Effect of CNT Contents on the Microstructure and Properties of CNT/TiMg Composites

被引:6
|
作者
Yuan, Xiaomin [1 ]
Zhu, Haonan [1 ]
Ji, Huiling [2 ]
Zhang, Yiwei [1 ]
机构
[1] Anhui Univ Technol, Sch Mat Sci & Engn, Maanshan 243002, Peoples R China
[2] Anhui Univ Technol, Dept Mech Engn Ind & Commercial, Dangtu 243100, Peoples R China
来源
MATERIALS | 2019年 / 12卷 / 10期
关键词
carbon nanotubes; MgH2; hot pressing sintering; Ti-Mg alloy; TRIBOLOGICAL PROPERTIES; MECHANICAL-PROPERTIES; POWDER-METALLURGY; CARBON NANOTUBES; MG;
D O I
10.3390/ma12101620
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Carbon nanotubes (CNTs), dispersed in absolute ethanol, were evenly mixed into Ti/MgH2 powders by wet milling. Then, we applied the vacuum hot-pressed sinteringmethod to the CNTs/TiMg composite materials. An optical microscope (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and a field emission scanning electron microscope (FESEM) were used for the microstructure observation and phase analysis of samples. The mechanical properties were measured via the micro-vickers hardness. The results show that the main phases in the composites were Ti, Mg and C. Meanwhile, a small amount of Ti-Mg solid solution phase was also found. The cross-section morphology of the composites shows that the melted magnesium fills the grain interface during extrusion and that the composites have a better compactness.The microstructures of the composites have been greatly refined as the CNT contents increased. The structure of the composites was further refined when 0.5 wt.% CNTs were added. The fracture surface is obviously a ductile fracture. The microhardness increases obviously with the CNT content increasing. When the content of the CNTs is 1.0 wt.%, the microhardness of the composites reaches 232 HV, which is 24% higher than that of the matrix.
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页数:9
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