particle content would give rise to a notable improvement in hardness of in-situ TiCp/6061 composites. After heat treatment of T6, the hardness of 5wt% TiCp/6061 composites reached 120.5HBS, 28.1% higher than that of 6061 aluminum alloy, which might be attributed to the combined action of dislocation strengthening and fine grain strengthening of the in-situ formed TiC particles on 6061 matrix materials. Meanwhile, the growing mass content of TiC particles would also bring about the enhancement in wear resistance of in-situ TiCp/6061 compo-sites. After heat treatment of T6, and grinding with GCR15 under constant pressures of 100 N for 300 s, the mass loss of matrix 6061 aluminum alloy was twice of that of the 5wt% TiCp/6061 composite. The reason of this phenomenon is that the increase of TiC particles content lead to the reduction of the effective contact area between the grinding material and the composites, thus the in-situ TiCp/6061 composites with higher TiC particle mass content perform satisfactory wear resistance.

Key words： in-situ formation TiCp/6061 composites microstructure friction and wear

Published: 16 September 2019

CLC number:

TB331

Fund:This work was financially supported by the National Natural Science Foundation Youth Fund of China (516010850), Liaoning Natural Science Foundation (20180551116).

About author:: Weibin Zhuangreceived his Ph.D. degree in mate-rials science from the Northeastern University in October 2013. And then, he works in Liaoning Technical University as a lecture. He has published 8 journal papers as the first author, applied four national invention patents. His research interests focus on the processing and properties of metals matrix composites. He has held on the Liaoning Provincial Natural Science Foundation and the Liaoning doctoral research fund, respectively.
Yuejun Sunobtained his Ph.D. degree in materials science from the Beihang University in Janurary 2009. He now works in Liaoning Technical University as a professor and master’s guide. His research interests focus on the strengthening and toughening mechanism and application of aluminum alloys. He has published more than 50 journal papers as the first author.

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	ZHUANG Weibin
	TIAN Zongwei
	LIU Guangzhu
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Cite this article:

ZHUANG Weibin,TIAN Zongwei,LIU Guangzhu, et al. Microstructure, Hardness and Wear Resistance Properties of In-situ TiCp/6061 Composites[J]. Materials Reports, 2019, 33(22): 3762-3767.

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http://www.mater-rep.com/EN/10.11896/cldb.18100185 OR http://www.mater-rep.com/EN/Y2019/V33/I22/3762

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