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Materials 2017, 10(12), 1385; doi:10.3390/ma10121385

The Effects of Carbon Nanotubes on the Mechanical and Wear Properties of AZ31 Alloy

Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Chengdu 610031, China
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Author to whom correspondence should be addressed.
Received: 24 October 2017 / Revised: 29 November 2017 / Accepted: 1 December 2017 / Published: 4 December 2017
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Carbon nanotube (CNT)-reinforced AZ31 matrix nanocomposites were successfully fabricated using a powder metallurgy method followed by hot extrusion. The influence of CNTs on microstructures, mechanical properties, and wear properties were systematically investigated by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD), hardness test, tensile test, and wear test. The results revealed that the nanocomposites showed a slightly smaller grain size compared with the matrix and uniform distribution that CNTs could achieve at proper content. As a result, the addition of CNTs could weaken basal plane texture. However, the yield strength and ultimate tensile strength of the composites were enhanced as the amount of CNTs increased up to 2.0 wt. %, reaching maximum values of 241 MPa (+28.2%) and 297 MPa (+6.1%), respectively. The load transfer mechanism, Orowan mechanism, and thermal mismatch mechanism played important roles in the enhancement of the yield strength, and several classical models were employed to predict the theoretical values. The effect of CNT content on the friction coefficient and weight loss of the nanocomposites was also studied. The relationships between the amount of CNTs, the friction coefficient, and weight loss could be described by the exponential decay model and the Boltzmann model, respectively. View Full-Text
Keywords: carbon nanotube; metal matrix nanocomposites; texture; strengthening mechanisms; wear behavior carbon nanotube; metal matrix nanocomposites; texture; strengthening mechanisms; wear behavior

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhou, M.; Qu, X.; Ren, L.; Fan, L.; Zhang, Y.; Guo, Y.; Quan, G.; Tang, Q.; Liu, B.; Sun, H. The Effects of Carbon Nanotubes on the Mechanical and Wear Properties of AZ31 Alloy. Materials 2017, 10, 1385.

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