High Press Torsion of Carbon Nanotubes-Copper Nanocomposites
In recent years,processing of materials through severe plastic deformation (SPD) has been developed as a new method to manufacture bulk specimens of ultrafine/nanocrystalline grained structures.In the current investigation,bulk nanocomposites of carbon nanotube (CNT) reinforced copper were synthesized from mixtures of coarse grained copper powders and CNTs of various volume fractions (2.5 vol.%,5 vol.% and 10 vol.%) using one of the highly effective SPD methods: high pressure torsion (HPT).Microstructural features such as grain refinements,orientations,misorientation angles,and their distributions were investigated using electron backscatter diffraction of a field emission scanning electron microscope.Bulk nanocomposites to near theoretical densities were successfully produced through high pressure torsion technique and the effect of the volume fraction of CNTs on microstructural evolutions is emphasized.Electron backscatter diffraction showed that the grain size was reduced to ~60 nm and high angle grain boundaries (misorientation angle >15°) are dominant after the HPT process for all samples.
Severe plastic deformation High pressure torsion Metal matrix nanocomposites Carbon nanotubes
Eun Yoo Yoon Hyoung Seop Kim
Department of Materials Science and Engineering, Pohang University of Science and Technology(POSTECH),Pohang, 790-784, Korea
国际会议
第五届亚洲微纳成形技术研讨会(AMMFT2012)暨第三届微纳成形学术委员会会议
哈尔滨
英文
29-32
2012-08-01（万方平台首次上网日期，不代表论文的发表时间）