Investigation of wear properties of Al6061 alloy and composite containing CNT produced by mechanical alloying and hot pressing process

Subject Areas : journal of New Materials

mahdi omidi ¹ , saeid nategh ² , Arash Etemad ³ , mohammad reza rostami ⁴ , mohammad esmaeil shafiei ⁵

1 - Isalmic azad university of Najafabad branch
2 - islamic azad university of science and research
3 - university of isfahan
4 - Iran science and technology university
5 - IAUN

Received: 2017-12-30 Accepted : 2018-10-07 Published : 2018-09-23

Keywords: composite, Wear, Al6061 alloy, CNT, hot pressed,

Abstract :

In this study, nanostructured aluminum alloy and aluminum base composites containing different amounts of carbon nanotubes (0.5-1.5wt.%) were produced by a combination of mechanical alloying and hot press. Experimental results have shown that the addition of carbon nanotubes up to 1wt. % slightly increase the relative density of aluminum-carbon nanotube composites. However, the hardness of composite increased significantly with increasing carbon nanotubes, Because of the placement of carbon nanotubes in the free space between the powder particles and the filling of the micro-cavities. The hardness value from 93.3 HV to the coarse-grained aluminum reached 219.18 HV. The higher amounts of carbon nanotubes reduced the composite hardness and relative density. The wear behavior of aluminum composites containing carbon nanotubes was investigated by pin on disk method. The results showed that the addition of carbon nanotubes up to 1wt. % into the composite reduced the friction coefficientand weight loss. The amount of friction coefficient of the coarse-grained aluminum in the range (0.33-0.91) and for the specimen containing 1 wt%, the steady state friction coefficient changed in the range (0.42-0.45). Meanwhile, increasing the amount of it, due to the agglomerate phenomenon, increases the friction coefficientand weight loss of the aluminum composite. The results of wear tests for coarse-grained, nanostructured and aluminum composite containing 1 wt.% carbon nanotubes showed that the wear mechanism was adhesive, delamination and abrasive, respectively.

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