Microstructure and Wear Behaviors of In-situ Al-7Si/TiB<sub>2</sub> Composites

Zhang Lei1; Tan Yanjun1; Yao Junping1

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Microstructure and Wear Behaviors of In-situ Al-7Si/TiB₂ Composites
Vol. 29, Issue 10, Pages: 975-978(2009)
Published： 2009 ，
DOI：

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[1]张磊,谭燕军,尧军平.原位合成TiB_2/Al-7Si复合材料的微观组织及摩擦磨损行为[J].特种铸造及有色合金,2009,29(10):975-978+882.

Zhang Lei1, Tan Yanjun1, Yao Junping1. Microstructure and Wear Behaviors of In-situ Al-7Si/TiB₂ Composites. [J]. Special Casting & Nonferrous Alloys 29(10):975-978(2009)
[1]张磊,谭燕军,尧军平.原位合成TiB_2/Al-7Si复合材料的微观组织及摩擦磨损行为[J].特种铸造及有色合金,2009,29(10):975-978+882. DOI：

Zhang Lei1, Tan Yanjun1, Yao Junping1. Microstructure and Wear Behaviors of In-situ Al-7Si/TiB₂ Composites. [J]. Special Casting & Nonferrous Alloys 29(10):975-978(2009) DOI：

摘要

采用混合盐反应工艺制备了TiB2/Al-7Si铝基复合材料

通过XRD、SEM、EDS和摩擦磨损试验等材料分析方法测试了所合成的复合材料的微观组织和耐磨性能。研究表明

内生TiB2颗粒分布均匀

平均尺寸约为400nm。TiB2颗粒对α-Al和共晶Si都具有显著的细化效果。复合材料的耐磨性能比基体合金有明显的提高

原因是表面形成了一层致密的机械混合层。TiB2颗粒在摩擦过程中起着抑制金属流动和支撑的双重作用。

Abstract

In-situ Al-7Si/TiB2 composites were synthesized by mixed salt reaction method. The microstructure and wear behavior of the prepared composites were analyzed by XRD （X-ray diffraction）

SEM （scanning electron microscope） and EDS（ energy dispersive spectrometer） as well as wear-friction testing. The results reveal that in-situ TiB2 particle with average size of approximately 400 nm is uniformly distributed in the matrix

which exhibits desirable refining effects on primary Al phase and eutectic Si phase. The wear behavior of the composites is greatly superior to that of the matrix

which is attributed to the formation of a compact mechanical mixture layer on the surface of the composites. In addition

TiB2 particles exhibit coupling effects of inhibiting metal flow and bearing some load in process of friction.