Microstructure and mechanical properties of carbon nanotubes reinforced aluminum matrix composites synthesized via equal-channel angular pressing

作者：Zare Hassan; Jahedi Mohammad; Toroghinejad Mohammad Reza; Meratian Mahmoud; Knezevic Marko

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2016, 670: 205-216.

DOI：10.1016/j.msea.2016.06.027

• Metal matrix composites
• Powder processing
• Severe plastic deformation
• Particle distribution
• Consolidation

In this work, 2 vol% carbon nanotubes (CNTs) reinforced aluminum (Al) matrix composites of superior microstructural homogeneity are successfully synthesized using Bc equal-channel angular extrusion (ECAP) route. The key step in arriving at high level of homogeneous distribution of CNTs within Al was preparation of the powder using simultaneous attrition milling and ultra-sonication processes. Microstructure as revealed by electron microscopy and absence of Vickers hardness gradients across the material demonstrate that the material reached the homogeneous state in terms of CNT distribution, porosity distribution, and grain structure after eight ECAP passes. To facilitate comparison of microstructure and hardness, samples of Al were processed under the same ECAP conditions. Significantly, the composite containing only 2 vol% exhibits 20% increase in hardness relative to the Al samples.

• 出版日期2016-7-18